Conveying belt and preparation method thereof

Abstract

The invention provides a conveying belt and a preparation method thereof. According to the impact-resistant multi-layer glass fiber cloth reinforced conveying belt, glass fibers of a warp and weft net-shaped structure are adopted as a framework material of the conveying belt and subjected to specific gum dipping treatment, meanwhile, two layers of foaming bodies are specially introduced, and the composition of the foaming impact-resistant layer is reasonably designed; compared with a traditional steel wire rope core and fabric core conveying belt, the steel wire rope core and fabric core conveying belt is lighter in mass, higher in mechanical tensile strength, more uniform in stress and capable of effectively absorbing impact energy from the outside and improving the impact resistance. In addition, the used reinforcement body is glass fiber cloth which is non-combustible, so that the flame retardance of the conveying belt can be improved; due to the introduction of the foaming body, the weight of the foaming body is lighter than that of the rubber body with the same thickness, so that the lightweight effect can be achieved; besides, the reinforcing body is an inorganic material, and the expansion and contraction rate is lower than that of polyester cloth, nylon cloth, aramid fiber cloth and the like when the reinforcing body is heated, so that the thermal stability of the conveying belt is improved.

Description

Technical Field

[0001] This invention relates to the field of conveyor belt technology, and in particular to a conveyor belt and its manufacturing method. Background Technology

[0002] Conveyor belts, also known as transport belts, are composite products used to carry and transport materials. They are widely used in industries such as cement, metallurgy, chemicals, and steel.

[0003] The core reinforcement materials used in existing conveyor belts are mainly polyester, aramid, vinylon, nylon, and steel wire rope. Among them, aramid fiber has the best performance, but it is expensive and has a low market share. Polyester, vinylon, and nylon are relatively inexpensive, but their performance is correspondingly lower. Steel wire rope has high strength, but for the same specifications, it is heavy and has a high installation cost. Moreover, the impact resistance of current conveyor belts is generally poor. Summary of the Invention

[0004] In view of this, the present invention provides a conveyor belt and a method for manufacturing the same. The conveyor belt provided by the present invention can effectively improve impact resistance.

[0005] This invention provides a conveyor belt, comprising:

[0006] Fiberglass cloth reinforced composite layer 1;

[0007] The upper surface of the glass fiber reinforced composite layer 1 is laminated with an upper foamed impact-resistant layer 2a; the width of the upper foamed impact-resistant layer 2a is the same as the width of the glass fiber reinforced composite layer 1, and the length of the upper foamed impact-resistant layer 2a is less than the length of the glass fiber reinforced composite layer 1; and the areas on the upper surface of the glass fiber reinforced composite layer 1 exposed at both ends of the upper foamed impact-resistant layer 2a in the length direction are provided with upper head and tail adhesive 3a to seal the two ends of the upper foamed impact-resistant layer 2a.

[0008] The lower surface of the glass fiber reinforced composite layer 1 is laminated with a lower foamed impact-resistant layer 2b; the width of the lower foamed impact-resistant layer 2b is the same as the width of the glass fiber reinforced composite layer 1, and the length of the lower foamed impact-resistant layer 2b is less than the length of the glass fiber reinforced composite layer 1; and the area on the lower surface of the glass fiber reinforced composite layer 1 exposed at both ends of the lower foamed impact-resistant layer 2b in the length direction is provided with a lower end adhesive 3b to seal the two ends of the lower foamed impact-resistant layer 2b.

[0009] The surface of the upper foamed impact-resistant layer 2a is coated with an upper cover adhesive layer 4a; and the length of the upper cover adhesive layer 4a is the same as the length of the glass fiber cloth reinforced composite layer 1, and the width of the upper cover adhesive layer 4a is the same as the width of the glass fiber cloth reinforced composite layer 1.

[0010] The surface of the lower foamed impact-resistant layer 2b is coated with a lower cover adhesive layer 4b; and the length of the lower cover adhesive layer 4b is the same as the length of the glass fiber cloth reinforced composite layer 1, and the width of the lower cover adhesive layer 4b is the same as the width of the glass fiber cloth reinforced composite layer 1.

[0011] The upper cover adhesive layer 4a and the lower cover adhesive layer 4b are sealed with edge sealing adhesive 5 on both sides in the width direction.

[0012] in:

[0013] The glass fiber cloth reinforced composite layer 1 includes several layers of glass fiber cloth reinforcement;

[0014] The glass fiber cloth reinforcement layer is obtained by the following method: impregnating glass fiber cloth with resin to obtain the glass fiber cloth reinforcement layer;

[0015] The adhesive solution used in the impregnation process comprises the following components in parts by weight:

[0016] Main materials: 80-100 copies;

[0017] Solvent: 100~500 parts;

[0018] Adhesive: 2-10 parts;

[0019] Silane coupling agent: 1-3 parts;

[0020] Stearic acid: 1-2 parts;

[0021] Accelerator: 3-6 parts;

[0022] Vulcanizing agent: 1-4 parts;

[0023] The main material is two or more of the following: natural rubber, styrene-butadiene rubber, cis-butadiene rubber, and carboxyl-terminated nitrile rubber.

[0024] Preferably, the raw materials for preparing the upper foamed impact-resistant layer 2a include:

[0025] POE-g-MAH: 10~50 parts;

[0026] EVA resin: 50-90 parts;

[0027] Foaming agent: 1-5 parts;

[0028] NaHCO3: 0.5~2 parts;

[0029] Stearic acid: 1-4 parts;

[0030] Zinc oxide: 2-4 parts;

[0031] Silane coupling agent: 1-5 parts;

[0032] Nano-calcium carbonate: 0.5~3 parts;

[0033] Crosslinking agent: 1-3 parts;

[0034] Antioxidant: 0.1~1 part.

[0035] Preferably, the POE-g-MAH is prepared by the following method:

[0036] K1. The POE resin particles are swollen by contacting them with a solvent, then washed and dried to obtain swollen POE particles.

[0037] K2. Mix the swollen POE particles, maleic anhydride, zinc stearate, calcium stearate, and solvent to obtain a mixture;

[0038] K3. The mixture is mixed with an initiator and heated to react, yielding POE-g-MAH.

[0039] Preferably, in step K1, the solvent is cyclohexane;

[0040] Step K1 specifically includes: spraying solvent onto the surface of POE resin particles while stirring, then spreading the wetted POE particles on a tray and allowing them to swell; then washing and drying to obtain swollen POE particles; wherein the temperature for the static swelling is 0~10℃ and the time is 2~4h.

[0041] Preferably, in step K2:

[0042] The solvent is a mixture of n-heptane and ethyl acetate; the volume ratio of n-heptane to ethyl acetate is 8:2.

[0043] The amounts of each substance are as follows: 100 parts of swollen POE granules, 1-5 parts of maleic anhydride, 0.5-2 parts of zinc stearate, 0.5-2 parts of calcium stearate, and 300 parts of solvent.

[0044] In step K3:

[0045] The initiator is AIBN;

[0046] Based on 100 parts by mass of swollen POE particles used in step K2, the amount of the initiator is 0.5 to 2 parts;

[0047] The heating reaction is carried out at a temperature of 80-90°C for 2-4 hours.

[0048] Preferably, the preparation method of the upper foamed impact-resistant layer 2a includes: adding POE-g-MAH, EVA resin, stearic acid, zinc oxide, antioxidant, nano calcium carbonate, NaHCO3 and silane coupling agent into a mixer for mixing, then adding a crosslinking agent for further mixing, and finally adding a foaming agent for mixing, extruding, calendering and molding into a sheet to obtain the upper foamed impact-resistant layer.

[0049] Preferably, the material of the lower foamed impact-resistant layer 2b is the same as that of the upper foamed impact-resistant layer 2a.

[0050] Preferably, the raw materials for the head and tail adhesive 3a include:

[0051] Natural gum: 50-80 parts;

[0052] Styrene-butadiene rubber: 20-50 parts;

[0053] Carbon black: 20-50 parts;

[0054] Coumarone resin: 2-8 parts;

[0055] Zinc oxide: 1-3 parts;

[0056] Stearic acid: 1-2 parts;

[0057] Anti-aging agent: 0.5~2 parts;

[0058] Accelerator: 1-3 parts;

[0059] Sulfur: 1-2 parts;

[0060] The preparation method of the top and bottom rubber 3a includes: mixing natural rubber, styrene-butadiene rubber, carbon black, coumarone resin, zinc oxide, stearic acid, antioxidant and accelerator evenly in an internal mixer, then adding sulfur, mixing again, discharging the rubber, letting it stand, calendering and extruding it into sheets to obtain the rubber compound.

[0061] The material of the lower head and tail adhesive 3b is the same as that of the upper head and tail adhesive 3a;

[0062] The material of the upper cover adhesive layer 4a is the same as that of the upper head and tail adhesive 3a;

[0063] The material of the lower cover adhesive layer 4b is the same as that of the upper head and tail adhesive 3a;

[0064] The edge sealing adhesive 5 is made of the same material as the top and bottom adhesive 3a.

[0065] The present invention also provides a method for preparing the conveyor belt described in the above technical solution, comprising: combining a glass fiber cloth reinforced composite layer 1, an upper foamed impact-resistant layer 2a, a lower foamed impact-resistant layer 2b, an upper cover rubber layer 4a, and a lower cover rubber layer 4b together to form a belt blank; placing the belt blank into a mold frame; molding and vulcanizing it in a vulcanizing flat plate machine; then bonding the upper head and tail rubber 3a, the lower head and tail rubber 3b, and the edge sealing rubber 5 together with the vulcanized belt blank; and vulcanizing the edges to obtain the conveyor belt.

[0066] Preferably, the compression molding vulcanization process includes: preheating, crosslinking reaction, foaming reaction, and finally pressure holding and shaping.

[0067] The preheating conditions are as follows: temperature 90~110℃, pressure 1~3MPa, time 5~10min; the crosslinking reaction conditions are as follows: temperature 145~155℃, pressure 10~15MPa, time 5~10min; the foaming reaction conditions are as follows: temperature 145~155℃, pressure 5~10MPa, time 10~20min; the pressure holding and shaping conditions are as follows: temperature 145~155℃, pressure 5~10MPa, time 5~10min.

[0068] The conveyor belt provided by this invention is an impact-resistant multi-layer glass fiber reinforced conveyor belt. This invention uses glass fiber with a warp and weft mesh structure as the skeleton material of the conveyor belt and undergoes a specific impregnation treatment. Simultaneously, two layers of foam are specially introduced, and the composition of the foamed impact-resistant layer is rationally designed. This results in a lighter weight, higher tensile strength, and more uniform stress distribution compared to traditional steel cord core and fabric core conveyor belts. It also effectively absorbs impact energy from external sources, improving impact resistance. Furthermore, the reinforcement used is glass fiber cloth, which is non-combustible, increasing the flame retardancy of the conveyor belt. Moreover, due to the introduction of foam, the weight is lighter than that of rubber for the same thickness, thus achieving a lightweight effect. In addition, the reinforcement is an inorganic material, and its shrinkage rate when heated is lower than that of polyester cloth, nylon cloth, and aramid cloth, thus improving the thermal stability of the conveyor belt. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0070] Figure 1 This is a cross-sectional view of the conveyor belt along its length according to the present invention;

[0071] Figure 2This is a cross-sectional view of the conveyor belt in the width direction of the present invention;

[0072] Figure 3 This is a schematic diagram of the upper part of the conveyor belt structure of the present invention. Detailed Implementation

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0074] In this article, the technical features described in an open-ended manner include both closed technical solutions composed of the listed features and open technical solutions that include the listed features.

[0075] The term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0076] In this document, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when a range refers to an integer, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0077] In this article, when referring to units for data ranges, if the unit is only followed by the right endpoint, it indicates that the units for the left and right endpoints are the same. For example, 50~60℃ means that the units for the left endpoint "50" and the right endpoint "60" are both m / s (meters per second).

[0078] This document only specifically discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0079] In a first aspect, the present invention provides a conveyor belt, comprising:

[0080] Fiberglass cloth reinforced composite layer 1;

[0081] The upper surface of the glass fiber reinforced composite layer 1 is laminated with an upper foamed impact-resistant layer 2a; the width of the upper foamed impact-resistant layer 2a is the same as the width of the glass fiber reinforced composite layer 1, and the length of the upper foamed impact-resistant layer 2a is less than the length of the glass fiber reinforced composite layer 1; and the areas on the upper surface of the glass fiber reinforced composite layer 1 exposed at both ends of the upper foamed impact-resistant layer 2a in the length direction are provided with upper head and tail adhesive 3a to seal the two ends of the upper foamed impact-resistant layer 2a.

[0082] The lower surface of the glass fiber reinforced composite layer 1 is laminated with a lower foamed impact-resistant layer 2b; the width of the lower foamed impact-resistant layer 2b is the same as the width of the glass fiber reinforced composite layer 1, and the length of the lower foamed impact-resistant layer 2b is less than the length of the glass fiber reinforced composite layer 1; and the area on the lower surface of the glass fiber reinforced composite layer 1 exposed at both ends of the lower foamed impact-resistant layer 2b in the length direction is provided with a lower end adhesive 3b to seal the two ends of the lower foamed impact-resistant layer 2b.

[0083] The surface of the upper foamed impact-resistant layer 2a is coated with an upper cover adhesive layer 4a; and the length of the upper cover adhesive layer 4a is the same as the length of the glass fiber cloth reinforced composite layer 1, and the width of the upper cover adhesive layer 4a is the same as the width of the glass fiber cloth reinforced composite layer 1.

[0084] The surface of the lower foamed impact-resistant layer 2b is coated with a lower cover adhesive layer 4b; and the length of the lower cover adhesive layer 4b is the same as the length of the glass fiber cloth reinforced composite layer 1, and the width of the lower cover adhesive layer 4b is the same as the width of the glass fiber cloth reinforced composite layer 1.

[0085] The upper cover adhesive layer 4a and the lower cover adhesive layer 4b are sealed with edge sealing adhesive 5 on both sides in the width direction.

[0086] in:

[0087] The glass fiber cloth reinforced composite layer 1 includes several layers of glass fiber cloth reinforcement;

[0088] The glass fiber cloth reinforcement layer is obtained by the following method: impregnating glass fiber cloth with resin to obtain the glass fiber cloth reinforcement layer;

[0089] The adhesive solution used in the impregnation process comprises the following components in parts by weight:

[0090] Main materials: 80-100 copies;

[0091] Solvent: 100~500 parts;

[0092] Adhesive: 2-10 parts;

[0093] Silane coupling agent: 1-3 parts;

[0094] Stearic acid: 1-2 parts;

[0095] Accelerator: 3-6 parts;

[0096] Vulcanizing agent: 1-4 parts;

[0097] The main material is two or more of the following: natural rubber, styrene-butadiene rubber, cis-butadiene rubber, and carboxyl-terminated nitrile rubber.

[0098] like Figure 1-3 As shown, Figure 1 This is a cross-sectional view along the length of the conveyor belt of the present invention. Figure 2 This is a cross-sectional view of the conveyor belt in the width direction of the present invention. Figure 3 This is a schematic diagram of the upper part of the conveyor belt of the present invention; wherein, 1 is a glass fiber cloth reinforced composite layer, 2a is an upper foamed impact-resistant layer, 2b is a lower foamed impact-resistant layer, 3a is an upper head and tail adhesive, 3b is a lower head and tail adhesive, 4a is an upper cover adhesive layer, 4b is a lower cover adhesive layer, and 5 is an edge sealing adhesive.

[0099] Regarding the glass fiber cloth reinforced composite layer 1 :

[0100] According to the present invention, the glass fiber cloth reinforcement layer is obtained by the following method: impregnating glass fiber cloth with resin to obtain the glass fiber cloth reinforcement layer.

[0101] In this invention, preferably, the glass fiber cloth is woven from high-silica glass fiber filaments (SiO2 content > 96%) in a 90° cross-weft pattern. Preferably, the glass fiber cloth has the same density in the transverse (weft) and longitudinal (warp) directions, thereby ensuring equal tensile strength in both directions. In this invention, the sheet areal density of the glass fiber cloth is preferably 500 gsm. In this invention, the glass fiber cloth is preferably modified with a silane coupling agent; its source is not particularly limited and can be any commercially available product.

[0102] In this invention, the adhesive solution used in the impregnation process comprises the following components in parts by weight:

[0103] Main materials: 80-100 copies;

[0104] Solvent: 100~500 parts;

[0105] Adhesive: 2-10 parts;

[0106] Silane coupling agent: 1-3 parts;

[0107] Stearic acid: 1-2 parts;

[0108] Accelerator: 3-6 parts;

[0109] Vulcanizing agent: 1-4 parts.

[0110] The main material is at least two of the following: natural rubber, styrene-butadiene rubber, butadiene rubber, and carboxyl-terminated nitrile rubber, more preferably natural rubber and styrene-butadiene rubber. The natural rubber preferably comprises 30% to 50% of the main material by mass, specifically 30%, 35%, 40%, 45%, and 50%; the styrene-butadiene rubber preferably comprises 50% to 70% of the main material by mass, specifically 50%, 55%, 60%, 65%, and 70%. The amount of the main material used is 80 to 100 parts, specifically 80 parts, 85 parts, 90 parts, 95 parts, and 100 parts.

[0111] The solvent is preferably at least one selected from gasoline, acetone, n-hexane, cyclohexane, toluene, xylene, and turpentine. The amount of the solvent used is 100-500 parts, specifically 100 parts, 210 parts, 300 parts, 400 parts, and 500 parts.

[0112] The adhesive is preferably adhesive RS and adhesive RA. The amount of adhesive RS is 1 to 5 parts, specifically 1 part, 2 parts, 3 parts, 4 parts, or 5 parts. The amount of adhesive RA is 1 to 5 parts, specifically 1 part, 2 parts, 3 parts, 4 parts, or 5 parts. The total amount of adhesive is 2 to 10 parts, specifically 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts.

[0113] The silane coupling agent is preferably at least one of KH550, KH560, KH590, and Si-69. The amount of the silane coupling agent used is 1 to 3 parts, specifically 1 part, 2 parts, or 3 parts.

[0114] The amount of stearic acid used is 1 to 2 parts, specifically 1 part or 2 parts.

[0115] The accelerator is preferably at least one selected from the following: accelerator M (2-mercaptobenzothiazole), accelerator DM (2,2'-dibenzothiazole disulfide), accelerator TMTD (tetramethylthiuram disulfide), accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide), accelerator DZ (N,N-dicyclohexyl-2-benzothiazole sulfenamide), accelerator NOBS (N-oxodiethylidene-2-benzothiazole sulfenamide), and zinc oxide. In this invention, the amount of the accelerator used is 3 to 6 parts, specifically 3 parts, 4 parts, 5 parts, or 6 parts.

[0116] The vulcanizing agent is preferably DCP (dicumyl peroxide). The amount of the vulcanizing agent is 1 to 4 parts, specifically 1 part, 1.5 parts, 2 parts, 3 parts, or 4 parts.

[0117] In this invention, there are no special restrictions on the preparation method of the adhesive solution; it is sufficient to mix all the above components evenly.

[0118] In this invention, preferably, the impregnation process includes: impregnating the glass fiber cloth in the adhesive solution, then using a squeeze roller to squeeze the adhesive solution to fill the mesh structure of the glass fiber cloth, then squeezing out the excess adhesive solution to drain it, and then drying it to obtain the glass fiber cloth reinforcement layer.

[0119] The temperature of the adhesive solution is preferably 50~60℃, specifically 50℃, 51℃, 52℃, 53℃, 54℃, 55℃, 56℃, 57℃, 58℃, 59℃, or 60℃. The immersion time is preferably 3~5 minutes, specifically 3 minutes, 4 minutes, or 5 minutes. The drying temperature is preferably 80~100℃, specifically 80℃, 85℃, 90℃, 95℃, or 100℃; drying continues until the adhesive solution no longer flows out.

[0120] The present invention uses glass fiber cloth modified with silane coupling agent, which can improve the interfacial bonding force between the surface of glass fiber cloth and impregnation liquid. Impregnation treatment of glass fiber cloth can enhance the adhesion between glass fiber cloth and foamed impact-resistant layer 2.

[0121] In this invention, after obtaining a single glass fiber cloth reinforcement layer, several single glass fiber cloth reinforcement layers are stacked and composited to obtain a glass fiber cloth reinforced composite layer. In this invention, the number of glass fiber cloth reinforcement layers is ≥2 layers, more preferably 2 to 5 layers, specifically 2, 3, 4, 5 layers, etc.

[0122] Regarding the upper foamed impact-resistant layer 2a :

[0123] According to the present invention, the upper foamed impact-resistant layer 2a is disposed on the upper surface of the glass fiber cloth reinforced composite layer 1.

[0124] In this invention, the width of the upper foamed impact-resistant layer 2a is the same as the width of the glass fiber cloth reinforced composite layer 1, and the length of the upper foamed impact-resistant layer 2a is less than the length of the glass fiber cloth reinforced composite layer 1 (e.g., Figure 3 (As shown). Preferably, the length of the upper foamed impact-resistant layer 2a is 0.2~0.5m shorter than the length of the glass fiber reinforced composite layer 1. In this invention, the center point of the upper foamed impact-resistant layer 2a is aligned with the center point of the glass fiber reinforced composite layer 1.

[0125] In this invention, the raw materials for preparing the upper foamed impact-resistant layer 2a, by weight, include:

[0126] POE-g-MAH: 10~50 parts;

[0127] EVA resin: 50-90 parts;

[0128] Foaming agent: 1-5 parts;

[0129] NaHCO3: 0.5~2 parts;

[0130] Stearic acid: 1-4 parts;

[0131] Zinc oxide: 2-4 parts;

[0132] Silane coupling agent: 1-5 parts;

[0133] Nano-calcium carbonate: 0.5~3 parts;

[0134] Crosslinking agent: 1-3 parts;

[0135] Antioxidant: 0.1~1 part.

[0136] In this invention, the amount of POE-g-MAH (i.e., maleic anhydride-grafted polyolefin elastomer, maleic anhydride graft of POE) is 10 to 50 parts, specifically 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, and 50 parts.

[0137] The POE-g-MAH can be prepared by the following method:

[0138] K1. The POE resin particles are swollen by contacting them with a solvent, then washed and dried to obtain swollen POE particles.

[0139] K2. Mix the swollen POE particles, maleic anhydride, zinc stearate, calcium stearate, and solvent to obtain a mixture;

[0140] K3. The mixture is mixed with an initiator and heated to react, yielding POE-g-MAH.

[0141] In step K1: the preferred particle size of the POE resin particles is 3-5 mm. The preferred solvent is cyclohexane. The mass ratio of the POE resin particles to the solvent is 100:(10-50), specifically 100:10, 100:20, 100:30, 100:40, 100:50, and more preferably 100:30. Step K1 preferably includes: spraying the solvent onto the surface of the POE resin particles while stirring, then spreading the wetted POE particles evenly on a tray and allowing them to swell; then washing and drying to obtain swollen POE particles. The solvent is sprayed uniformly onto the surface of the POE resin particles in a mist form. During the spraying process, the POE resin is stirred at a low speed while spraying for a period of time to ensure that each POE resin particle is wetted. The wetted POE particles are then spread in a thin layer on a tray and allowed to swell. The swelling environment temperature is 0~10℃, specifically 0℃, 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, and 10℃. The static swelling time is 2~4 hours, specifically 2 hours, 3 hours, and 4 hours, more preferably 3 hours. The above treatment causes the POE resin particles to swell without dissolving, increasing the internal volume space of the POE molecular chains. The washing is preferably done with ethanol. The drying is preferably vacuum drying.

[0142] In step K2: the solvent is preferably a mixture of n-heptane and ethyl acetate; the volume ratio of n-heptane to ethyl acetate is preferably 8:2. The preferred amounts (parts by mass) of each substance are as follows: 100 parts of swollen POE particles, 1-5 parts of maleic anhydride, 0.5-2 parts of zinc stearate, 0.5-2 parts of calcium stearate, and 300 parts of solvent. The mixing can be carried out in a high-speed mixer. There are no special restrictions on the mixing conditions, as long as the above materials are thoroughly mixed.

[0143] In step K3: the initiator is preferably AIBN (azobisisobutyronitrile). Based on 100 parts by mass of swollen POE particles used in step K2, the amount of initiator is preferably 0.5 to 2 parts, specifically 0.5 parts, 1.0 parts, 1.5 parts, or 2.0 parts. Step K3 preferably includes: adding the initiator solution dropwise to the mixture obtained in step K2, heating the reaction to obtain POE-g-MAH. The initiator solution is a solution formed by dissolving the initiator in a solvent, preferably a mixed solvent of n-heptane and ethyl acetate; the volume ratio of n-heptane to ethyl acetate is preferably 8:2; the mass ratio of initiator to solvent is preferably (0.5~2):20. The heating temperature is preferably 80~90℃, specifically 80℃, 85℃, or 90℃; the heating time is preferably 2~4 hours, specifically 2 hours, 3 hours, or 4 hours. Stirring is preferably present throughout the reaction. The reaction is preferably carried out in an inert atmosphere, more preferably in a nitrogen atmosphere. After the reaction is complete, the mixture is cooled to room temperature, washed, and dried. Washing is preferably done with ethanol. Drying is preferably done under vacuum. After the above treatment, POE-g-MAH is obtained.

[0144] In this invention, the source of the EVA resin is not particularly limited, and any commercially available product is acceptable. The amount of EVA resin used is 50 to 90 parts, specifically 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, and 90 parts.

[0145] In this invention, the foaming agent is preferably AC foaming agent (azodicarbonamide). The amount of the foaming agent used is 1 to 5 parts, specifically 1 part, 2 parts, 3 parts, 4 parts, or 5 parts.

[0146] In this invention, the amount of NaHCO3 used is 0.5 to 2 parts, specifically 0.5 parts, 1 part, or 2 parts.

[0147] In this invention, the amount of stearic acid used is 1 to 4 parts, specifically 1 part, 2 parts, 3 parts, or 4 parts.

[0148] In this invention, the amount of zinc oxide used is 2 to 4 parts, specifically 2 parts, 3 parts, or 4 parts.

[0149] In this invention, the silane coupling agent is preferably at least one of KH550, KH570, and Si-69. The amount of the silane coupling agent used is 1 to 5 parts, specifically 1 part, 2 parts, 3 parts, 4 parts, or 5 parts.

[0150] In this invention, the source of the nano-calcium carbonate is not particularly limited; it can be any commercially available product. The amount of nano-calcium carbonate used is 0.5 to 3 parts, specifically 0.5 parts, 1 part, 2 parts, or 3 parts.

[0151] In this invention, the crosslinking agent is preferably DCP and TAIC. The mass ratio of DCP to TAIC is preferably 1:2. The amount of the crosslinking agent is 1 to 3 parts, specifically 1 part, 2 parts, 2.4 parts, or 3 parts.

[0152] In this invention, the antioxidant is preferably at least one of antioxidant 1010, antioxidant 1076, and antioxidant 168. The amount of the antioxidant is 0.1 to 1 part, specifically 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, or 1 part.

[0153] In this invention, the preparation method of the upper foamed impact-resistant layer 2a is as follows: POE-g-MAH, EVA resin, foaming agent, NaHCO3, stearic acid, zinc oxide, silane coupling agent, nano calcium carbonate, crosslinking agent and antioxidant are processed uniformly by internal mixer, and then extruded, calendered and formed into a sheet to obtain the upper foamed impact-resistant layer.

[0154] In this invention, preferably, the preparation method includes: adding POE-g-MAH, EVA resin, stearic acid, zinc oxide, antioxidant, nano-calcium carbonate, NaHCO3, and silane coupling agent into a mixer for mixing; then adding a crosslinking agent for further mixing; finally adding a foaming agent and mixing thoroughly; extruding, calendering, and molding into a sheet to obtain an upper foamed impact-resistant layer. The mixing temperature is 90~110℃, specifically 90℃, 95℃, 100℃, 105℃, or 110℃, preferably 100℃. After mixing, the mixture is cooled and then mixed again at a temperature ≤90℃, more preferably 80~90℃, specifically 80℃, 85℃, or 90℃.

[0155] In this invention, the thickness of the upper foamed impact-resistant layer 2a is preferably ≥4mm.

[0156] Regarding the lower foamed impact-resistant layer 2b :

[0157] According to the present invention, the lower foamed impact-resistant layer 2b is disposed on the lower surface of the glass fiber cloth reinforced composite layer 1.

[0158] In this invention, the width of the lower foamed impact-resistant layer 2b is the same as the width of the glass fiber reinforced composite layer 1, and the length of the lower foamed impact-resistant layer 2b is less than the length of the glass fiber reinforced composite layer 1. Preferably, the length of the lower foamed impact-resistant layer 2b is 0.2~0.5m shorter than the length of the glass fiber reinforced composite layer 1. In this invention, the center point of the lower foamed impact-resistant layer 2b is aligned with the center point of the glass fiber reinforced composite layer 1. In this invention, the lower foamed impact-resistant layer 2b and the upper foamed impact-resistant layer 2a are symmetrical about the glass fiber reinforced composite layer 1.

[0159] In this invention, preferably, the length of the lower foamed impact-resistant layer 2b is the same as the length of the upper foamed impact-resistant layer 2a.

[0160] In this invention, the thickness of the lower foamed impact-resistant layer 2b is preferably ≥4mm. More preferably, the thickness of the lower foamed impact-resistant layer 2b is the same as the thickness of the upper foamed impact-resistant layer 2a.

[0161] In this invention, the preparation method of the lower foamed impact-resistant layer 2b is the same as the preparation method of the upper foamed impact-resistant layer 2a, and will not be described again here.

[0162] Regarding the head and tail adhesives 3a and 3b :

[0163] Because the length of the upper foamed impact-resistant layer 2a is less than that of the glass fiber reinforced composite layer 1, a portion of the upper surface of the glass fiber reinforced composite layer 1 is covered by the upper foamed impact-resistant layer 2a along its length, while remaining exposed at both ends of the upper foamed impact-resistant layer 2a (e.g., ...). Figure 3 (As shown). In this invention, an upper head and tail adhesive 3a is provided on the upper surface of the glass fiber reinforced composite layer 1, in the area exposed at both ends of the upper foamed impact-resistant layer 2a along its length, to seal the two ends of the upper foamed impact-resistant layer 2a. The sealing refers to ensuring that the area of ​​the upper surface of the glass fiber reinforced composite layer 1 exposed at both ends of the upper foamed impact-resistant layer 2a is completely covered by the head and tail adhesive and flush with the two ends of the glass fiber reinforced composite layer 1.

[0164] In this invention, preferably, the upper head and tail adhesive 3a and the upper foamed impact-resistant layer 2a have the same thickness, that is, the two are at the same height on the upper surface of the glass fiber cloth reinforced composite layer 1, so that the upper surface of the upper head and tail adhesive 3a and the upper surface of the upper foamed impact-resistant layer 2a form a neat surface.

[0165] In this invention, the raw materials for the head and tail adhesive 3a include:

[0166] Natural gum: 50-80 parts;

[0167] Styrene-butadiene rubber: 20-50 parts;

[0168] Carbon black: 20-50 parts;

[0169] Coumarone resin: 2-8 parts;

[0170] Zinc oxide: 1-3 parts;

[0171] Stearic acid: 1-2 parts;

[0172] Anti-aging agent: 0.5~2 parts;

[0173] Accelerator: 1-3 parts;

[0174] Sulfur: 1-2 parts.

[0175] The natural rubber is natural rubber (NR). The amount of natural rubber used is 50 to 80 parts, specifically 50 parts, 60 parts, 70 parts, or 80 parts, more preferably 80 parts.

[0176] The amount of styrene-butadiene rubber used is 20 to 50 parts, specifically 20 parts, 30 parts, 40 parts, or 50 parts, more preferably 20 parts. The total amount of natural rubber and styrene-butadiene rubber is preferably 100 parts.

[0177] The carbon black is preferably N220 carbon black. The amount of carbon black used is 20 to 50 parts, specifically 20 parts, 30 parts, 40 parts, or 50 parts, more preferably 30 parts.

[0178] There are no special restrictions on the source of the coumarone resin; any commercially available product is acceptable. The amount of the coumarone resin used is 2 to 8 parts, specifically 2, 3, 4, 5, 6, 7, or 8 parts, with 5 parts being more preferred.

[0179] The amount of zinc oxide used is 1 to 3 parts, specifically 1 part, 2 parts, or 3 parts, more preferably 2 parts.

[0180] The amount of stearic acid used is 1 to 2 parts, specifically 1 part, 1.5 parts, or 2 parts, more preferably 1.5 parts.

[0181] The antioxidant is preferably at least one of antioxidant RD, antioxidant 4010, antioxidant 4020, and antioxidant BLE. The amount of the antioxidant is 0.5 to 2 parts, specifically 0.5 parts, 1 part, 1.5 parts, or 2 parts, more preferably 1 part.

[0182] The accelerator is preferably at least one selected from accelerator CZ, accelerator TMTD, accelerator NS, and accelerator DM. The amount of the accelerator is 1 to 3 parts, specifically 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, more preferably 1.5 parts.

[0183] The sulfur is preferably industrial sulfur. The amount of sulfur used is 1 to 2 parts, specifically 1 part, 1.5 parts, or 2 parts, more preferably 2 parts.

[0184] In this invention, the preparation method of the top and bottom rubber 3a includes: mixing natural rubber, styrene-butadiene rubber, carbon black, coumarone resin, zinc oxide, stearic acid, antioxidant, and accelerator evenly in an internal mixer; then adding sulfur, mixing again, discharging the rubber, allowing it to stand, and calendering it into sheets to obtain the rubber compound. The mixing temperature is 100~120℃, specifically 100℃, 105℃, 110℃, 115℃, or 120℃, preferably 120℃. The internal mixing temperature is 90~110℃, specifically 90℃, 95℃, 100℃, 105℃, or 110℃, preferably 110℃. The standing time is 4~6 hours, specifically 4 hours, 5 hours, or 6 hours.

[0185] Since the structural relationship between the lower surface of the glass fiber reinforced composite layer 1 and the lower foamed impact-resistant layer 2b is the same as the structural relationship between the upper surface of the glass fiber reinforced composite layer 1 and the upper foamed impact-resistant layer 2a, similarly, a lower head and tail adhesive 3b is provided on the lower surface of the glass fiber reinforced composite layer 1. The structure and dimensions of the lower head and tail adhesive 3b are the same as those of the upper head and tail adhesive 3a described above, and will not be repeated here. The material of the lower head and tail adhesive 3b is the same as that of the upper head and tail adhesive 3a, and will not be repeated here either.

[0186] Regarding the top cover adhesive layer 4a :

[0187] In this invention, the upper cover adhesive layer 4a covers the surface of the upper foamed impact-resistant layer 2a, forming the top surface of the conveyor belt. In this invention, the length of the upper cover adhesive layer 4a is the same as the length of the glass fiber reinforced composite layer 1, and the width of the upper cover adhesive layer 4a is the same as the width of the glass fiber reinforced composite layer 1.

[0188] In this invention, the material of the upper covering adhesive layer 4a is the same as that of the upper head and tail adhesive 3a, and will not be described again here.

[0189] In this invention, the thickness of the upper covering adhesive layer 4a is preferably 2 to 6 mm.

[0190] Regarding the undercoat layer 4b :

[0191] In this invention, the lower cover adhesive layer 4b covers the surface of the lower foamed impact-resistant layer 2b, forming the bottom surface of the conveyor belt. The length of the lower cover adhesive layer 4b is the same as the length of the glass fiber reinforced composite layer 1, and the width of the lower cover adhesive layer 4b is the same as the width of the glass fiber reinforced composite layer 1. The lower cover adhesive layer 4b and the upper cover adhesive layer 4a are symmetrical about the glass fiber reinforced composite layer 1. Preferably, the center points of the glass fiber reinforced composite layer 1, the upper foamed impact-resistant layer 2a, the lower foamed impact-resistant layer 2b, the upper cover adhesive layer 4a, and the lower cover adhesive layer 4b are all aligned.

[0192] In this invention, the thickness of the lower cover adhesive layer 4b is preferably 2-6 mm, more preferably the same as the thickness of the upper cover adhesive layer 4a. In this invention, the material of the lower cover adhesive layer 4b is the same as that of the upper head and tail adhesive 3a, and will not be described again here.

[0193] Regarding the edge sealing adhesive layer 5 :

[0194] In this invention, the upper cover adhesive layer 4a, the glass fiber cloth reinforced composite layer 1, and the lower cover adhesive layer 4b all have the same width. The invention provides edge sealing adhesive 5 on both sides of the upper cover adhesive layer 4a and the lower cover adhesive layer 4b in the width direction for edge sealing (e.g., ...). Figure 2 (As shown). The edge sealing refers to completely filling the side edges on both sides of the width direction between the upper cover adhesive layer 4a and the lower cover adhesive layer 4b with the edge sealing adhesive, that is, both sides of the width direction from the upper cover adhesive layer 4a to the lower cover adhesive layer 4b are completely sealed with edge sealing adhesive. Therefore, the thickness of the edge sealing adhesive 5 is the same as the total thickness of the upper cover adhesive layer 4a, the fiberglass cloth reinforced composite layer 1, the upper foamed impact-resistant layer 2a, the lower foamed impact-resistant layer 2b, and the lower cover adhesive layer 4b (e.g., Figure 2 (As shown).

[0195] In this invention, the material of the edge sealing adhesive 5 is the same as that of the top and bottom adhesive 3a, and will not be described again here.

[0196] In this invention, the structural configuration of one side of the lower surface of the glass fiber cloth reinforced composite layer 1 is the same as and symmetrical to the structural configuration of one side of its upper surface.

[0197] In this article, "upper" and "lower" do not have any special directional restrictions, but only represent relative relationships. Taking the glass fiber cloth reinforced composite layer 1 as an example, one of its two surfaces is the upper surface, and the other side is naturally the lower surface.

[0198] Secondly, the present invention also provides a method for preparing the conveyor belt described in the above technical solution, comprising: combining a glass fiber cloth reinforced composite layer 1, an upper foamed impact-resistant layer 2a, a lower foamed impact-resistant layer 2b, an upper cover rubber layer 4a, and a lower cover rubber layer 4b together to form a belt blank; placing the belt blank into a mold frame; molding and vulcanizing it in a vulcanizing flat plate machine; then bonding the upper head and tail rubber 3a, the lower head and tail rubber 3b, and the edge sealing rubber 5 together with the vulcanized belt blank; and vulcanizing the edges to obtain the conveyor belt.

[0199] The compression molding and vulcanization process preferably includes: preheating, crosslinking reaction, foaming reaction, and finally pressure holding and shaping. The preheating conditions are as follows: temperature 90-110℃ (preferably 100℃), pressure 1-3MPa (preferably 1.0MPa), time 5-10min (preferably 5min); the gas between layers is discharged through the preheating treatment. The crosslinking reaction conditions are as follows: temperature 145-155℃ (preferably 150℃), pressure 10-15MPa (preferably 10MPa), time 5-10min (preferably 8min); the crosslinking reaction is carried out under the above conditions, and the pressure is released. The foaming reaction conditions are as follows: temperature 145-155℃ (preferably 150℃), pressure 5-10MPa (preferably 5MPa), time 10-20min (preferably 15min). The pressure holding and shaping conditions are as follows: temperature 145~155℃ (preferably 150℃), pressure 5~10MPa (preferably 8MPa), time 5~10min (preferably 5min); the foamed structure is stabilized after the above pressure holding and shaping.

[0200] After all the above processes, the sample is removed, the edges are trimmed neatly, and adhesive is applied. The upper and lower head and tail adhesives 3a, lower head and tail adhesives 3b, and edge sealing adhesive 5 are then bonded to the vulcanized belt blank, and the edges are vulcanized. The adhesive used is not particularly limited and can be any conventional adhesive used in the art for bonding various structural parts, such as Chemlock adhesive. The vulcanization conditions for the edges are as follows: temperature 150℃, pressure 3.0 MPa, and time 10 min. After the above edge vulcanization, the conveyor belt is obtained.

[0201] The conveyor belt provided by this invention is an impact-resistant multi-layer glass fiber reinforced conveyor belt. This invention uses a warp and weft mesh structure of glass fiber as the skeleton material of the conveyor belt and undergoes a specific impregnation treatment. Simultaneously, the composition of the foamed impact-resistant layer is rationally designed, resulting in a lighter weight, higher tensile strength, and more uniform stress distribution compared to traditional steel cord core and fabric core conveyor belts. It also effectively absorbs impact energy from external sources, improving impact resistance. The conveyor belt produced by this invention not only possesses excellent flame retardancy, tensile strength, and toughness, but also features a low coefficient of thermal expansion, low shrinkage, dimensional stability, resistance to deformation, lightweight design, and low price.

[0202] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0203] Preliminary Example 1: Preparation of POE-g-MAH

[0204] K1. At room temperature, 30 parts of cyclohexane solution were sprayed evenly on the surface of POE resin particles in the form of a mist while stirring at low speed for 5 minutes to ensure that each POE resin particle was wetted. The wetted POE particles were spread in a thin layer on a tray and allowed to swell at 10°C for 3 hours. After that, the particles were washed with ethanol and dried under vacuum to obtain swollen POE resin particles.

[0205] K2. Take 100 parts of swollen POE resin particles, 5 parts of maleic anhydride, 1 part of zinc stearate, 1 part of calcium stearate, and 300 parts of n-heptane-ethyl acetate mixed solvent (volume ratio 8:2), mix them evenly in a high-speed mixer to obtain a mixture.

[0206] K3. Dissolve 1.5 parts of initiator AIBN in 20 parts of a mixed solvent of n-heptane and ethyl acetate (volume ratio 8:2) to obtain an initiator solution. Gradually and slowly add the initiator solution to the mixture obtained in step K2. In a reaction vessel under nitrogen atmosphere, heat to 85°C and stir for 3 hours. Then continue to purge nitrogen and cool to room temperature. Wash the reactants three times with ethanol solution and dry under vacuum to obtain POE-g-MAH.

[0207] Example 1

[0208] 1. A conveyor belt, with the following structure: Figure 1-2 As shown, it includes:

[0209] Fiberglass cloth reinforced composite layer 1;

[0210] The upper surface of the glass fiber reinforced composite layer 1 is laminated with an upper foamed impact-resistant layer 2a; the width of the upper foamed impact-resistant layer 2a is the same as the width of the glass fiber reinforced composite layer 1, and the length of the upper foamed impact-resistant layer 2a is less than the length of the glass fiber reinforced composite layer 1; and the areas on the upper surface of the glass fiber reinforced composite layer 1 exposed at both ends of the upper foamed impact-resistant layer 2a in the length direction are provided with upper head and tail adhesive 3a to seal the two ends of the upper foamed impact-resistant layer 2a.

[0211] The lower surface of the glass fiber reinforced composite layer 1 is laminated with a lower foamed impact-resistant layer 2b; the width of the lower foamed impact-resistant layer 2b is the same as the width of the glass fiber reinforced composite layer 1, and the length of the lower foamed impact-resistant layer 2b is less than the length of the glass fiber reinforced composite layer 1; and the areas on the lower surface of the glass fiber reinforced composite layer 1 exposed at both ends of the lower foamed impact-resistant layer 2b in the length direction are provided with lower end adhesive 3b to seal the two ends of the lower foamed impact-resistant layer 2b; the composition and dimensions of the lower foamed impact-resistant layer 2b are the same as those of the upper foamed impact-resistant layer 2a;

[0212] The surface of the upper foamed impact-resistant layer 2a is coated with an upper cover adhesive layer 4a; and the length of the upper cover adhesive layer 4a is the same as the length of the glass fiber cloth reinforced composite layer 1, and the width of the upper cover adhesive layer 4a is the same as the width of the glass fiber cloth reinforced composite layer 1.

[0213] The surface of the lower foamed impact-resistant layer 2b is coated with a lower cover adhesive layer 4b; and the length of the lower cover adhesive layer 4b is the same as the length of the glass fiber cloth reinforced composite layer 1, and the width of the lower cover adhesive layer 4b is the same as the width of the glass fiber cloth reinforced composite layer 1.

[0214] The upper cover adhesive layer 4a and the lower cover adhesive layer 4b are sealed with edge sealing adhesive 5 on both sides in the width direction.

[0215] in:

[0216] (1) Glass fiber cloth reinforced composite layer 1:

[0217] The glass fiber reinforced composite layer 1 comprises three layers of glass fiber reinforced layers. The glass fiber used is woven from high-silica glass fiber filaments (SiO2 content > 96%) in a 90° cross-weft pattern, resulting in glass fiber cloth with the same transverse (weft) and longitudinal (warp) density. The glass fiber cloth is a commercially available glass fiber cloth modified with a silane coupling agent.

[0218] The glass fiber cloth reinforcement layer is prepared by the following method: the glass fiber cloth is immersed in the adhesive solution at a temperature of 50°C for 5 minutes, and then the adhesive solution is squeezed to fill the mesh structure of the glass fiber cloth using a squeeze roller. After that, the excess adhesive solution is squeezed out and drained, and then dried in an oven at 80°C until the adhesive solution solidifies to obtain the glass fiber cloth reinforcement layer.

[0219] The adhesive solution used in the impregnation process comprises the following components in parts by weight:

[0220] Main materials (natural rubber + styrene-butadiene rubber, with natural rubber accounting for 40%): 100 parts;

[0221] Solvent (gasoline): 300 parts;

[0222] Adhesive RS: 2 parts;

[0223] Adhesive RA: 2 parts;

[0224] Silane coupling agent Si-69: 2 parts;

[0225] Stearic acid: 1 part;

[0226] Accelerator DM: 3 parts;

[0227] Vulcanizing agent DCP: 1.5 parts.

[0228] (2) Upper and lower foamed impact-resistant layers:

[0229] The raw materials for the foamed impact-resistant layer include:

[0230] POE-g-MAH (obtained from Example 1): 50 portions;

[0231] EVA resin: 50 parts;

[0232] Foaming agent AC: 2 parts;

[0233] NaHCO3: 1 part;

[0234] Stearic acid: 1 part;

[0235] Zinc oxide: 2 parts;

[0236] Silane coupling agent Si-69: 1 part;

[0237] Nano calcium carbonate: 1 part;

[0238] Crosslinking agent: 2.4 parts (DCP: 0.8 parts, TAIC: 1.6 parts);

[0239] Antioxidant 1010: 0.5 parts.

[0240] Preparation of the foamed impact-resistant layer: EVA resin, POE-g-MAH, zinc oxide, stearic acid, antioxidant, nano calcium carbonate, NaHCO3 and silane coupling agent are mixed evenly in a mixer at 100°C, cooled to below 90°C, crosslinking agent is added and mixed evenly again, then foaming agent is added, mixed evenly, extruded, calendered and formed into a sheet with a sheet thickness of 5mm, for later use.

[0241] (3) Cover adhesive, head and tail adhesive, and edge sealing adhesive:

[0242] Raw materials: 80 parts natural rubber, 20 parts styrene-butadiene rubber, 30 parts N220 carbon black, 5 parts coumarone resin, 2 parts zinc oxide, 1.5 parts stearic acid, 1 part antioxidant RD, 2.5 parts accelerator CZ, and 2 parts industrial sulfur.

[0243] Preparation: Natural rubber, styrene-butadiene rubber, N220 carbon black, coumarone resin, zinc oxide, stearic acid, antioxidant and accelerator are added to a mixer and mixed evenly at 120°C. Then industrial sulfur is added and the mixture is mixed at 110°C. After discharging the rubber, it is left to stand for 5 hours and then calendered into 5mm sheets for later use.

[0244] 2. Preparation of conveyor belt:

[0245] Three layers of fiberglass cloth reinforcement are laminated together to form a fiberglass cloth reinforced composite layer. The fiberglass cloth reinforcement layer, upper and lower foamed impact-resistant layers, and upper and lower cover adhesive layers are laminated together to form a belt blank. The belt blank is placed in a mold frame and preheated for 5 minutes in a vulcanizing plate at 100℃ and 1.0MPa to remove the gas between the layers. Then, it is molded on a plate at 150℃ and 10MPa for 8 minutes to carry out a cross-linking reaction. After releasing the pressure, it is foamed at 150℃ and 5MPa for 15 minutes. Then, the pressure is increased to 8MPa and held for 5 minutes to stabilize the foamed structure. After removal, the edges are trimmed neatly and coated with Chemlock adhesive to seal the edges and bond them to the belt blank. The edges are then vulcanized to obtain the finished conveyor belt.

[0246] Example 2

[0247] Implemented according to Example 1, except that the raw materials for the upper and lower foamed impact-resistant layers include:

[0248] POE-g-MAH: 30 portions;

[0249] EVA resin: 70 parts;

[0250] Foaming agent AC: 2 parts;

[0251] NaHCO3: 1 part;

[0252] Stearic acid: 1 part;

[0253] Zinc oxide: 2 parts;

[0254] Silane coupling agent Si-69: 1 part;

[0255] Nano calcium carbonate: 1 part;

[0256] Crosslinking agent: 3 parts (DCP: 1 part, TAIC: 2.0 parts);

[0257] Antioxidant 1010: 0.5 parts.

[0258] Example 3

[0259] Implemented according to Example 1, except that the raw materials for the upper and lower foamed impact-resistant layers include:

[0260] POE-g-MAH: 10 portions;

[0261] EVA resin: 90 parts;

[0262] Foaming agent AC: 2 parts;

[0263] NaHCO3: 1 part;

[0264] Stearic acid: 1 part;

[0265] Zinc oxide: 2 parts;

[0266] Silane coupling agent Si-69: 1 part;

[0267] Nano calcium carbonate: 1 part;

[0268] Crosslinking agent: 3.6 parts (DCP: 1.2 parts, TAIC: 2.4 parts);

[0269] Antioxidant 1010: 0.5 parts.

[0270] Comparative Example 1

[0271] The implementation follows Example 1, except that it does not include the upper and lower foamed impact-resistant layers, while the other parts (such as the fiberglass cloth reinforced composite layer, upper and lower cover adhesive, and edge sealing adhesive) are the same as in Example 1.

[0272] Comparative Example 2

[0273] The implementation follows Example 1, except that the POE-g-MAH in the upper and lower foamed impact-resistant layers is replaced with POE (i.e., POE without maleic anhydride grafting).

[0274] Comparative Example 3

[0275] The implementation follows Example 2, except that the POE-g-MAH in the upper and lower foamed impact-resistant layers is replaced with POE (i.e., POE without maleic anhydride grafting).

[0276] Product Testing :

[0277] The drop hammer impact strength of the conveyor belt was tested according to Appendix A of HG / T 3646-2014. The results are shown in Table 1.

[0278] Table 1: Product Test Results

[0279]

[0280] As can be seen from the test results in the table above, the conveyor belts obtained in Examples 1-3 of the present invention exhibit a breakdown impact strength of over 748 N·m, demonstrating excellent impact resistance. Among them, the conveyor belt exhibits the highest impact resistance when the EVA:POE-g-MAH ratio in the foamed impact-resistant layer is 50:50 (corresponding to Example 1). In contrast, Comparative Example 1, which does not have a foamed impact-resistant layer, shows a significant decrease in the impact resistance of the resulting product. Comparative Examples 2-3, which have foamed impact-resistant layers but use POE without maleic anhydride grafting, also show a significant decrease in impact resistance. Specific examples have been used in this paper to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are similar to the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A conveyor belt, characterized in that, include: Fiberglass cloth reinforced composite layer (1); The upper surface of the glass fiber reinforced composite layer (1) is coated with an upper foamed impact-resistant layer (2a); the width of the upper foamed impact-resistant layer (2a) is the same as the width of the glass fiber reinforced composite layer (1), and the length of the upper foamed impact-resistant layer (2a) is less than the length of the glass fiber reinforced composite layer (1); and the area on the upper surface of the glass fiber reinforced composite layer (1) exposed at both ends of the upper foamed impact-resistant layer (2a) in the length direction is provided with upper head and tail adhesive (3a) to seal the two ends of the upper foamed impact-resistant layer (2a); The lower surface of the glass fiber reinforced composite layer (1) is coated with a lower foamed impact-resistant layer (2b); the width of the lower foamed impact-resistant layer (2b) is the same as the width of the glass fiber reinforced composite layer (1), and the length of the lower foamed impact-resistant layer (2b) is less than the length of the glass fiber reinforced composite layer (1); and the area on the lower surface of the glass fiber reinforced composite layer (1) exposed at both ends of the lower foamed impact-resistant layer (2b) in the length direction is provided with a lower head and tail adhesive (3b) to seal the two ends of the lower foamed impact-resistant layer (2b); The surface of the upper foamed impact-resistant layer (2a) is coated with an upper cover adhesive layer (4a); and the length of the upper cover adhesive layer (4a) is the same as the length of the glass fiber cloth reinforced composite layer (1), and the width of the upper cover adhesive layer (4a) is the same as the width of the glass fiber cloth reinforced composite layer (1). The surface of the lower foamed impact-resistant layer (2b) is coated with a lower cover adhesive layer (4b); and the length of the lower cover adhesive layer (4b) is the same as the length of the glass fiber cloth reinforced composite layer (1), and the width of the lower cover adhesive layer (4b) is the same as the width of the glass fiber cloth reinforced composite layer (1). The upper cover adhesive layer (4a) and the lower cover adhesive layer (4b) are provided with edge sealing adhesive (5) on both sides in the width direction for edge sealing; in: The glass fiber cloth reinforced composite layer (1) includes several layers of glass fiber cloth reinforcement; The glass fiber cloth reinforcement layer is obtained by the following method: impregnating glass fiber cloth with resin to obtain the glass fiber cloth reinforcement layer; The adhesive solution used in the impregnation process comprises the following components in parts by weight: Main materials: 80-100 copies; Solvent: 100~500 parts; Adhesive: 2-10 parts; Silane coupling agent: 1-3 parts; Stearic acid: 1-2 parts; Accelerator: 3-6 parts; Vulcanizing agent: 1-4 parts; The main material is two or more of the following: natural rubber, styrene-butadiene rubber, cis-butadiene rubber, and carboxyl-terminated nitrile rubber.

2. The conveyor belt according to claim 1, characterized in that, The raw materials for preparing the upper foamed impact-resistant layer (2a) include: POE-g-MAH: 10~50 parts; EVA resin: 50-90 parts; Foaming agent: 1-5 parts; NaHCO3: 0.5~2 parts; Stearic acid: 1-4 parts; Zinc oxide: 2-4 parts; Silane coupling agent: 1-5 parts; Nano-calcium carbonate: 0.5~3 parts; Crosslinking agent: 1-3 parts; Antioxidant: 0.1~1 part.

3. The conveyor belt according to claim 2, characterized in that, The POE-g-MAH was prepared by the following method: K1. The POE resin particles are swollen by contacting them with a solvent, then washed and dried to obtain swollen POE particles. K2. Mix the swollen POE particles, maleic anhydride, zinc stearate, calcium stearate, and solvent to obtain a mixture; K3. The mixture is mixed with an initiator and heated to react, yielding POE-g-MAH.

4. The conveyor belt according to claim 3, characterized in that, In step K1, the solvent is cyclohexane; Step K1 specifically includes: spraying solvent onto the surface of POE resin particles while stirring, then spreading the wetted POE particles on a tray and allowing them to swell; then washing and drying to obtain swollen POE particles; wherein the temperature for the static swelling is 0~10℃ and the time is 2~4h.

5. The conveyor belt according to claim 3, characterized in that, In step K2: The solvent is a mixture of n-heptane and ethyl acetate; the volume ratio of n-heptane to ethyl acetate is 8:

2. The amounts of each substance are as follows: 100 parts of swollen POE granules, 1-5 parts of maleic anhydride, 0.5-2 parts of zinc stearate, 0.5-2 parts of calcium stearate, and 300 parts of solvent. In step K3: The initiator is AIBN; Based on 100 parts by mass of swollen POE particles used in step K2, the amount of initiator is 0.5 to 2 parts; The heating reaction is carried out at a temperature of 80-90°C for 2-4 hours.

6. The conveyor belt according to claim 1, characterized in that, The preparation method of the upper foamed impact-resistant layer (2a) includes: adding POE-g-MAH, EVA resin, stearic acid, zinc oxide, antioxidant, nano calcium carbonate, NaHCO3 and silane coupling agent into a mixer for mixing, then adding a crosslinking agent for further mixing, and finally adding a foaming agent for mixing, extruding, calendering and forming into a sheet to obtain the upper foamed impact-resistant layer.

7. The conveyor belt according to any one of claims 1 to 6, characterized in that, The material of the lower foamed impact-resistant layer (2b) is the same as that of the upper foamed impact-resistant layer (2a).

8. The conveyor belt according to claim 1, characterized in that, The raw materials for the head and tail adhesive (3a) include: Natural gum: 50-80 parts; Styrene-butadiene rubber: 20-50 parts; Carbon black: 20-50 parts; Coumarone resin: 2-8 parts; Zinc oxide: 1-3 parts; Stearic acid: 1-2 parts; Anti-aging agent: 0.5~2 parts; Accelerator: 1-3 parts; Sulfur: 1-2 parts; The preparation method of the top and bottom rubber (3a) includes: mixing natural rubber, styrene-butadiene rubber, carbon black, coumarone resin, zinc oxide, stearic acid, antioxidant and accelerator evenly in an internal mixer, then adding sulfur, mixing in an internal mixer, discharging the rubber, letting it stand, calendering and extruding it into sheets to obtain the rubber compound. The material of the lower head and tail adhesive (3b) is the same as that of the upper head and tail adhesive (3a); The material of the upper cover adhesive layer (4a) is the same as that of the upper head and tail adhesive (3a); The material of the lower cover adhesive layer (4b) is the same as that of the upper head and tail adhesive (3a); The edge sealing adhesive (5) is made of the same material as the top and bottom adhesive (3a).

9. A method for preparing a conveyor belt according to any one of claims 1 to 8, characterized in that, include: A fiberglass cloth reinforced composite layer (1), an upper foamed impact-resistant layer (2a), a lower foamed impact-resistant layer (2b), an upper cover adhesive layer (4a), and a lower cover adhesive layer (4b) are combined together to form a belt blank. The belt blank is placed in a mold frame and molded and vulcanized in a vulcanizing flat plate machine. Then, the upper head and tail adhesive (3a), the lower head and tail adhesive (3b), and the edge sealing adhesive (5) are bonded together with the vulcanized belt blank, and the edges are vulcanized to obtain a conveyor belt.

10. The preparation method according to claim 9, characterized in that, The compression molding vulcanization process preferably includes: preheating, crosslinking reaction, foaming reaction, and finally pressure holding and shaping. The preheating conditions are as follows: temperature 90~110℃, pressure 1~3MPa, time 5~10min; the crosslinking reaction conditions are as follows: temperature 145~155℃, pressure 10~15MPa, time 5~10min; the foaming reaction conditions are as follows: temperature 145~155℃, pressure 5~10MPa, time 10~20min; the pressure holding and shaping conditions are as follows: temperature 145~155℃, pressure 5~10MPa, time 5~10min.

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