A wear-resistant and highly elastic IXPE foam and a preparation method thereof

Abstract

The present invention relates to the field of material technology, discloses a kind of wear-resistant and highly elastic IXPE foam and preparation method thereof, the IXPE foam is made of low-density polyethylene as main material, wear-resistant additives etc. as auxiliary materials, through extrusion granulation, electron irradiation, foaming treatment kilometers, wherein the wear-resistant additive is the jute fiber of magnesium hydroxide load, magnesium hydroxide and jute fiber are connected by a connecting agent, and during the material friction process, magnesium hydroxide can be relatively slipped on the jute fiber surface, producing a ball effect, thereby effectively improving the wear resistance of the material. In addition, the connecting agent is a macromolecular substance with an alternating structure of isocyanuric acid and flame retardant FRC-6, and containing a siloxane active functional group, which can rapidly form an expanded carbon layer of silicon oxide when the material burns, can be rapidly covered on the material surface, can be coordinated with magnesium hydroxide, prevent combustion from further proceeding, thereby greatly improving the flame retardant of the material.

Description

Technical Field

[0001] The invention relates to the technical field of materials, and in particular to a wear-resistant and highly elastic IXPE foam and a preparation method thereof. Background Art

[0002] IXPE foam, the full name of which is electron radiation cross-linked polyethylene foam material, is a high-grade closed-cell foam material with wide applications and superior performance. It is made of polyethylene as the main raw material, through green and healthy processing technology, using ion radiation to act on the material. This special processing technology can make the material form an independent closed bubble structure. This semi-rigid foam structure has good elasticity and can quickly restore its original shape after a strong impact, and is not easy to deform or break. In addition, the fine independent bubble structure of IXPE foam can effectively reduce the energy exchange caused by air convection, thus having good thermal insulation performance. At the same time, its structure can also effectively absorb and isolate sound, reducing noise pollution. This makes IXPE foam an ideal choice for thermal insulation and sound insulation materials.

[0003] However, IXPE foam has poor wear resistance and the foaming material itself is flammable, which means that its service life and safety cannot be guaranteed. As all walks of life gradually pay more attention to safety, these defects of IXPE foam have gradually become a huge obstacle to its further application. Therefore, the preparation of IXPE foam with excellent functional properties such as wear resistance and flame retardancy is of great significance to its further development. Summary of the invention

[0004] In order to solve the problems mentioned in the background technology, the object of the present invention is to provide a wear-resistant and highly elastic IXPE foam and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing wear-resistant and highly elastic IXPE foam, wherein the IXPE foam is made of the following raw materials in parts by weight:

[0007]

[0008] The preparation method comprises the following steps:

[0009] The first step is to feed low-density polyethylene, ethylene-acetic acid copolymer and foaming agent into a mixer, stir and mix at a speed of 1000-1500r / min for 10-15min, then add a curing agent into the mixer, continue stirring for 5-10min, and then transfer the formed mixture into an extruder for extrusion granulation to obtain pellet 1;

[0010] Step 2: Add the wear-resistant additive, color masterbatch and antioxidant into the mixer, mix for 5-10 minutes at a stirring rate of 500-1000 r / min, and then transfer into the extruder for extrusion granulation to obtain pellet 2;

[0011] Step 3: Evenly mix the pellets 1 and 2 and granulate them to form a precursor material. After placing the precursor material in a temperature environment of 80±5°C for 10-20 minutes, the precursor material is extruded into a sheet at a temperature of 100-120°C, and then the formed sheet is electron irradiated to form a coil.

[0012] Step 4: Place the coiled material in a temperature condition of 200-240°C for foaming treatment for 20-40 minutes.

[0013] As a further embodiment of the present invention, the foaming agent is azodicarbonamide.

[0014] As a further solution of the present invention, the preparation method of the wear-resistant additive is as follows:

[0015] Disperse jute fiber in an ethanol solution with a volume fraction of 60-70%, then add a connector to the formed dispersion, after adding, raise the temperature to 70-80°C, keep warm and stir for 1-2 hours, then lower the temperature to 40-50°C, add magnesium hydroxide to the reaction solution, after adding, raise the temperature to 60-70°C, keep warm and stir for 4-8 hours, stop heating, cool and discharge, and the wear-resistant additive can be obtained.

[0016] As a further embodiment of the present invention, the length of the jute fiber is 1-2 mm.

[0017] In the above technical scheme, the connecting agent structure contains a large number of siloxane groups, which can be hydrolyzed under high temperature conditions to form silanol groups, and then condense with the hydroxyl groups on the surface of jute fiber and magnesium hydroxide, so as to fix the magnesium hydroxide on the surface of jute fiber to form jute fiber loaded with magnesium hydroxide, that is, wear-resistant additive.

[0018] As a further embodiment of the present invention, the preparation method of the linking agent is as follows:

[0019] Step S1, stirring and mixing tri(epoxypropyl)isocyanurate and toluene to form a reaction solution, then adding flame retardant FRC-6 and a phase transfer catalyst to the reaction solution, after adding, controlling the temperature to 60-70° C., keeping warm and stirring for 8-12 hours, evaporating to remove the solvent, cooling and discharging the material to obtain an intermediate;

[0020] Step S2, adding the intermediate to 1,4-dioxane, starting stirring, and after mixing evenly, introducing nitrogen protection, then adding isocyanatepropyltriethoxysilane and tin metal catalyst, after the addition is completed, heating to 70-80° C., and keeping warm for 2-4 hours to obtain a linker.

[0021] As a further embodiment of the present invention, in step S1, the phase transfer catalyst is boron trifluoride etherate complex.

[0022] As a further embodiment of the present invention, in step S1, the molar ratio of the flame retardant FRC-6 to tri(epoxypropyl)isocyanurate is 1:1-1.5.

[0023] As a further embodiment of the present invention, in step S2, the tin metal catalyst is stannous octoate or dibutyltin dilaurate.

[0024] As a further solution of the present invention, the antioxidant is a phosphite antioxidant; and the curing agent is polyamide.

[0025] A wear-resistant and highly elastic IXPE foam is prepared by adopting the preparation method.

[0026] Beneficial effects of the present invention:

[0027] The wear-resistant additive prepared by the present invention is jute fiber loaded with magnesium hydroxide, and the magnesium hydroxide and the jute fiber are connected by a connecting agent. On the one hand, after the connecting agent is connected, the magnesium hydroxide cannot be easily separated from the surface of the jute fiber. During the material friction process, the magnesium hydroxide can slide relatively on the surface of the jute fiber, producing a ball effect, thereby effectively improving the wear resistance of the material. In addition, the connecting agent is a macromolecular substance having an alternating structure of isocyanuric acid and flame retardant FRC-6, and containing a siloxane active functional group, which can quickly form an expanded carbon layer with silicon oxide when the material burns, and can quickly cover the surface of the material. At the same time, magnesium hydroxide can play its own advantages as an inorganic flame retardant, and cooperate with the connecting agent to prevent further combustion, thereby greatly improving the flame retardant performance of the material.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1This is the infrared analysis test diagram of the connecting agent in Preparation Example 1. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Preparation Example 1

[0033] Preparation of wear-resistant additives:

[0034] Step S1, 0.35 g of tri(epoxypropyl)isocyanurate and toluene are stirred and mixed uniformly to form a reaction solution, and then 0.3 g of flame retardant FRC-6 and 0.02 g of boron trifluoride ether complex are added to the reaction solution. After the addition, the temperature is controlled to 65° C., and after stirring for 9 hours, the solvent is evaporated and removed, and the temperature is lowered to obtain an intermediate;

[0035] Step S2, adding 0.2 g of the intermediate to 1,4-dioxane, stirring, and after mixing evenly, introducing nitrogen protection, and then adding 0.04 g of isocyanatepropyltriethoxysilane and 0.01 g of dibutyltin dilaurate. After the addition is complete, the temperature is raised to 75° C. and kept warm for 3 h to obtain a linker;

[0036] Figure 1 This is the infrared analysis test chart of the connector, where 3391cm -1 The absorption peak at 2800 cm is the characteristic absorption peak of hydroxyl group produced by ring-opening polymerization. -1 ~3000cm -1 The absorption peak at 1671cm is the characteristic absorption peak of carbon and hydrogen in the methyl and methylene structures. -1 The absorption peak at 1230 cm is the characteristic absorption peak of the carbon-oxygen double bond in the isocyanuric acid ring structure. -1 The absorption peak at 1087cm is the characteristic absorption peak of P=O. -1 The absorption peak appearing at is the characteristic absorption peak of the ether bond produced by the ring-opening polymerization reaction.

[0037] Step S3, dispersing 5g of jute fiber with a length of 1mm in an ethanol solution with a volume fraction of 70%, and then adding 0.6g of a connector to the formed dispersion. After the addition, the temperature is increased to 75°C, and after the mixture is kept warm and stirred for 2h, the temperature is lowered to 50°C, and 1.8g of magnesium hydroxide is added to the reaction solution. After the addition, the temperature is increased to 65°C, and after the mixture is kept warm and stirred for 6h, the heating is stopped, the temperature is lowered and the material is discharged, and the wear-resistant additive can be obtained.

[0038] Example 1

[0039] A wear-resistant and highly elastic IXPE foam is made of the following raw materials in parts by weight:

[0040]

[0041] The preparation method of the IXPE foam comprises the following steps:

[0042] The first step is to feed low-density polyethylene, ethylene-acetic acid copolymer and azodicarbonamide into a mixer, stir and mix at a speed of 1000 r / min for 15 minutes, then add polyamide into the mixer, continue stirring for 10 minutes, and then transfer the formed mixture into an extruder for extrusion granulation to obtain pellet 1;

[0043] Step 2: Add the wear-resistant additive, masterbatch and phosphite into a mixer, mix for 5 minutes at a stirring rate of 1000 r / min, and then transfer to an extruder for extrusion and granulation to obtain granule 2;

[0044] Step 3: Granules 1 and 2 are mixed evenly and then granulated to form a precursor material. The precursor material is placed in a temperature environment of 80°C for 20 minutes, and then extruded into a sheet at a temperature of 100°C. The radiation dose is then controlled to be 100KGy, and the formed sheet is electron irradiated to form a coil.

[0045] Step 4: Place the coil at 200°C for foaming treatment for 40 minutes.

[0046] The wear-resistant additive was prepared by the method of Preparation Example 1, and the same is true below.

[0047] Example 2

[0048] A wear-resistant and highly elastic IXPE foam is made of the following raw materials in parts by weight:

[0049]

[0050]

[0051] The preparation method of the IXPE foam comprises the following steps:

[0052] The first step is to feed low-density polyethylene, ethylene-acetic acid copolymer and azodicarbonamide into a mixer, stir and mix them at a speed of 1200 r / min for 10 minutes, then add polyamide into the mixer, continue stirring for 10 minutes, and then transfer the formed mixture into an extruder for extrusion granulation to obtain pellet 1;

[0053] Step 2: Add the wear-resistant additive, masterbatch and phosphite into a mixer, mix at a stirring rate of 800 r / min for 6 min, and then transfer to an extruder for extrusion and granulation to obtain granule 2;

[0054] Step 3: Granules 1 and 2 are mixed evenly and then granulated to form a precursor material. The precursor material is placed in a temperature environment of 80°C for 15 minutes, and then extruded into a sheet at a temperature of 110°C. The radiation dose is then controlled to be 100KGy, and the formed sheet is electron irradiated to form a coil.

[0055] Step 4: Place the coil in a temperature condition of 220°C for foaming treatment for 30 minutes.

[0056] Example 3

[0057] A wear-resistant and highly elastic IXPE foam is made of the following raw materials in parts by weight:

[0058]

[0059]

[0060] The preparation method of the IXPE foam comprises the following steps:

[0061] The first step is to feed low-density polyethylene, ethylene-acetic acid copolymer and azodicarbonamide into a mixer, stir and mix them at a speed of 1500 r / min for 10 minutes, then add polyamide into the mixer, continue stirring for 5 minutes, and then transfer the formed mixture into an extruder for extrusion granulation to obtain pellet 1;

[0062] Step 2: Add the wear-resistant additive, masterbatch and phosphite into a mixer, mix for 5 minutes at a stirring rate of 1000 r / min, and then transfer to an extruder for extrusion and granulation to obtain granule 2;

[0063] Step 3: Granules 1 and 2 are mixed evenly and then granulated to form a precursor material. The precursor material is placed in a temperature environment of 80°C for 20 minutes, and then extruded into a sheet at a temperature of 120°C. The radiation dose is then controlled to be 100KGy, and the formed sheet is electron irradiated to form a coil.

[0064] Step 4: Place the coil in a temperature condition of 240°C for foaming treatment for 20 minutes.

[0065] Comparative Example 1

[0066] A wear-resistant and highly elastic IXPE foam, which is different from Example 2 in that the wear-resistant additive is replaced by the connecting agent prepared in Preparation Example 1, and the rest remains unchanged.

[0067] Comparative Example 2

[0068] A wear-resistant and highly elastic IXPE foam, which is different from Example 2 in that the wear-resistant additive is removed and the rest remains unchanged.

[0069] Test Case

[0070] The IXPE foams in Examples 1 to 3 and Comparative Examples 1 to 2 were tested for wear resistance and flame resistance, and the results are recorded in Table 1:

[0071] Table 1 - Test results

[0072] Wear amount / g Limiting oxygen index / % Example 1 0.08 32.3 Example 2 0.06 32.6 Example 3 0.08 32.5 Comparative Example 1 0.21 30.9 Comparative Example 2 0.20 20.1

[0073] The wear test reference standard ASTM D3884, set the rotation speed to 60r / min, the load to 1000g, the grinding wheel to SC10, and the wear of the test sample after 5000 revolutions. The specific test method.

[0074] The limiting oxygen index test method refers to the standard GB / T 2406.2-2009.

[0075] The analysis and test results show that the use of the wear-resistant additive in Preparation Example 1 of the present invention as an additive can make the IXPE foam exhibit excellent wear resistance and flame retardancy, and the overall performance is more excellent.

[0076] After the wear-resistant additive was replaced with a connector, the wear resistance of the material decreased significantly due to the loss of the "ball" effect, and the flame retardant of the material decreased slightly due to the absence of the inorganic flame retardant magnesium hydroxide.

[0077] After completely removing the wear-resistant additive, it is obvious that the flame retardancy of the material is greatly reduced, and it is a flammable material.

[0078] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection 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 thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing wear-resistant and highly elastic IXPE foam, characterized in that: The IXPE foam is made of the following raw materials in parts by weight: The preparation method comprises the following steps: The first step is to feed low-density polyethylene, ethylene-acetic acid copolymer and foaming agent into a mixer, stir and mix at a speed of 1000-1500r / min for 10-15min, then add a curing agent into the mixer, continue stirring for 5-10min, and then transfer the formed mixture into an extruder for extrusion granulation to obtain pellet 1; Step 2: Add the wear-resistant additive, color masterbatch and antioxidant into the mixer, mix for 5-10 minutes at a stirring rate of 500-1000 r / min, and then transfer into the extruder for extrusion granulation to obtain pellet 2; Step 3: Evenly mix the pellets 1 and 2 and granulate them to form a precursor material. After placing the precursor material in a temperature environment of 80±5°C for 10-20 minutes, the precursor material is extruded into a sheet at a temperature of 100-120°C, and then the formed sheet is electron irradiated to form a coil. Step 4: Place the coiled material in a temperature condition of 200-240°C for foaming for 20-40 minutes; The preparation method of the wear-resistant additive is as follows: The jute fiber is dispersed in an ethanol solution with a volume fraction of 60-70%, and then a linker is added to the formed dispersion. After the addition, the temperature is increased to 70-80°C, and the mixture is stirred and kept warm for 1-2 hours, and then the temperature is reduced to 40-50°C. Magnesium hydroxide is then added to the reaction solution, and after the addition, the temperature is increased to 60-70°C, and the mixture is stirred and kept warm for 4-8 hours, and then the heating is stopped, and the material is cooled and discharged to obtain a wear-resistant additive. The preparation method of the linker is as follows: Step S1, catalyzing the flame retardant FRC-6 and tri(epoxypropyl)isocyanurate to undergo ring-opening polymerization under the action of a phase transfer catalyst to obtain an intermediate; Step S2: using a tin metal catalyst to catalyze the reaction between the intermediate and triethoxypropyl isocyanate silane to obtain a linker.

2. The method for preparing a wear-resistant and highly elastic IXPE foam according to claim 1, characterized in that: The foaming agent is azodicarbonamide.

3. The method for preparing a wear-resistant and highly elastic IXPE foam according to claim 1, characterized in that: The length of the jute fiber is 1-2 mm.

4. The method for preparing a wear-resistant and highly elastic IXPE foam according to claim 1, characterized in that: In step S1, the phase transfer catalyst is boron trifluoride etherate complex.

5. The method for preparing a wear-resistant and highly elastic IXPE foam according to claim 1, characterized in that: In step S1, the molar ratio of the flame retardant FRC-6 to tri(epoxypropyl)isocyanurate is 1:1-1.

5.

6. The method for preparing a wear-resistant and highly elastic IXPE foam according to claim 1, characterized in that: In step S2, the tin metal catalyst is stannous octoate or dibutyltin dilaurate.

7. The method for preparing a wear-resistant and highly elastic IXPE foam according to claim 1, characterized in that: The antioxidant is a phosphite antioxidant; and the curing agent is polyamide.

8. A wear-resistant and highly elastic IXPE foam, characterized in that: The method is prepared according to any one of claims 1 to 7.

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