Nylon composition, application thereof and foaming material

Abstract

The invention relates to the technical field of high polymer materials, in particular to a nylon composition, application thereof and a foaming material. The nylon composition disclosed by the invention is prepared by carrying out condensation polymerization reaction on polymeric monomers, wherein the polymeric monomers comprise caprolactam, hexamethylenediamine, decamethylene diamine, sebacic acid and dodecanedioic acid. The nylon composition disclosed by the invention is prepared through condensation polymerization reaction of polymeric monomers including caprolactam, hexamethylenediamine, decamethylene diamine, sebacic acid and dodecanedioic acid, has relatively high hardness, can be used as an additive of a foaming material, and forms a microscopic skeleton in a foamed product after foaming, so that the foaming performance of the foaming product is improved, and the service life of the foaming product is prolonged. The volume weight of a foamed product is reduced, and the foamed product still has excellent hardness.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a nylon composition and its application and a foaming material. Background Art

[0002] Foam materials such as PVC / NBR, PVC or EVA can be widely used as thermal insulation materials in cold water pipes, hot water pipes, and building insulation or to prevent heat dissipation after foaming; or as materials that come into contact with the human body, such as soles, insoles, yoga mats or seats, to improve user comfort and protection.

[0003] However, for foam materials such as PVC / NBR or PVC or EVA, as the bulk density (the ratio of the weight of the foamed product divided by the volume) decreases, the hardness will decrease with the decrease in bulk density, and the final hardness of the product will drop sharply. The compression resistance and the rebound performance after compression will decrease together with the hardness. This decrease in hardness will cause the terminal or downstream customers to have the following problems when using foam products with low bulk density: the product is easy to deform under the pressure of weight, or the thermal insulation effect is reduced after deformation, or it is difficult to cut during post-processing, or it is difficult to stick aluminum foil or other film materials, or the product is deformed due to insufficient hardness for human protection, and cannot provide sufficient comfort or protection for the human body. This decrease in hardness caused by the decrease in bulk density makes foam products with low bulk density or low hardness unacceptable to terminal or downstream users, and this problem has not been solved.

[0004] To ensure the hardness of foamed materials meets customer requirements, previous technical means of increasing the hardness of foamed materials were to produce materials with higher bulk density, or to increase the hardness by adding fillers, such as silica or carbon black. Another method was to use the hardening property of PVC due to thermal decomposition to adjust the hardness. This method was not very effective because the thermal decomposition of PVC cannot be precisely controlled, resulting in difficult to control hardness. In particular, it caused large variations in product quality, an increase in inferior, defective and waste products, and the final product became brittle and easily broke when bent at 0°C.

[0005] Therefore, there is an urgent need to develop an additive that can obtain a foamed material with low bulk density and high hardness. Summary of the Invention

[0006] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the present invention provides a nylon composition, its application, and a foamed material. The nylon composition of the present invention can be used as an additive to a foamed material to obtain a foamed material having both low bulk density and high hardness.

[0007] To this end, the first aspect of the present invention provides a nylon composition prepared by a condensation polymerization reaction of polymerized monomers;

[0008] The polymerizable monomers include:

[0009]

[0010]

[0011] The nylon composition of the present invention is prepared by condensation polymerization of monomers including caprolactam, hexamethylenediamine, decanediamine, sebacic acid, and dodecanedioic acid. The composition has high hardness and can be used as an additive for foaming materials. The nylon composition of the present invention has good compatibility with the raw materials for preparing the foaming material and forms a microscopic skeleton in the foamed product after foaming, so that the foamed material has excellent hardness while reducing the bulk density.

[0012] In some embodiments of the present invention, the polymerizable monomers include 0.8 mol of caprolactam, 1.2 mol of hexamethylenediamine, 0.2 mol of decanediamine, 0.3 mol of sebacic acid, and 0.9 mol of dodecanedioic acid.

[0013] In some embodiments of the present invention, the polymerizable monomers include 1.0 mol of caprolactam, 0.7 mol of hexamethylenediamine, 0.7 mol of decanediamine, 0.5 mol of sebacic acid, and 1.1 mol of dodecanedioic acid.

[0014] In some embodiments of the present invention, the polymerizable monomers include 1.2 mol of caprolactam, 0.2 mol of hexamethylenediamine, 1.2 mol of decanediamine, 0.6 mol of sebacic acid, and 1.3 mol of dodecanedioic acid.

[0015] In some embodiments of the present invention, the temperature of the condensation polymerization reaction is 260-300° C. Thus, the hardness of the nylon composition can be further increased.

[0016] The second aspect of the present invention provides the use of the nylon composition in improving the hardness of foamed materials.

[0017] In some embodiments of the present invention, the mass content of the nylon composition is 1%-10% based on the mass of the foamed material.

[0018] In some embodiments of the present invention, the raw materials for preparing the foaming material include one or more of nitrile rubber, polyvinyl chloride, ethylene-vinyl acetate copolymer, and polyurethane.

[0019] The third aspect of the present invention provides a foam material, which is made by extrusion molding and foaming molding of raw materials;

[0020] In parts by mass, the raw materials include:

[0021]

[0022] In some embodiments of the present invention, the nucleating agent includes one or more of talc powder, wollastonite powder, calcium carbonate powder, silicon dioxide powder, mica powder, and titanium dioxide powder.

[0023] In some embodiments of the present invention, the mesh size of the nucleating agent is 1000-2000 mesh.

[0024] In some embodiments of the present invention, the plasticizer includes one or more of phthalates, aliphatic dibasic acid esters, phosphates, epoxy plasticizers, and chlorinated paraffins.

[0025] In some embodiments of the present invention, the foaming agent includes one or more of azodicarbonamide (AC), 4,4'-oxybisbenzenesulfonylhydrazide (OBSH), sodium bicarbonate (NaHCO3), butyl nitrite (n-Butyl Nitrite), pentamethylenetetramine-H (HMT), and benzenesulfonylhydrazide (BZ).

[0026] In some embodiments of the present invention, the raw materials for preparing the foaming material further include one or more of a toughening agent, a heat stabilizer, a colorant, a lubricant, a vulcanization accelerator, and an activator.

[0027] In some embodiments of the present invention, the toughening agent includes one or more of chlorinated polyethylene (CPE), acrylic copolymers, and polyurethane toughening agents.

[0028] In some embodiments of the present invention, the heat stabilizer includes an organic tin substance; further, the organic tin substance includes one or more methyltin mercaptides.

[0029] In some embodiments of the present invention, the colorant comprises carbon black.

[0030] In some embodiments of the present invention, the lubricant includes one or more of stearic acid and its derivatives, polyethylene wax, and linear alkanes with 15-50 carbon atoms.

[0031] In some embodiments of the present invention, the vulcanization accelerator includes a thiazole accelerator and a thiuram accelerator.

[0032] In some embodiments of the present invention, the activator includes one or more of zinc oxide, zinc dimethyldithiocarbamate (PZ), zinc diethyldithiocarbamate (EZ), zinc di-n-butyldithiocarbamate (BZ), urea ester (BK), and fatty acid quaternary ammonium salt.

[0033] In some embodiments of the present invention, the extrusion molding temperature is 30-60°C.

[0034] In some embodiments of the present invention, the temperature of the foaming molding is 100-200°C.

[0035] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0037] Figure 1 A physical picture of the foamed material of Example 4 of the present invention is shown. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0039] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0040] The first aspect of the present invention provides a nylon composition prepared by condensation polymerization of polymerized monomers;

[0041] The polymerizable monomers include:

[0042]

[0043] The nylon composition of the present invention is prepared by condensation polymerization of monomers including caprolactam, hexamethylenediamine, decanediamine, sebacic acid, and dodecanedioic acid. The composition has high hardness and can be used as an additive for foaming materials. The nylon composition of the present invention has good compatibility with the raw materials for preparing the foaming material and forms a microscopic skeleton in the foamed product after foaming, so that the foamed material has excellent hardness while reducing the bulk density.

[0044] In some embodiments of the present invention, the nylon composition has a processing temperature of 10°C to 70°C on a slurry mill; a processing temperature of 30°C to 65°C during extrusion molding; a processing temperature of 110°C to 190°C during foaming in a hot furnace; and a maximum temperature in summer not exceeding 45°C, and does not soften in the air.

[0045] In some embodiments of the present invention, the peak crystallization temperature (Tp) of the nylon composition during the temperature increase process measured by differential scanning calorimetry (DSC) is 50-80°C.

[0046] In some embodiments of the present invention, the terminal crystallization temperature (Tm) of the nylon composition measured by differential scanning calorimetry is 120-140°C.

[0047] Specifically, when the nylon material changes from a crystalline state to an amorphous (non-crystalline) state, it absorbs heat. When a peak appears on the DSC curve, that is, the peak crystallization temperature (Tp), the nylon material is still partially crystalline in this state. When the nylon material completely enters the amorphous (non-crystalline) state, it is the termination crystallization temperature (Tm).

[0048] As an example, the polymerized monomers may include 0.8, 0.9, 1.0, 1.1, or 1.2 mol of caprolactam.

[0049] As an example, the polymerized monomer may include 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, or 1.2 mol of hexamethylenediamine.

[0050] As an example, the polymerized monomer may include 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, or 1.2 mol of decanediamine.

[0051] As an example, the polymerized monomers may include 0.3, 0.4, 0.5, or 0.6 mol of sebacic acid.

[0052] As an example, the polymerized monomers may include 0.9, 1.0, 1.1, 1.2, or 1.3 mol of dodecanedioic acid.

[0053] In some embodiments of the present invention, the polymerizable monomers include 0.8 mol of caprolactam, 1.2 mol of hexamethylenediamine, 0.2 mol of decanediamine, 0.3 mol of sebacic acid, and 0.9 mol of dodecanedioic acid.

[0054] In some embodiments of the present invention, the polymerizable monomers include 1.0 mol of caprolactam, 0.7 mol of hexamethylenediamine, 0.7 mol of decanediamine, 0.5 mol of sebacic acid, and 1.1 mol of dodecanedioic acid.

[0055] In some embodiments of the present invention, the polymerizable monomers include 1.2 mol of caprolactam, 0.2 mol of hexamethylenediamine, 1.2 mol of decanediamine, 0.6 mol of sebacic acid, and 1.3 mol of dodecanedioic acid.

[0056] In some embodiments of the present invention, the condensation polymerization reaction temperature is 260-300° C. As an example, the condensation polymerization reaction temperature can be 260, 265, 270, 275, 280, 285, 290, 295, or 300° C. This can further increase the hardness of the nylon composition.

[0057] In some embodiments of the present invention, the condensation polymerization reaction is carried out under stirring; further, the stirring speed is 300-400 r / min. As an example, the stirring speed can be 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, or 400 r / min. This can further increase the hardness of the nylon composition.

[0058] The second aspect of the present invention provides the use of the nylon composition in improving the hardness of foamed materials.

[0059] In some embodiments of the present invention, the weight content of the nylon composition is 1%-10% based on the weight of the foamed material. For example, the weight content of the nylon composition can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% based on the weight of the foamed material.

[0060] In some embodiments of the present invention, the raw materials for preparing the foaming material include one or more of nitrile rubber, polyvinyl chloride, ethylene-vinyl acetate copolymer, and polyurethane.

[0061] The third aspect of the present invention provides a foam material, which is made by extrusion molding and foaming molding of raw materials;

[0062] In parts by mass, the raw materials include:

[0063]

[0064] In some embodiments of the present invention, the Mooney viscosity of the nitrile rubber is 70-90 Pa·s.

[0065] In some embodiments of the present invention, the average degree of polymerization of the polyvinyl chloride is 650-750.

[0066] In some embodiments of the present invention, the nucleating agent includes one or more of talc powder, wollastonite powder, calcium carbonate powder, silicon dioxide powder, mica powder, and titanium dioxide powder.

[0067] In some embodiments of the present invention, the mesh size of the nucleating agent is 1000-2000 mesh. As an example, the mesh size of the nucleating agent can be 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, or 2000 mesh.

[0068] In some embodiments of the present invention, the plasticizer includes one or more of phthalates, aliphatic dibasic acid esters, phosphates, epoxy plasticizers, and chlorinated paraffins.

[0069] In some embodiments of the present invention, the phthalate esters include one or more of dioctyl phthalate (DOP), diisodecyl phthalate (DIDP), and diisononyl phthalate (DINP).

[0070] In some embodiments of the present invention, the aliphatic dibasic acid ester substance includes one or more of dioctyl adipate (DOA) and dioctyl sebacate (DOS).

[0071] In some embodiments of the present invention, the phosphate ester substance includes one or more of triphenyl phosphate (TPP) and tricresyl phosphate (TCP).

[0072] In some embodiments of the present invention, the epoxy compound plasticizer includes one or more of epoxidized soybean oil (ESO) and epoxy tetrahydrophthalate (EPS).

[0073] In some embodiments of the present invention, the chlorinated paraffin includes one or more of chlorinated paraffin-42, chlorinated paraffin-52, and chlorinated paraffin-60. The structure of chlorinated paraffin-52 is shown below:

[0074]

[0075] In some embodiments of the present invention, the foaming agent includes one or more of azodicarbonamide (AC), 4,4'-oxybisbenzenesulfonylhydrazide (OBSH), sodium bicarbonate (NaHCO3), butyl nitrite (n-Butyl Nitrite), pentamethylenetetramine-H (HMT), and benzenesulfonylhydrazide (BZ).

[0076] In some embodiments of the present invention, the vulcanizing agent includes sulfur; further, the vulcanizing agent also includes a dispersing aid; the dispersing aid includes a rubber elastic carrier (such as ethylene propylene diene monomer (EPDM) or (ethylene-vinyl acetate copolymer EVA)).

[0077] In some embodiments of the present invention, the vulcanizing agent comprises vulcanizing agent S-80.

[0078] In some embodiments of the present invention, the raw materials for preparing the foaming material further include one or more of a toughening agent, a heat stabilizer, a colorant, a lubricant, a vulcanization accelerator, and an activator.

[0079] In some embodiments of the present invention, the toughening agent includes one or more of chlorinated polyethylene (CPE), acrylic copolymers, and polyurethane toughening agents.

[0080] In some embodiments of the present invention, the raw materials for preparing the foaming material include 1-2 parts of toughening agent by mass.

[0081] In some embodiments of the present invention, the heat stabilizer includes an organic tin substance; further, the organic tin substance includes one or more methyltin mercaptides.

[0082] In some embodiments of the present invention, the raw materials for preparing the foaming material include 1-2 parts of a heat stabilizer by mass.

[0083] In some embodiments of the present invention, the colorant comprises carbon black.

[0084] In some embodiments of the present invention, the raw materials for preparing the foaming material include 1-5 parts of colorant by mass.

[0085] In some embodiments of the present invention, the lubricant includes one or more of stearic acid and its derivatives, polyethylene wax, and linear alkanes with 15-50 carbon atoms.

[0086] In some embodiments of the present invention, the raw materials for preparing the foaming material include 1-5 parts of lubricant by mass.

[0087] In some embodiments of the present invention, the vulcanization accelerator includes a thiazole accelerator and a thiuram accelerator.

[0088] In some embodiments of the present invention, the thiuram-based accelerator comprises dipentamethylenethiuram tetrasulfide (DPTT).

[0089] In some embodiments of the present invention, the raw materials for preparing the foaming material include 0.1-1 parts by mass of a vulcanization accelerator.

[0090] In some embodiments of the present invention, the activator includes one or more of zinc oxide, zinc dimethyldithiocarbamate (PZ), zinc diethyldithiocarbamate (EZ), zinc di-n-butyldithiocarbamate (BZ), urea ester (BK), and fatty acid quaternary ammonium salt.

[0091] In some embodiments of the present invention, the raw materials for preparing the foaming material include 1-2 parts of an activator by mass.

[0092] In some embodiments of the present invention, the raw materials are mixed and then extruded.

[0093] In some embodiments of the present invention, the mixing temperature is 140-160° C. As an example, the mixing temperature can be 140, 145, 150, 155, or 160° C.

[0094] In some embodiments of the present invention, the extrusion molding temperature is 30-60° C. As an example, the extrusion molding temperature can be 30, 35, 40, 45, 50, 55, or 60° C.

[0095] In some embodiments of the present invention, the foaming temperature is 100-200° C. As an example, the foaming temperature can be 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, or 200° C.

[0096] In some embodiments of the present invention, the foam molding specifically includes: subjecting the raw materials to a first foaming treatment, a second foaming treatment, and a third foaming treatment in sequence; the first foaming treatment is carried out at a temperature of 100-130° C.; the second foaming treatment is carried out at a temperature of 140-160° C.; and the third foaming treatment is carried out at a temperature of 170-200° C.;

[0097] The term "condensation polymerization" in this context, also referred to as polycondensation, refers to the condensation reaction of one or more monomers to form a polymer. The main product is called a polycondensate. The monomers in a condensation polymerization reaction are compounds with two (or more) reactive functional groups. During polymerization, small molecules are removed to form a polymer. Therefore, the molecular weight of the repeating structural unit of the polymer is smaller than that of the monomer.

[0098] The term "melting temperature" of the present invention refers to the temperature at which an object begins to change from a solid state to a liquid state.

[0099] The scheme of the present disclosure will be explained below in conjunction with the examples. Those skilled in the art will understand that the following examples are only used to illustrate the present disclosure and should not be considered to limit the scope of the present disclosure. Where specific techniques or conditions are not specified in the examples, they are carried out according to the techniques or conditions described in the literature in this area or according to the product instructions. Where the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be obtained commercially.

[0100] The nitrile rubber (NBR) used in the examples and comparative examples of the present invention is a high molecular weight NBR, model NBR3308 of Lanzhou Petrochemical; the polyvinyl chloride (PVC) is a low molecular weight PVC, specification 700, model S-700 of Qilu Petrochemical; the chlorinated polyethylene (CPE) is purchased from Shandong Bangtai Petrochemical, model 135A; the methyl tin mercaptan is Yunxi brand, brand YT-181; the talc powder is purchased with a mesh number of 1250 mesh; the carbon black is carbon black N550; the wollastonite powder is purchased from Hebei Hezhen Technology Co., Ltd., with a mesh number of 1250 mesh; the plate wax is a straight-chain alkane with a carbon number of 20; the structure of chlorinated paraffin-52 is as follows:

[0101]

[0102] 1. Nylon composition

[0103] Example 1

[0104] The preparation method of the nylon composition of this embodiment includes the following steps:

[0105] 1) Prepare caprolactam, hexamethylenediamine, decanediamine, sebacic acid and dodecanedioic acid according to the amount of each monomer in Table 1, put them into a high-speed stirrer and mix them at high speed to obtain a blended material;

[0106] 2) The blended material is fed into a co-rotating twin-screw extruder through a feeding device at a speed of 300-350 r / min and a temperature of 260-270° C., melt-mixed and then extruded, pelletized and packaged to obtain a nylon composition.

[0107] Table 1

[0108]

[0109]

[0110] Example 2

[0111] The preparation method of the nylon composition of this embodiment includes the following steps:

[0112] 1) Prepare caprolactam, hexamethylenediamine, decanediamine, sebacic acid and dodecanedioic acid according to the amount of each monomer in Table 1, put them into a high-speed stirrer and mix them at high speed to obtain a blended material;

[0113] 2) The blended material is fed into a co-rotating twin-screw extruder through a feeding device at a speed of 350-400 r / min and a temperature of 260-270° C., melt-mixed and then extruded, pelletized and packaged to obtain a nylon composition.

[0114] Example 3

[0115] The preparation method of the nylon composition of this embodiment includes the following steps:

[0116] 1) Prepare caprolactam, hexamethylenediamine, decanediamine, sebacic acid and dodecanedioic acid according to the amount of each monomer in Table 1, put them into a high-speed stirrer and mix them at high speed to obtain a blended material;

[0117] 2) The blended material is fed into a co-rotating twin-screw extruder through a feeding device at a speed of 350-400 r / min and a temperature of 270-280° C., melt-mixed and then extruded, pelletized and packaged to obtain a nylon composition.

[0118] 2. Foaming materials

[0119] Example 4

[0120] The foaming material of this embodiment (physical figure as shown in FIG. Figure 1 As shown), the nylon composition prepared in Example 2 is used as a raw material, and the preparation method comprises the following steps:

[0121] (1) Prepare the raw materials according to the formula in Table 2.

[0122] Table 2

[0123]

[0124]

[0125] (2) Mixing the raw materials prepared according to the formula

[0126] The raw materials were placed in a 110L internal mixer with a filling factor of 100% (filling factor = (actual filling material volume / internal mixer working volume) × 100%, specifically calculated as follows: the total mass of the raw materials divided by the density of the raw materials, and then divided by the working volume of the internal mixer). After the raw materials were placed in the internal mixer, the timing began when the top bolt on the equipment was pressed down. The total mixing time was 12 minutes. The actual measured temperature of the mixed material after the materials were added was 145°C.

[0127] (3) The mixture is formed into sheets using a milling machine.

[0128] The material kneaded in step (2) is primarily cooled and mixed in an open kneading machine, and the cut material is fed into the guide wheel at the upper end of the drum, and then rolled into sheets. When the material temperature drops to 55°C, it is cut into a specific width of 50 cm and then fed to a cooling conveyor belt. After cooling, it is cut into specific lengths and then stacked for storage.

[0129] (4) Add vulcanizing agent, vulcanization accelerator and foaming agent to the training machine

[0130] 70 kg of the sheet mixture from step (3) was taken and put into an open mill. The blowing agent (azodicarbonamide), vulcanizing agent (vulcanizing agent S80), vulcanization accelerator (dipentamethylenethiuram tetrasulfide) and activator (zinc oxide and zinc dimethyldithiocarbamate) listed in Table 3 were then added. After all the raw materials were preliminarily mixed, the cut material was put into the guide wheel at the upper end of the drum for mechanical mixing. After mixing, the material was cut into strips. The mass contents of the components in Table 3 are based on the mass of the sheet mixture. For example, the mass content of the blowing agent (azodicarbonamide) is 6.50% based on the mass of the sheet mixture.

[0131] Table 3

[0132] Components Mass content Azodicarbonamide 6.50％ Dipentamethylenethiuram tetrasulfide 0.30％ zinc oxide 1.00％ Zinc dimethyldithiocarbamate 1.00％ Curing agent S80 0.36％

[0133] (5) Extrusion molding in an extruder

[0134] The strip-shaped mixed material of step (4) was fed into the feed port of the extruder and extruded into a specific plate-shaped material for 5 minutes. The extruder conditions were set as follows:

[0135] #1: 44℃; #2: 50℃, vacuum 30℃; #3: 44℃; die: 50℃; screw: 33℃.

[0136] When making 14mm plate, after the outer die and inner die of the extruder die head are combined, the gap between the inner diameter of the outer die and the outer diameter of the inner die is 3mm-3.3mm.

[0137] When making 24mm plate, after the outer die and inner die of the extruder die head are combined, the gap between the inner diameter of the outer die and the outer diameter of the inner die is 5.4mm-5.8mm.

[0138] (6) Foaming in a foaming furnace

[0139] The extruded material of step (5) is fed into the hot furnace by the guide wheel. No foaming occurs in zones 1 and 2. The surface of the material is first vulcanized. After being immersed in zone 3, foaming begins. A large amount of foaming occurs in zone 6. The speed of the guide wheel is first slow and then fast to cope with the volume change during foaming. At the same time, the temperature of each section of the hot furnace is controlled to achieve a finished product with a skin on the surface and uniform foaming inside. After leaving the hot furnace, it is cooled and cut on a conveyor belt.

[0140] The conditions of each temperature zone of the foaming furnace are set as follows:

[0141] #1: 120℃; #2: 130℃; #3: 140℃; #4: 150℃; #5: 160℃; #6: 170℃; #7: 176℃; #8: 185℃.

[0142] Guide wheel speed of each temperature zone of the foaming furnace:

[0143] #1 front: 1820mm / min, #1 rear: 1820mm / min; #2 front: 1820mm / min, #2 rear: 1810mm / min; #3 front: 1830mm / min, #3 rear: 1830mm / min; #4 front: 2720mm / min, #4 rear: 2720mm / min; #5 front: 3000mm / min, #5 rear: 4320mm / min; #6 front: 4730mm / min, #6 rear: 6430mm / min; #7 front: 9650mm / min, #7 rear: 17200mm / min.

[0144] Example 5

[0145] The method for preparing the foaming material of this embodiment differs from that of Example 4 only in that, in step (4), the foaming agent (azodicarbonamide), the vulcanizing agent (vulcanizing agent S80), the vulcanization accelerator (dipentamethylenethiuram tetrasulfide), and the activator (zinc oxide and zinc dimethyldithiocarbamate) are added to the open mill using the formulation of Table 4; the remaining steps are carried out with reference to the method of Example 4.

[0146] Table 4

[0147] Components Mass content Azodicarbonamide 6.50％ Dipentamethylenethiuram tetrasulfide 0.20％ zinc oxide 0.90％ Zinc dimethyldithiocarbamate 0.90％ Curing agent S80 0.30％

[0148] Example 6

[0149] The method for preparing the foaming material of this embodiment is different from that of Example 5 only in that this embodiment adopts the formulation of Table 5 for preparing the ingredients; the remaining steps are carried out in accordance with the method of Example 5.

[0150] Table 5

[0151]

[0152]

[0153] Comparative Example 1

[0154] The preparation method of the foaming material in this comparative example is different from that in Example 4 only in that the nylon composition is omitted in this comparative example, and the remaining raw materials are prepared using the formula in Table 6; the remaining steps are carried out according to the method in Example 4.

[0155] Table 6

[0156] Components Mass content Components Mass content Nitrile rubber 8.6％ Carbon Black N550 2.3％ polyvinyl chloride 20.0％ stearic acid 0.2％ Chlorinated polyethylene 1.4％ wax board 1.3％ / / Epoxidized soybean oil 0.3％ Methyltin mercaptan 0.7％ Chlorinated paraffin-52 25.2％ talcum powder 28.6％ Azodicarbonamide 11.4％

[0157] Test Case

[0158] 1.1 Check the mixture at the starter end

[0159] Project 1: When the mixture after dense mixing is operated on the mixing machine (double drum), the mixture needs to be completely attached to the drum and cannot fall off or bulge. When cutting and removing the material from the drum, the material must be easy to remove and not too sticky.

[0160] Project 2: The mixed material is cut into strips on the mill and thrown onto the guide wheel above the mill. The material cannot be broken.

[0161] 1.2 Finished product inspection after the product comes out of the hot oven

[0162] Item 3: Inspection of finished products. There should not be any cracks.

[0163] Item 4: Measure bulk density of finished products. The bulk density of plate materials is less than 40.

[0164] The bulk density test procedure is to cut the finished product, measure the length, width and thickness to calculate the volume, then measure the mass of the sample and divide the mass by the volume to get the bulk density.

[0165] 1.3 Customer Feedback

[0166] Project 5: After the films were mixed in the mixer and left for 48 hours, the unfoamed films of Examples 4-6 and Comparative Example 1 were subjected to hardness testing. Hardness testing method: Using an HTS-800C digital Shore C hardness tester, the hardness value was read after pressing for 15 seconds.

[0167] Item 6: Comparison of the resilience of the products of Examples 4-6 and Comparative Example 1 at the same bulk density.

[0168] Rebound resilience test method: Take a sample with a width of 10mm and a length of 120mm, mark a length of 60mm in the center of the sample and make a mark, lengthen it to 200mm and stay for 15 minutes, release it, let the sample rebound, and after staying for 4 minutes, measure the marked length. Divide the marked length measured after rebound by 60mm to get the percentage. The higher the percentage, the worse the rebound resilience, because the closer the marked length is to 60mm, the better the rebound effect.

[0169] Item 7: Customer response on whether it is easy to cut.

[0170] 1.5 Test Results

[0171] Project 1: The mixture of Examples 4-6 was placed on a drum and mixed for 5 minutes. The mixture was completely attached to the drum without bulging or falling off.

[0172] Project 2: The mixed material of Example 4-6 was cut on the drum and put into the guide wheel. After 5 minutes of observation, no breakage was found.

[0173] Item 3: The finished products of Examples 4-6 did not have any cracks.

[0174] Project 4: Finished product bulk density test, the results are shown in Table 7.

[0175] Table 7

[0176] formula Example 4 Example 5 Example 6 <![CDATA[Bulk density (g / cm 3 )]]> 34 36 37

[0177] Project 5: Hardness test

[0178] The plastic sheets of Example 4 and Comparative Example 1 were completely mixed in a mixer and cooled for 48 hours, and then samples were taken to measure the hardness.

[0179] Hardness of the plastic sheet of Example 4: Shore C 72

[0180] Hardness of the plastic sheet of Comparative Example 1: Shore C 63

[0181] Project 6: Resilience Test

[0182] The finished products of Example 4 and Comparative Example 1 were tested for their resilience.

[0183] Resilience of the finished product of Example 4: 114%

[0184] The rebound resilience of the finished product of Comparative Example 1: 134%

[0185] Project 7: Customers who cooperated with the test reported that the product was easy to cut.

[0186] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", "some implementation plans" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0187] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A nylon composition, characterized in that Prepared by condensation polymerization of polymerized monomers; The polymerizable monomers include:

2. The nylon composition according to claim 1, characterized in that The polymerization monomers include 0.8 mol of caprolactam, 1.2 mol of hexamethylenediamine, 0.2 mol of decanediamine, 0.3 mol of sebacic acid and 0.9 mol of dodecanedioic acid; Alternatively, the polymerizable monomers include 1.0 mol of caprolactam, 0.7 mol of hexamethylenediamine, 0.7 mol of decanediamine, 0.5 mol of sebacic acid, and 1.1 mol of dodecanedioic acid; Alternatively, the polymerizable monomers include 1.2 mol of caprolactam, 0.2 mol of hexamethylenediamine, 1.2 mol of decanediamine, 0.6 mol of sebacic acid, and 1.3 mol of dodecanedioic acid.

3. The nylon composition according to claim 1, wherein The temperature of the condensation polymerization reaction is 260-300°C.

4. Use of the nylon composition according to any one of claims 1 to 3 in increasing the hardness of a foamed material.

5. The use according to claim 4, characterized in that Based on the mass of the foamed material, the mass content of the nylon composition is 1%-10%.

6. The use according to claim 4, characterized in that The raw materials for preparing the foaming material include one or more of nitrile rubber, polyvinyl chloride, ethylene-vinyl acetate copolymer, and polyurethane.

7. A foaming material, characterized in that: It is made by extrusion molding and foaming molding of raw materials; In parts by mass, the raw materials include:

8. The foam material according to claim 7, characterized in that The nucleating agent includes one or more of talc powder, wollastonite powder, calcium carbonate powder, silicon dioxide powder, mica powder, and titanium dioxide powder; And / or, the plasticizer includes one or more of phthalates, aliphatic dibasic acid esters, phosphates, epoxy plasticizers, and chlorinated paraffins; And / or, the foaming agent includes one or more of azodicarbonamide, 4,4'-oxybisbenzenesulfonylhydrazide, sodium bicarbonate, butyl nitrite, pentamethylenetetramine-H, and benzenesulfonylhydrazide.

9. The foam material according to claim 7, characterized in that The raw materials for preparing the foaming material further include one or more of a toughening agent, a heat stabilizer, a colorant, a lubricant, a vulcanization accelerator, and an activator; Furthermore, the toughening agent includes one or more of chlorinated polyethylene, acrylic copolymer, and polyurethane toughening agent; Furthermore, the heat stabilizer includes an organic tin substance; further, the organic tin substance includes one or more of methyltin mercaptides; Further, the colorant includes carbon black; Furthermore, the lubricant includes one or more of stearic acid and its derivatives, polyethylene wax, and linear alkanes with a carbon number of 15-50; Furthermore, the activator includes one or more of zinc oxide, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc di-n-butyldithiocarbamate, urea ester, and fatty acid quaternary ammonium salt; Furthermore, the vulcanization accelerator includes a thiazole accelerator and a thiuram accelerator.

10. The foam material according to claim 7, characterized in that The extrusion molding temperature is 30-60°C; And / or, the temperature of the foaming molding is 100-200°C.

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