High-wear-resistance TPR thermoplastic elastomer and preparation method thereof

Abstract

The invention relates to the technical field of rubber elastomers, and discloses a high-wear-resistance TPR thermoplastic elastomer and a preparation method thereof. The high-wear-resistance TPR thermoplastic elastomer is prepared from the following components in parts by weight: 100 parts of SBS (Styrene Butadiene Styrene) copolymer, 30 to 60 parts of nylon 6, 2 to 10 parts of hyperbranched triazinyl aromatic polyamide, 0.3 to 1.6 parts of maleic anhydride grafted SBS and the like. The hyperbranched triazinyl aromatic polyamide has good compatibility with the SBS styrene-butadiene-styrene copolymer and the nylon 6, and is uniformly dispersed in a thermoplastic elastomer matrix of the SBS styrene-butadiene-styrene copolymer and the nylon 6, so that the tensile strength, the Shore A hardness, the wear resistance and the like of the material are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber elastomers, in particular to a highly wear-resistant TPR thermoplastic elastomer and a preparation method thereof. Background Art

[0002] TPE thermoplastic elastomer, also known as artificial rubber or synthetic rubber, has become a new material to replace traditional rubber due to its advantages of environmental protection, non-toxicity, high elasticity, good aging resistance, and convenient processing. It is widely used in industrial production and daily life. SBS styrene-butadiene styrene copolymer is a copolymer formed by the polymerization of styrene and butadiene monomers. It has good oil resistance, good heat resistance, strong adhesion, etc., and is widely used.

[0003] Combining SBS styrene-butadiene styrene copolymer with nylon, polypropylene, polyvinyl chloride, etc., a composite material with excellent performance is obtained. For example, patent CN101629013B discloses a plastic alloy of high impact toughness PPE and PA66 and its preparation method. The obtained plastic alloy has good impact toughness using polyphenylene ether resin PPE, nylon 66, thermoplastic elastomer, SBS compatibilizer, etc. as raw materials. Hyperbranched polymers such as hyperbranched polyaramide, hyperbranched polyester, hyperbranched polyurethane, etc. have highly branched three-dimensional molecular chain structures, unique mechanical properties and abundant terminal functional groups, and are widely used in toughening and modification of materials such as nylon, rubber, and polypropylene. Summary of the invention

[0004] (I) Technical problems to be solved: In view of the deficiencies in the prior art, the present invention provides a TPR thermoplastic elastomer with high wear resistance and mechanical properties and a preparation method.

[0005] (II) Technical solution: A highly wear-resistant TPR thermoplastic elastomer, comprising: 15-25 parts by weight of SBS styrene-butadiene styrene copolymer, 10-20 parts by weight of filler oil, 15-30 parts by weight of mineral filler, 10-20 parts by weight of compatibilizer, 10-20 parts by weight of monomer resin, and 0.1-1 parts by weight of antioxidant.

[0006] Preferably, the filler oil is white oil, and the mineral filler is any one or a combination of barium sulfate, calcium carbonate and talc.

[0007] Preferably, the compatibilizer is any one or a combination of maleic anhydride grafted SEBS and maleic anhydride grafted POE.

[0008] Preferably, the antioxidant is any one or a combination of antioxidant 1010, antioxidant 1076, and antioxidant 168.

[0009] Preferably, the monomer resin is EASTMAN monomer resin Kristalex5140.

[0010] Preferably, the preparation method of the highly wear-resistant TPR thermoplastic elastomer is: SBS styrene-butadiene styrene copolymer, filler oil, mineral filler, compatibilizer, monomer resin, and antioxidant are added to a twin-screw extruder for melt extrusion, and then molded in a flat vulcanizer to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0011] Preferably, the TPR thermoplastic elastomer also includes: 100 parts by weight of SBS styrene-butadiene styrene copolymer, 30-60 parts by weight of nylon 6, 2-10 parts by weight of hyperbranched triazine polyaramid, 0.3-1.6 parts by weight of maleic anhydride grafted SBS, 0.6-0.8 parts by weight of antioxidant, 1.4-1.8 parts by weight of stearic acid, and 10-25 parts by weight of filler oil.

[0012] Preferably, the preparation method of the hyperbranched triazine-based polyaromatic amide is:

[0013] (1) Add toluene, 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine, 4-nitrobenzeneboric acid, sodium hydroxide, and di(triphenylphosphine)palladium dichloride to a reaction flask in a molar ratio of 1:(2.8-3.6):(5-7):(0.02-0.026), heat to 100-110°C, condense and reflux for 2-3 hours, filter and concentrate the filtrate under reduced pressure, wash with water, add the product to ethanol, add Pd / C catalyst and hydrazine hydrate solution, heat to 80-85°C, condense and reflux for 5-10 hours, filter and purify by recrystallization to obtain 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine; the reaction formula is:

[0014]

[0015] (2) Add N-methylpyrrolidone, pyridine, 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine in a molar ratio of 1:(1.8-2) and triphenyl phosphite to the reaction kettle, introduce nitrogen, heat to 115-125°C, react for 3-6 hours, cool, add ethanol aqueous solution, filter, wash with ethanol, and dry to obtain hyperbranched triazine-based polyarylamide. The reaction formula is:

[0016]

[0017] (III) Beneficial technical effects: The TPR thermoplastic elastomer prepared by the present invention using SBS styrene-butadiene styrene copolymer, white oil, calcium carbonate, talcum powder and other mineral fillers, maleic anhydride grafted SBS compatibilizer, monomer resin and the like as raw materials has good tensile properties and hardness.

[0018] Furthermore, the present invention uses 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine and 4-nitrobenzeneboric acid as raw materials to prepare a novel AB2 monomer 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine, and then obtains a hyperbranched triazine-based polyaromatic amide through a self-condensation reaction.

[0019] The invention uses SBS styrene-butadiene styrene copolymer and nylon 6 as the base material of TPR thermoplastic elastomer, uses hyperbranched triazine-based polyaramid as the additive, and uses maleic anhydride grafted SBS as the compatibilizer. The hyperbranched triazine-based polyaramid contains a polyamide molecular chain structure and has good compatibility with nylon 6. The hyperbranched triazine-based polyaramid contains terminal amino groups and can react with the anhydride groups of the maleic anhydride grafted SBS, so that the hyperbranched triazine-based polyaramid also has good compatibility with the SBS styrene-butadiene styrene copolymer. The hyperbranched triazine-based polyaramid can be uniformly dispersed in the thermoplastic elastomer matrix of the SBS styrene-butadiene styrene copolymer and nylon 6, and the tensile strength, elongation at break and Shore A hardness of the elastomer material are significantly improved.

[0020] The invention adds hyperbranched triazine-based polyaromatic amide to a base material of a thermoplastic elastomer, thereby reducing the Akron abrasion loss of the elastomer material and improving the wear resistance. The hyperbranched triazine-based polyaromatic amide contains a phenyl-s-triazine structure with structural stability, has strong heat resistance, is not easy to be thermally decomposed, and is beneficial to improving the heat resistance of the elastomer material. After high-temperature heat treatment, the material still has a low Akron abrasion loss and maintains good wear resistance. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the invention more clear, the invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the invention and are not used to limit the invention.

[0022] Pd / C catalyst, palladium content 10%, Wuhan Smec Biotechnology Co., Ltd.

[0023] The preparation method of 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine is as follows: in an ice bath, add 10 mL of acetone, 10 mmol of cyanuric chloride, 20 mmol of sodium hydroxide, 10 mmol of 4-hydroxybenzoic acid, and 10 mL of water to a reaction bottle, react for 3 hours, and after the reaction, add hydrochloric acid solution dropwise for acidification, precipitate, filter, wash with water, and dry to obtain 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine. The structural formula is

[0024] The preparation method of maleic anhydride grafted SBS is as follows: add 30 mL of tetrahydrofuran, 1 g of SBS styrene-butadiene styrene copolymer into a reaction bottle, dropwise add 0.7 g of maleic anhydride and 0.05 g of dibenzoyl peroxide, heat to 65°C, condense and reflux for 8 hours, add ethanol after cooling, filter and wash with ethanol, extract and purify with acetone, and dry to obtain maleic anhydride grafted SBS.

[0025] Embodiment 1:

[0026] 150g SBS styrene-butadiene styrene copolymer, 200g white oil, 150g barium sulfate, 100g compatibilizer maleic anhydride grafted SEBS, 120g EASTMAN monomer resin Kristalex5140, and 1g antioxidant 1010 are added to a twin-screw extruder for melt extrude, and then molded in a flat vulcanizer at 160°C for 15min and a pressure of 10MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0027] Embodiment 2:

[0028] 250g SBS styrene-butadiene styrene copolymer, 160g white oil, 220g talcum powder, 200g compatibilizer maleic anhydride grafted SEBS, 200g EASTMAN monomer resin Kristalex5140, and 10g 1076 are added to a twin-screw extruder for melt extrude, and then molded in a flat vulcanizer at 160°C for 15min and a pressure of 10MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0029] Embodiment 3:

[0030] 200g SBS styrene-butadiene styrene copolymer, 100g white oil, 300g calcium carbonate, 120g compatibilizer maleic anhydride grafted SEBS, 100g EASTMAN monomer resin Kristalex5140, and 4g antioxidant 1010 are added to a twin-screw extruder for melt extrude, mixed at 160°C for 20min, and then molded in a flat vulcanizer at 160°C for 15min and a pressure of 10MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0031] The tensile properties are tested according to GB / T528-2009 method.

[0032] The hardness is tested according to GB / T 531.1-2008 method.

[0033] Table 1

[0034]

[0035] The present invention also provides the following embodiments.

[0036] Example 4

[0037] (1) Add 30 mL of toluene, 3 mmol of 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine, 8.4 mmol of 4-nitrobenzeneboric acid, 21 mmol of sodium hydroxide, and 0.066 mmol of di(triphenylphosphine)palladium dichloride into a reaction flask, heat to 110° C., condense and reflux for 2 h, filter and concentrate the filtrate under reduced pressure, wash the product with water, add it to 80 mL of ethanol, add 0.22 g of Pd / C catalyst and 2 mL of hydrazine hydrate solution (volume fraction 80%), heat to 80° C., condense and reflux for 10 h, filter and purify by recrystallization to obtain 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine.

[0038] (2) Add 15 mL of N-methylpyrrolidone, 4.2 mL of pyridine, 5 mmol of 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine, and 10 mmol of triphenyl phosphite into a reaction kettle, introduce nitrogen, heat to 125° C., react for 4 hours, cool, add ethanol aqueous solution, filter, wash with ethanol, and dry to obtain hyperbranched triazine-based polyaromatic amide.

[0039] (3) 2000 g of SBS styrene-butadiene styrene copolymer, 600 g of nylon 6, 40 g of hyperbranched triazine-based polyaramid, 6 g of maleic anhydride grafted SBS, 12 g of antioxidant 1010, and 36 g of stearic acid were added to a twin-screw extruder for melt extrusion, mixed at 175° C. for 20 min, and then molded in a flat vulcanizer at 170° C. for 10 min at a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0040] Example 5

[0041] (1) Add 40 mL of toluene, 3 mmol of 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine, 10.8 mmol of 4-nitrobenzeneboric acid, 18 mmol of sodium hydroxide, and 0.078 mmol of di(triphenylphosphine)palladium dichloride into a reaction flask, heat to 110° C., condense and reflux for 2 h, filter and concentrate the filtrate under reduced pressure, wash with water, add the product to 80 mL of ethanol, add 0.21 g of Pd / C catalyst and 2.5 mL of hydrazine hydrate solution (volume fraction 80%), heat to 80° C., condense and reflux for 8 h, filter and purify by recrystallization to obtain 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine.

[0042] (2) Add 15 mL of N-methylpyrrolidone, 4.2 mL of pyridine, 5 mmol of 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine, and 9 mmol of triphenyl phosphite into a reaction kettle, introduce nitrogen, heat to 120° C., react for 6 hours, cool, add ethanol aqueous solution, filter, wash with ethanol, and dry to obtain hyperbranched triazine-based polyaromatic amide.

[0043] (3) 2000 g of SBS styrene-butadiene styrene copolymer, 800 g of nylon 6, 100 g of hyperbranched triazine polyaramid, 14 g of maleic anhydride grafted SBS, 16 g of antioxidant 1076, and 28 g of stearic acid were added to a twin-screw extruder for melt extrusion, and then molded in a flat vulcanizer at 170° C. for 10 min and a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0044] Example 6

[0045] (1) Add 40 mL of toluene, 3 mmol of 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine, 9.6 mmol of 4-nitrobenzeneboric acid, 15 mmol of sodium hydroxide, and 0.06 mmol of di(triphenylphosphine)palladium dichloride into a reaction flask, heat to 100° C., condense and reflux for 3 h, filter and concentrate the filtrate under reduced pressure, wash the product with water, add it to 100 mL of ethanol, add 0.18 g of Pd / C catalyst and 2.1 mL of hydrazine hydrate solution (volume fraction 80%), heat to 85° C., condense and reflux for 6 h, filter and purify by recrystallization to obtain 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine.

[0046] (2) Add 15 mL of N-methylpyrrolidone, 3 mL of pyridine, 5 mmol of 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine, and 9.6 mmol of triphenyl phosphite into a reaction kettle, introduce nitrogen, heat to 115° C., react for 6 hours, cool, add ethanol aqueous solution, filter, wash with ethanol, and dry to obtain hyperbranched triazine-based polyaromatic amide.

[0047] (3) 2000 g of SBS styrene-butadiene styrene copolymer, 1000 g of nylon 6, 150 g of hyperbranched triazine polyaramid, 23 g of maleic anhydride grafted SBS, 16 g of antioxidant 1076, and 31 g of stearic acid were added to a twin-screw extruder for melt extrusion, and then molded in a flat vulcanizer at 170° C. for 10 min and a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0048] Example 7

[0049] (1) 2000 g of SBS styrene-butadiene styrene copolymer, 1200 g of nylon 6, 200 g of hyperbranched triazine-based polyaramid, 32 g of maleic anhydride grafted SBS, 16 g of antioxidant 1010, and 36 g of stearic acid were added to a twin-screw extruder for melt extrusion, and then molded in a flat vulcanizer at 170° C. for 10 min and a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0050] Comparative Example 1

[0051] (1) 2000 g of SBS styrene-butadiene styrene copolymer, 600 g of nylon 6, 6 g of maleic anhydride grafted SBS, 12 g of antioxidant 1010, and 36 g of stearic acid were added to a twin-screw extruder for melt extrusion, mixed at 175° C. for 20 min, and then molded in a flat vulcanizer at 170° C. for 10 min at a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0052] Comparative Example 2

[0053] (1) 2000 g of SBS styrene-butadiene styrene copolymer, 600 g of nylon 6, 40 g of hyperbranched triazine-based polyaramid, 12 g of antioxidant 1010, and 36 g of stearic acid were added to a twin-screw extruder for melt extrusion, mixed at 175° C. for 20 min, and then molded in a flat vulcanizer at 170° C. for 10 min at a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0054] Comparative Example 3

[0055] (1) Add 15 mL of N-methylpyrrolidone, 4.2 mL of pyridine, 5 mmol of 5-aminoisophthalic acid, and 10 mmol of triphenyl phosphite into a reaction kettle, introduce nitrogen, heat to 125° C., react for 4 hours, cool, add ethanol aqueous solution, filter, wash with ethanol, and dry to obtain hyperbranched polyarylamide.

[0056] (2) 2000 g of SBS styrene-butadiene styrene copolymer, 600 g of nylon 6, 40 g of hyperbranched polyaramid, 6 g of maleic anhydride grafted SBS, 12 g of antioxidant 1010, and 36 g of stearic acid were added to a twin-screw extruder for melt extrusion, mixed at 175° C. for 20 min, and then molded in a flat vulcanizer at 170° C. for 10 min at a pressure of 10 MPa to obtain a highly wear-resistant TPR thermoplastic elastomer.

[0057] The highly wear-resistant TPR thermoplastic elastomer was made into a test specimen.

[0058] The wear resistance is tested according to GB / T 1689-2014. The TPR thermoplastic elastomer is heat treated at 150°C for 48 hours and then cooled before the wear resistance test.

[0059] The tensile properties are tested according to GB / T528-2009 method.

[0060] The hardness is tested according to GB / T 531.1-2008 method.

[0061] The test results are shown in Table 2-3.

[0062] Table 2: Wear loss of Akron before and after heat treatment

[0063]

[0064] Table 3: Tensile strength, elongation at break and hardness

[0065]

[0066]

[0067] After testing, compared with Comparative Example 1, the TPR thermoplastic elastomer material of Examples 1-4 is added with hyperbranched triazine-based polyaramid, which contains a polyamide molecular chain structure and has good compatibility with nylon 6. At the same time, it contains terminal amino groups, which can react with the anhydride groups of maleic anhydride grafted SBS, so that the maleic anhydride grafted SBS plays the role of a compatibilizer, improves the compatibility between the hyperbranched triazine-based polyaramid and the SBS styrene-butadiene styrene copolymer, so that the hyperbranched triazine-based polyaramid is uniformly dispersed in the thermoplastic elastomer matrix of the SBS styrene-butadiene styrene copolymer and nylon 6, which is beneficial to improve the tensile strength, elongation at break and Shore A hardness of the elastomer material. In addition, by adding hyperbranched triazine-based polyaromatic amide, the Akron wear of the elastomer material becomes smaller and the wear resistance becomes better. At the same time, the hyperbranched triazine-based polyaromatic amide contains a structurally stable phenyl-s-triazine structure, has strong heat resistance, and is not easy to be thermally decomposed, which is beneficial to improving the heat resistance of the elastomer material. After high-temperature heat treatment, the material still has a low Akron wear and maintains good wear resistance.

[0068] In Comparative Example 2, no maleic anhydride grafted SBS was added, and the compatibility between the hyperbranched triazine-based polyaramid and the SBS styrene-butadiene styrene copolymer was poor, resulting in poor dispersion of the hyperbranched triazine-based polyaramid in the elastomer material matrix, and the tensile strength, elongation at break, Shore A hardness and other mechanical properties of the material were lower than those of Examples 1-4.

[0069] Comparative Example 3: Hyperbranched polyaromatic amide is prepared using existing 5-aminoisophthalic acid and added to a thermoplastic elastomer matrix of SBS styrene-butadiene styrene copolymer and nylon 6. The tensile strength, elongation at break, Shore A hardness and other mechanical properties of the material are also significantly improved. The Akron abrasion loss is low and the wear resistance is good. However, it does not contain the heat-resistant phenyl-s-triazine structure, and the heat resistance of the material is poor. After heat treatment, the Akron abrasion loss of the material increases significantly and the wear resistance deteriorates.

Claims

1. A highly wear-resistant TPR thermoplastic elastomer, characterized in that: The highly wear-resistant TPR thermoplastic elastomer comprises: 15-25 parts by weight of SBS styrene-butadiene styrene copolymer, 10-20 parts by weight of filler oil, 15-30 parts by weight of mineral filler, 10-20 parts by weight of compatibilizer, 10-20 parts by weight of monomer resin, and 0.1-1 parts by weight of antioxidant.

2. The highly wear-resistant TPR thermoplastic elastomer according to claim 1, characterized in that: The filler oil is white oil, and the mineral filler is any one or a combination of barium sulfate, calcium carbonate and talcum powder.

3. The highly wear-resistant TPR thermoplastic elastomer according to claim 1, characterized in that: The compatibilizer is any one or a combination of maleic anhydride grafted SEBS and maleic anhydride grafted POE.

4. The highly wear-resistant TPR thermoplastic elastomer according to claim 1, characterized in that: The antioxidant is any one or a combination of antioxidant 1010, antioxidant 1076, and antioxidant 168.

5. The highly wear-resistant TPR thermoplastic elastomer according to claim 1, characterized in that: The monomer resin is EASTMAN monomer resin Kristalex5140.

6. A method for preparing a highly wear-resistant TPR thermoplastic elastomer according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: adding SBS styrene-butadiene styrene copolymer, filler oil, mineral filler, compatibilizer, monomer resin and antioxidant into a twin-screw extruder for melt extrusion, and then performing molding in a flat vulcanizer to obtain a highly wear-resistant TPR thermoplastic elastomer.

7. The highly wear-resistant TPR thermoplastic elastomer according to claim 1, characterized in that: The TPR thermoplastic elastomer also includes: 100 parts by weight of SBS styrene-butadiene styrene copolymer, 30-60 parts by weight of nylon 6, 2-10 parts by weight of hyperbranched triazine-based polyaromatic amide, 0.3-1.6 parts by weight of maleic anhydride grafted SBS, 0.6-0.8 parts by weight of antioxidant, 1.4-1.8 parts by weight of stearic acid, and 10-25 parts by weight of filler oil.

8. The method for preparing a highly wear-resistant TPR thermoplastic elastomer according to claim 7, characterized in that: The preparation method of the hyperbranched triazine-based polyaromatic amide is: (1) Add toluene, 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine, 4-nitrobenzeneboric acid, sodium hydroxide, and bis(triphenylphosphine)palladium dichloride to a reaction flask, heat to 100-110° C., condense and reflux for 2-3 hours, filter and concentrate the filtrate under reduced pressure, wash with water, add the product to ethanol, add Pd / C catalyst and hydrazine hydrate solution, heat to 80-85° C., condense and reflux for 5-10 hours, filter and purify by recrystallization to obtain 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine; (2) Add N-methylpyrrolidone, pyridine, 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine, and triphenyl phosphite into a reaction kettle, introduce nitrogen, heat to 115-125° C., react for 3-6 hours, cool, add ethanol aqueous solution, filter, wash with ethanol, and dry to obtain hyperbranched triazine-based polyaromatic amide.

9. The method for preparing a highly wear-resistant TPR thermoplastic elastomer according to claim 8, characterized in that: The molar ratio of 2-(4-carboxyphenoxy)-4,6-dichloro-1,3,5-triazine, 4-nitrophenylboric acid, sodium hydroxide and bis(triphenylphosphine)palladium dichloride in (1) is 1:(2.8-3.6):(5-7):(0.02-0.026).

10. The method for preparing a highly wear-resistant TPR thermoplastic elastomer according to claim 8, characterized in that: The molar ratio of 2-(4-carboxyphenoxy)-4,6-di(4-aminophenyl)-1,3,5-triazine to triphenyl phosphite in (2) is 1:(1.8-2).

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