High-hardness high-rebound polyurethane elastomer material and application thereof

A polyurethane elastomer, high resilience technology, applied in the field of high hardness and high resilience polyurethane elastomer materials, can solve the problems affecting the service life of wheels, low tensile strength and tear strength, large rolling resistance and endogenous heat, etc. , to achieve the effect of excellent mechanical properties and wear resistance

Inactive Publication Date: 2010-01-27
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The hardness of the high-resilience polyurethane elastomer synthesized in the above data does not exceed Shore 85A. The contact surface between the wheel and the ground is large when rolling, and the rolling resistance and internal heat generated are large. If it is used as a high-speed wheel, the life of the wheel will be longer. Short, in addition CN200710113884.1 and JP8231669 reported polyurethane elastomer tensile strength and tear strength are low, will also affect the service life of the wheel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Isocyanate component: add 500g of MDI to the reactor and preheat to 70°C, add 250g of PTMG650 and 250g of PTMG3000, react at 80°C for 3h under the protection of nitrogen to complete the reaction. A prepolymer with an isocyanate content of 12.9% was thus obtained.

[0021] Polyol component: Add 671g of PTMG2000, 100g of 1,4-butanediol, 1.5g of bismuth isooctanoate catalyst and 3g of antioxidant 1010 into the reactor, at 100~120℃, -0.095MPa~ Dehydration for 3 hours under the condition of -0.098MPa to obtain polyol components.

[0022] Elastomer synthesis: Preheat the isocyanate component and the polyol component to 40°C and mix them in a weight ratio of 100:80, pour them into a mold at 40°C and vulcanize for 30 minutes to release the mold. The properties of the obtained materials are listed in Table 1.

Embodiment 2

[0024] Isocyanate component: Add 323g of MDI and 125g of carbodiimide-modified liquefied MDI into the reactor, preheat to 70°C, add 200g of PTMG650 and 300g of PTMG2000, and react at 80°C for 3h under nitrogen protection to complete the reaction. A prepolymer with an isocyanate content of 11.20% was thus obtained.

[0025] Polyol component: Add 511g of PTMG2000, 98g of 1,4-butanediol, 1.2g of DBU catalyst and 3.0g of antioxidant BHT into the reactor, at 100~120℃, -0.095MPa~- Dehydration for 3 hours under the condition of 0.098MPa to obtain polyol components.

[0026] Elastomer synthesis: Preheat the isocyanate component and the polyol component to 40°C and mix them in a weight ratio of 100:60, pour them into a mold at 50°C and vulcanize for 30 minutes to release the mold. The properties of the obtained materials are listed in Table 1.

Embodiment 3

[0028] Isocyanate component: Add 410g of MDI into the reactor and preheat to 70°C, add 177g of PTMG650 and 413g of PTMG3000, react at 80°C for 3h under the protection of nitrogen to complete the reaction. A prepolymer with an isocyanate content of 10.31% was thus obtained.

[0029] Polyol component: Add 580g of PTMG2000, 85g of 1,4-butanediol, and 2.1g of lead catalyst of isooctanoate and 2.6g of 2-(2'-hydroxyl-3',5'- Di-tert-amylphenyl) benzotriazole is dehydrated at 100-120°C and -0.095MPa--0.098MPa for 3 hours to obtain polyol components.

[0030] Elastomer synthesis: Preheat the isocyanate component and the polyol component to 40°C and mix them in a weight ratio of 100:65, pour them into a mold at 60°C and vulcanize for 30 minutes to release the mold. The properties of the obtained materials are listed in Table 1.

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Abstract

The invention discloses a high-hardness high-rebound polyurethane elastomer material and introduces an application thereof. The material is obtained by mixing an isocyanate component and a polyhydric alcohol component at the temperature of 25-40 DEG C according to the weight ratio of 100:(50-100), pouring into a mould of 40-60 DEG C and vulcanizing for 30-60min. The hardness is 86-93A, the rebound rate is greater than 70%, the abrasion is smaller than 20mg, the tensile strength is greater than 25MPa, and the tearing strength is greater than 100kN/m. The isocyanate component is a performed polymer with the content of 6-18% of isocyanic acid radicals, and the performed polymer is generated in such a way that 20-60% of PTMG with the molecular weight smaller than or equal to 1,000 and 40-80% of doped PTMG with the molecular weight greater than 1,000 react with isocyanate or a derivative thereof; the polyhydric alcohol component comprises 69.2-89.4% of PTMG with the average molecular weight greater than 1000, 10-30% of fatty group dihydric alcohol, 0.2-0.3% of catalyst and 0.4-0.5% of antiaging agent. The polyurethane elastomer material can be used for preparing butterfly boards, active boards, pulleys used for rapid slide, pulleys of ice skates, pulleys of sliding boards and various castors.

Description

technical field [0001] The invention relates to a polyurethane elastomer preparation technology, in particular to a polyurethane elastomer material with high hardness and high resilience. Background technique [0002] Compared with other elastic materials, polyurethane materials have a wider range of hardness, and have better comprehensive properties in terms of wear resistance, elasticity and mechanical strength. Therefore, polyurethane is mostly used in elastic materials in skate wheels, skateboard wheels, and industrial and medical casters. Material. From the use state of the pulley, it is mainly divided into high-speed wheels and medium-low speed wheels. On the one hand, the high-speed wheels require the wheels to have higher hardness (hardness greater than Shore 85A), so that the rolling resistance is small, and the internal heat is small when rolling at high speed. On the one hand, the elastic material is required to have better resilience (rebound rate greater than 7...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/48
Inventor 石雅琳韦永继姚庆伦王振张永王焱潘洪波
Owner LIMING RES INST OF CHEM IND
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