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Preparation method of heat-resistant polyurethane elastomer

A technology of polyurethane elastomers and polyurethane prepolymers, which is applied in the field of preparation of heat-resistant polyurethane elastomers, can solve the problems of poor dispersion of inorganic fillers and weakened mechanical properties of polyurethane elastomers, and achieve enhanced heat resistance, The effect of short reaction time and easy availability of raw materials

Active Publication Date: 2020-05-22
JIANGSU WELLCARE HOUSEHOLD ARTICLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low price of inorganic fillers, they are usually added during the preparation of polyurethane elastomers to improve heat resistance. However, there are two common adding methods at present. One is to directly mix and react polyurethane elastomers, inorganic fillers and other additives (such as patented Application No. 201810490242.1); the other is to mix polyurethane prepolymers with other additives such as inorganic fillers (such as patent application No. 201410230109.4); both methods have a disadvantage: inorganic fillers cannot be well dispersed in polyurethane materials In the middle, the mechanical properties of polyurethane elastomers are weakened

Method used

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  • Preparation method of heat-resistant polyurethane elastomer
  • Preparation method of heat-resistant polyurethane elastomer
  • Preparation method of heat-resistant polyurethane elastomer

Examples

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Embodiment 1

[0035] A preparation method of heat-resistant polyurethane elastomer, comprising the following steps:

[0036] 1) Mix 500g of polyoxypropylene triol with a molecular weight of 5000g / moL and 500g of polyoxypropylene diol with a molecular weight of 2500g / moL and vacuum dehydrate at 90°C to form component A, in which polyoxypropylene triol and polyoxypropylene diol The mass ratio of TDI and A component is kept at 80°C for 2 hours to obtain a polyurethane prepolymer, and the molar ratio of A component to TDI is 0.8:1;

[0037] 2) 300g of polyoxypropylene triol with a molecular weight of 5000g / moL is mixed with 45g of diatomite powder, and dry-milled with a ball mill to obtain a polyoxypropylene triol / diatomite compound;

[0038] 3) 50g of silicon carbide powder is dried after coarsening and activation treatment, and then subjected to electroplating treatment, wherein the electroplating solution is a mixed solution of nickel chloride and chromium chloride, and the mass-volume ratio...

Embodiment 2

[0041]A preparation method of heat-resistant polyurethane elastomer, comprising the following steps:

[0042] 1) Mix 500g of polyoxypropylene triol with a molecular weight of 5000g / moL and 500g of polyoxypropylene diol with a molecular weight of 2500g / moL and vacuum dehydrate at 100°C to form component A, in which polyoxypropylene triol and polyoxypropylene diol The mass ratio of 1.5:1; IPDI and A component were incubated at a temperature of 90°C for 1 hour to obtain a polyurethane prepolymer, and the molar ratio of A component to IPDI was 0.5:1;

[0043] 2) Mix 300 g of polyoxypropylene triol with a molecular weight of 5000 g / moL and 30 g of diatomite powder, and dry ball mill with a ball mill to obtain a polyoxypropylene triol / diatomite compound;

[0044] 3) 50g of silicon carbide powder is dried after coarsening and activation treatment, and then subjected to electroplating treatment, wherein the electroplating solution is a mixed solution of nickel chloride and chromium ch...

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Abstract

The invention discloses a preparation method of a heat-resistant polyurethane elastomer. The method comprises the following steps: dehydrating polyoxypropylene triol and polypropylene oxide glycol toform a component A; reacting diisocyanate with the component A to obtain a polyurethane prepolymer; carrying out ball milling on polyoxypropylene triol and diatomite powder to obtain a compound of thepolyoxypropylene triol and the diatomite; attaching a layer of nickel and chromium to the surface of silicon carbide powder through electroplating; and mixing the polyurethane prepolymer, the modified silicon carbide and the polyoxypropylene triol / diatomite compound, and curing to obtain the heat-resistant polyurethane elastomer. According to the preparation method, firstly, the polyoxypropylenetriol and the diatomite are subjected to ball milling and mixing to obtain the compound, and the polyoxypropylene triol can expand the distance between diatomite lamellas, so that a polyurethane molecular chain is well inserted into the lamellas, and the mechanical property and heat resistance of the polyurethane elastomer are improved; a layer of nickel and a layer of chromium are attached to thesurface of the silicon carbide through an electroplating method, the silicon carbide is well dispersed in polyurethane, and the heat resistance of the polyurethane elastomer can be enhanced by addingthe nickel and the chromium.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a heat-resistant polyurethane elastomer. Background technique [0002] Polyurethane (polyurethane) refers to a polymer containing repeated urethane bond structural units (-NH-COO-) on the main chain of the polymer. Urethane is generally composed of dibasic or polyisocyanate It is obtained by reacting with dibasic or polyhydric alcohols. The main chain of thermoplastic polyurethane elastomer (TPU) is a block polymer composed of soft soft segment and rigid hard segment alternately. The soft segment is composed of polyol, and the hard segment is composed of isocyanate and chain extender. The soft segment is in rubber state. Provide elasticity and toughness, the hard segment is glassy or semi-crystalline, providing hardness, modulus and high temperature performance. A large number of hydrogen bonds can be formed between the soft and har...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08K7/26C08K9/02C08K3/34C08G18/76C08G18/75C08G18/48
CPCC08K7/26C08K9/02C08K3/34C08G18/7614C08G18/755C08G18/4812C08G18/4825C08G18/4829C08L75/08
Inventor 吴超群
Owner JIANGSU WELLCARE HOUSEHOLD ARTICLES
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