Preparation method of heat-resisting modified polyurethane composite

A composite material and heat-resistant modification technology, which is applied in the field of polyurethane, can solve the problems of limiting the application of polyurethane materials, poor heat resistance, and easy yellowing, etc., and achieve excellent mechanical properties, increase hardness, and increase molecular weight.

Inactive Publication Date: 2016-08-24
CHUZHOU GLOBAL POLYURETHANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat resistance of ordinary polyurethane materials is not very good, and it is prone to yellowing and hardening during use, which greatly limits the practical application of polyurethane materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of heat-resistant modified polyurethane composite material that the present invention proposes, comprises the following steps:

[0022] S1. Add hexafluorobisphenol A and 3-aminopropylmethyldimethoxysilane into the reaction vessel at a molar ratio of 1:3, react at 125°C for 3.5 hours, and distill under reduced pressure after the reaction , cooling to obtain a silicon-containing chain extender;

[0023] S2. Mix 30 parts of polycarbonate diol, 35 parts of hydroxyl-terminated liquid silicone rubber with 5 parts of nano-calcium carbonate, 12 parts of montmorillonite and 5 parts of epoxy resin in parts by weight, and stir at a speed of 3500r / min 20min, under the protection of nitrogen, add 50 parts of 1,4-cyclohexane diisocyanate, 0.01 part of dibutyltin dioctoate and 50 parts of methyl ethyl ketone, heat up to 60°C and stir for 50min, then cool down to 50°C to obtain polyurethane prepolymerization body;

[0024] S3. Mix 50 parts of polyurethane...

Embodiment 2

[0026] A kind of preparation method of heat-resistant modified polyurethane composite material that the present invention proposes, comprises the following steps:

[0027] S1. Add hexafluorobisphenol A and 3-aminopropylmethyldimethoxysilane into the reaction vessel at a molar ratio of 1:2, react at 135°C for 2.5 hours, and distill under reduced pressure after the reaction , cooling to obtain a silicon-containing chain extender;

[0028] S2. Mix 50 parts of polycarbonate diol, 20 parts of hydroxyl-terminated liquid silicone rubber with 12 parts of nano-calcium carbonate, 3 parts of montmorillonite and 20 parts of epoxy resin in parts by weight. Stir for 50 minutes, add 30 parts of 1,4-cyclohexane diisocyanate, 0.12 parts of dibutyltin dioctoate and 30 parts of methyl ethyl ketone under the protection of nitrogen, heat up to 70°C and stir for 35 minutes, then cool down to 55°C to obtain polyurethane pre- Polymer;

[0029] S3, by weight, mix 30 parts of polyurethane prepolymer ...

Embodiment 3

[0031] A kind of preparation method of heat-resistant modified polyurethane composite material that the present invention proposes, comprises the following steps:

[0032] S1. Add hexafluorobisphenol A and 3-aminopropylmethyldimethoxysilane into the reaction vessel at a molar ratio of 1:2.3, react at 132°C for 2.9 hours, and distill under reduced pressure after the reaction , cooling to obtain a silicon-containing chain extender;

[0033] S2, mix 35 parts of polycarbonate diols, 32 parts of hydroxyl-terminated liquid silicone rubber with 7 parts of nano-calcium carbonate, 11 parts of montmorillonite and 7 parts of epoxy resin in parts by weight, at a speed of 3200r / min Stir for 32 minutes, add 47 parts of 1,4-cyclohexane diisocyanate, 0.05 parts of dibutyltin dioctoate and 45 parts of methyl ethyl ketone under the protection of nitrogen, heat up to 63°C and stir for 46 minutes, then cool down to 52°C to obtain polyurethane pre- Polymer; Wherein, the epoxy value of described e...

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Abstract

The invention discloses a preparation method of heat-resisting modified polyurethane composite, comprising: adding hexafluobisphenol A and 3-aminopropyl-methyldimethoxysilane into a reaction container, and reacting to obtain silicon-bearing chain extender; mixing well polycarbonate diols, hydroxyl-terminated liquid silicon rubber, nano calcium carbonate, montmorillonite and epoxy resin, adding 1,4-cyclohexane diisocyanate, dibutyltin dioctanoate and butanone, and stirring and reacting to obtain polyurethane prepolymer; mixing well the polyurethane prepolymer with 1,4-bis(2-hydroxyethoxy)benzene, 4,4'-diaminodiphenyl and the silicon-bearing chain extender, and stirring and reacting and then curing to obtain the heat-resisting modified polyurethane composite. The preparation method of the heat-resisting modified polyurethane composite provided herein has a simple process and mild conditions, and the obtained composite has high strength, good heat resistance and excellent ageing resistance and can meet the requirement of use in various fields.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a preparation method of a heat-resistant modified polyurethane composite material. Background technique [0002] Polyurethane is a general term for macromolecular compounds containing repeated carbamate groups on the main chain. It has excellent properties such as wear resistance, oil resistance, tear resistance, and chemical corrosion resistance. It has a wide range of uses and can replace rubber, plastic, and nylon. etc., used in airports, hotels, building materials, automobile factories, coal mines, cement factories, high-end apartments, villas, landscaping, colored stone art, parks and other fields. However, the heat resistance of ordinary polyurethane materials is not very good, and it is prone to yellowing and hardening during use, which greatly limits the practical application of polyurethane materials. Contents of the invention [0003] Based on the technical prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/44C08G18/61C08G18/58C08G18/32C08G18/38C08G18/12C08K3/26C08K3/34
CPCC08G18/12C08G18/4045C08G18/44C08G18/58C08G18/61C08G18/751C08K3/26C08K3/346C08K2003/265C08K2201/003C08K2201/011
Inventor 龚文祥
Owner CHUZHOU GLOBAL POLYURETHANE TECH CO LTD
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