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Preparation method of polyurethane composite material with heat-resistant property

A composite material and polyurethane technology, which is applied in the field of polyurethane composite material preparation, can solve the problems of limiting the application range of polyurethane materials, easy softening, decomposition, and low aging resistance, so as to improve heat resistance and physical and mechanical properties. Rigidity, increased interaction effect

Inactive Publication Date: 2018-11-23
CHUZHOU GLOBAL POLYURETHANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the polyurethane molecule contains allophanate, biuret, ether, ester and other groups, its heat resistance is not good, it is easy to soften and decompose at high temperature, and its mechanical properties drop sharply
Ordinary polyurethane materials can only be used below 80°C for a long time, and the short-term use temperature does not exceed 120°C, and its aging resistance is not high, which limits the application range of polyurethane materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of preparation method of the heat-resistant polyurethane composite material that the present invention proposes, comprises the following steps:

[0019] S1. Mix 40 parts of epoxidized hydroxyl-terminated polybutadiene, 60 parts of polytetrahydrofuran ether glycol, 35 parts of 4,4'-diphenylmethane diisocyanate, and 0.02 parts of dibutyltin dilaurate, and heat up to 75°C , stirred and reacted for 1.5h, then added 9 parts of 3,5-dimethylthiotoluenediamine and 8 parts of dibromoneopentyl glycol, stirred and reacted for 2 hours, vacuumed for defoaming, dried and matured to obtain a polyurethane prepolymer; Wherein, the hydroxyl value of epoxidized hydroxyl-terminated polybutadiene is 0.8-1.1 mmol / g, and the epoxy value is 1.6-2.0 mmol / g;

[0020] S2, 100 parts of polyurethane prepolymer, 5 parts of phenolic resin, 3 parts of styrene, 0.5 part of lutein, 7 parts of white carbon black, 3 parts of nano silicon dioxide, 15 parts of kaolin, and 0.2 part of plasticizer are ...

Embodiment 2

[0023] A kind of preparation method of the heat-resistant polyurethane composite material that the present invention proposes, comprises the following steps:

[0024] S1. Mix 50 parts of epoxidized hydroxyl-terminated polybutadiene, 50 parts of polytetrahydrofuran ether glycol, 44 parts of 4,4'-diphenylmethane diisocyanate, and 0.05 parts of dibutyltin dilaurate, and heat up to 85 ℃, stirred and reacted for 2 hours, then added 14 parts of 3,5-dimethylthiotoluenediamine and 5 parts of dibromoneopentyl glycol, stirred and reacted for 3 hours, vacuumed for defoaming, dried and matured to obtain a polyurethane prepolymer; Wherein, the hydroxyl value of epoxidized hydroxyl-terminated polybutadiene is 0.8-1.1 mmol / g, and the epoxy value is 1.6-2.0 mmol / g;

[0025] S2, 100 parts of polyurethane prepolymer, 12 parts of phenolic resin, 1 part of styrene, 2 parts of lutein, 3 parts of white carbon black, 7 parts of nano silicon dioxide, 7 parts of kaolin, and 1 part of plasticizer were ...

Embodiment 3

[0028] A kind of preparation method of the heat-resistant polyurethane composite material that the present invention proposes, comprises the following steps:

[0029] S1. Mix 44 parts of epoxidized hydroxyl-terminated polybutadiene, 56 parts of polytetrahydrofuran ether glycol, 39 parts of 4,4'-diphenylmethane diisocyanate, and 0.03 parts of dibutyltin dilaurate, and heat up to 80 ℃, stirred and reacted for 1.5h, then added 10 parts of 3,5-dimethylthiotoluenediamine and 7 parts of dibromoneopentyl glycol, stirred and reacted for 2.5 hours, vacuumed for defoaming, dried and matured to obtain polyurethane prepolymer body; wherein, the hydroxyl value of epoxidized hydroxyl-terminated polybutadiene is 0.8-1.1mmol / g, and the epoxy value is 1.6-2.0mmol / g;

[0030] S2, 100 parts of polyurethane prepolymer, 8 parts of phenolic resin, 2 parts of styrene, 1 part of lutein, 6 parts of white carbon black, 4 parts of nano-silica, 11 parts of kaolin, and 0.4 parts of plasticizer were added ...

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Abstract

The invention discloses a preparation method of a polyurethane composite material with heat-resistant property, and relates to the technical field of preparation of polyurethane. The preparation method comprises the following steps of mixing epoxidated hydroxyl terminated polybutadiene, polytetrahydrofuran ether glycol, 4,4'-diphenylmethane diisocyanate, and dibutyltin dilaurate, heating to react,adding 3,5-dimethyl sulphide toluene diamine and dibromo neopentadiol, stirring to react, defoaming, drying and aging, so as to obtain a polyurethane prepolymer; adding the polyurethane prepolymer, phenolic resin, styrene, xanthophyll, white carbon black, nanometer silicon dioxide, kaolin and a plasticizer into a double-screw mixer, mixing, adding aluminum hydroxide, zinc borate, zinc stearate, avulcanizing agent and a vulcanizing accelerator, mixing, and discharging, so as to obtain the mixed material; molding and forming the mixed material, and radiating by 60Co gamma rays, so as to obtainthe polyurethane composite material. The polyurethane composite material has the advantages that the heat stability and the mechanical property are good, and the aging-resistant property is good.

Description

technical field [0001] The invention relates to the technical field of polyurethane preparation, in particular to a method for preparing a heat-resistant polyurethane composite material. Background technique [0002] Polyurethane is usually made from polyether / polyester polyol, isocyanate, chain extender, crosslinking agent and a small amount of additives. Because the polyurethane molecule contains allophanate, biuret, ether, ester and other groups, its heat resistance is not good, it is easy to soften and decompose at high temperature, and its mechanical properties drop sharply. Ordinary polyurethane materials can only be used below 80°C for a long time, and the short-term use temperature does not exceed 120°C, and their aging resistance is not high, which limits the application range of polyurethane materials. Contents of the invention [0003] Based on the technical problems in the background technology, the present invention proposes a method for preparing a heat-resi...

Claims

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Application Information

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IPC IPC(8): C08L75/14C08L61/06C08L25/06C08K13/02C08K3/36C08K3/34C08K5/098C08G18/69C08G18/66C08G18/48C08G18/32
CPCC08G18/381C08G18/3868C08G18/4854C08G18/6685C08G18/698C08L75/14C08L2201/08C08L2205/03C08L2312/00C08L61/06C08L25/06C08K13/02C08K3/36C08K3/346C08K5/098
Inventor 龚文祥
Owner CHUZHOU GLOBAL POLYURETHANE TECH CO LTD
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