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Polyurethane sealing material and preparation method thereof

A sealing material, polyurethane technology, applied in the field of polyurethane, can solve problems such as poor adhesion, complicated operation process, drop, etc., and achieve good adhesion performance, long gel time, and good mechanical properties

Active Publication Date: 2015-04-22
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because hydroxyl-terminated polybutadiene does not contain ether bonds and ester bonds, the polyurethane sealing material prepared from it has more excellent hydrolysis resistance and electrical properties, good impact resistance, excellent low temperature performance and thermal shock performance, It is especially suitable for harsh environments such as underwater humidity, salt spray resistance, and high insulation; but at room temperature, the polyurethane material prepared by hydroxyl-terminated polybutylene diol has poor adhesion to metal substrates, especially stainless steel, and the sealant and adhesive The interface bonding is prone to cracks and peeling off
The use of high temperature curing can improve the bonding strength, but the operation process is complicated, which not only requires huge heating and curing equipment, is not suitable for large structural devices or cable potting, but also easily causes damage to electronic and electrical components and performance decline.

Method used

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  • Polyurethane sealing material and preparation method thereof
  • Polyurethane sealing material and preparation method thereof
  • Polyurethane sealing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of component A: 100 parts of carbodiimide-modified MDI, 10 parts of dimethoxyethyl phthalate, mixed at room temperature for 1 hour, and vacuum defoaming to obtain component A.

[0024] Preparation of component B: 100 parts of epoxidized hydroxyl-terminated polybutadiene (hydroxyl value 0.8 mmol / g, epoxy value 1.5 mmol / g), 35 parts of dimethoxyethyl phthalate, chain extender 5.5 parts (N, N'-bis(2-hydroxypropyl) aniline / 1,4-butanediol=1 / 1), after mixing and dehydrating, add 3 parts of epoxy silane, 0.5 part of stannous octoate and 1.0 parts of polysiloxane, after mixing evenly, the B component is obtained.

[0025] At room temperature, adjust the ratio of components A and B to B / A=100:20, mix the two components thoroughly, defoam, inject into a mold at room temperature, gel in 40 minutes, and test performance after 7 days at room temperature.

Embodiment 2

[0027] Preparation of component A: 100 parts of carbamate-modified MDI, 15 parts of dioctyl phthalate, mixed at room temperature for 1 hour, and vacuum defoaming to obtain component A.

[0028] Preparation of component B: 100 parts of epoxidized hydroxyl-terminated polybutadiene (hydroxyl value 1.2mmol / g, epoxy value 1.9mmol / g), 25 parts of dioctyl phthalate, 7 parts of chain extender ( N,N'-bis(2-hydroxypropyl)aniline / 1,4-butanediol=3 / 1), after mixing and dehydrating, add 6 parts of epoxy silane, 0.3 parts of stannous octoate and modified polymer 1.0 parts of siloxane, after mixing evenly, the B component is obtained.

[0029] At room temperature, adjust the dosage ratio of components A and B to B / A=100:24.8, mix the two components thoroughly, defoam, inject into a mold at room temperature, gel for 30 minutes, and test performance after 7 days at room temperature.

Embodiment 3

[0031] Preparation of component A: 100 parts of carbodiimide-modified MDI, 20 parts of dimethoxyethyl phthalate, mixed at room temperature for 1 hour, and vacuum defoamed.

[0032] Preparation of component B: 100 parts of epoxidized hydroxyl-terminated polybutadiene (hydroxyl value 2.0 mmol / g, epoxy value 3.5 mmol / g), 20 parts of dimethoxyethyl phthalate, chain extender 7.9 parts (N,N'-bis(2-hydroxypropyl)aniline / 1,4-butanediol=1 / 1), after mixing and dehydrating, add 4.5 parts of aminopropylsilane, 0.2 parts of stannous octoate and 1.5 parts of polysiloxane, after mixing evenly, the B component is obtained.

[0033] At room temperature, the mass ratio of B / A is 100:29, fully mixed, defoamed, injected into a mold at room temperature, gelled in 25 minutes, and left at room temperature for 7 days to measure performance.

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Abstract

The invention discloses a polyurethane sealing material comprising the following components in parts by mass: 100 parts of isocyanate and 10-20 parts of a plasticizer in a component A, and 100 parts of epoxy hydroxyl-terminated polybutadiene, 5.5-7.9 parts of a chain extender, 20-35 parts f a plasticizer, 3-6 parts of a coupling agent, 0.2-0.5 part of a catalyst and 1.0-1.5 parts of a defoaming agent in a component B, wherein the ratio of B to A is 100:(20-29), the hydroxyl value of the epoxy hydroxyl-terminated polybutadiene is 0.8-2.0mmol / g, and the epoxy value is 1.5-3.5mmol / g. The material disclosed by the invention can be solidified at room temperature, is long in gelation time and good in flowability, has high bonding strength with metals particularly good bonding property with base materials of stainless steel and the like, and is especially suitable for encapsulation of large-scale internal structure complex components and cables. The polyurethane sealing material disclosed by the invention is prepared by adopting a one-step process, and the obtained material has hardness of 70-85A and is good in mechanical property.

Description

technical field [0001] The invention belongs to the field of polyurethane, in particular to a polyurethane sealing material with good bonding performance. Background technique [0002] Polyurethane sealing materials are widely used in various fields such as telecommunication cables, electronics, aerospace, petroleum, automobiles, etc. due to their excellent water resistance, oil resistance, low temperature performance, shock absorption, electrical properties and mold resistance, but in some special and high In the field of insulation sealing and waterproof materials that are required, the requirements for polyurethane sealing materials are more stringent. [0003] Because hydroxyl-terminated polybutadiene does not contain ether bonds and ester bonds, the polyurethane sealing material prepared from it has more excellent hydrolysis resistance and electrical properties, good impact resistance, excellent low temperature performance and thermal shock performance, It is especiall...

Claims

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Application Information

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IPC IPC(8): C08G18/65C08G18/62C08G18/32C09J175/04C09K3/10
CPCC08G18/3206C08G18/329C08G18/6535C08G18/69C08G2190/00C09J175/14
Inventor 郑直石雅琳苏丽丽韦永继
Owner LIMING RES INST OF CHEM IND
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