Solvent-resistant epoxy modified polyurethane sealant and preparation method thereof

A polyurethane sealant and epoxy modification technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of poor solvent resistance of sealants, failure of bonding and sealing, corrosion of sealants, etc. , to achieve good bonding and sealing effects, improve solvent resistance, and improve softness and hardness

Active Publication Date: 2019-08-27
广东盛业化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the long-term use of traditional polyurethane sealants, there will be problems such as sealant aging and bonding and sealing failure, which will lead to air leakage of the gas meter and pose a major safety hazard
The reason for this problem is, on the one hand, the normal aging of the natural environment, and on the other hand, a very important reason is the poor solvent resistance of the sealant.
As we all know, the main components of natural gas, coal gas, liquefied petroleum gas and other gases are hydrocarbons. This liquefied gas will cause a certain degree of corrosion to the gas meter. After long-term contact, it will corrode the sealant and cause the gas meter to leak.

Method used

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  • Solvent-resistant epoxy modified polyurethane sealant and preparation method thereof
  • Solvent-resistant epoxy modified polyurethane sealant and preparation method thereof
  • Solvent-resistant epoxy modified polyurethane sealant and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046] A preparation method of a solvent-resistant epoxy-modified polyurethane sealant, comprising the steps of:

[0047] Step (1), preparation of epoxy-modified polyurethane prepolymer A: Add 360g of epoxy-modified polyether triol and 480g of polyether triol (relative molecular weight 5000) successively in a dry 2L four-necked bottle, and heat up Vacuum dehydration at 100°C for 2 hours, after detecting that the moisture content of the liquid material is ≤100ppm, cool down to 80°C, add 280g of diphenylmethyl diisocyanate, and keep the reaction for 5 hours under the protection of nitrogen. When the NCO value does not change after the reaction, cool down to room temperature , discharging to obtain the epoxy-modified polyurethane prepolymer A, which is placed in a dry nitrogen airtight container for subsequent use.

[0048] Step (2), preparation of low-viscosity polyurethane prepolymer B: put 800g of polyether diol in a one-mouth bottle, heat up to 100°C, vacuumize and dehydrate,...

Embodiment 2

[0057] A preparation method of a solvent-resistant epoxy-modified polyurethane sealant, comprising the steps of:

[0058] Step (1), preparation of epoxy-modified polyurethane prepolymer A: Add 522g of epoxy-modified polyether triol and 174g of polyether triol (relative molecular weight 5000) successively in a dry 2L four-necked bottle, and heat up Vacuum dehydration at 100°C for 2 hours, after detecting that the moisture content of the liquid material is ≤100ppm, cool down to 85°C, add 464g of toluene diisocyanate, keep it under nitrogen protection for 5 hours, and wait until the NCO value does not change, cool down to room temperature, and discharge , to prepare epoxy-modified polyurethane prepolymer A, and place it in a dry nitrogen-airtight container for subsequent use.

[0059] Step (2), preparation of low-viscosity polyurethane prepolymer B: put 800g of polyether diol in a single-mouth bottle, heat up to 105°C, vacuumize and dehydrate, and when the moisture content is les...

Embodiment 3

[0068] A preparation method of a solvent-resistant epoxy-modified polyurethane sealant, comprising the steps of:

[0069] Step (1), preparation of epoxy-modified polyurethane prepolymer A: Add 232g of epoxy-modified polyether triol and 464g of polyether triol (relative molecular weight 5000) successively in a dry 2L four-necked bottle, and heat up Vacuum dehydration at 110°C for 2 hours. After detecting that the moisture content of the liquid material is ≤100ppm, cool down to 90°C, add 464g of p-phenylene diisocyanate, and keep it under nitrogen protection for 5 hours. When the NCO value does not change after the reaction, cool down to room temperature. Material, prepared epoxy-modified polyurethane prepolymer A, placed in a dry nitrogen airtight container for subsequent use.

[0070] Step (2), preparation of low-viscosity polyurethane prepolymer B: put 400g of polyether diol in a single-mouth bottle, heat up to 110°C, vacuumize and dehydrate, and when the moisture content is ...

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Abstract

The invention relates to the technical field of sealants, in particular to a solvent-resistant epoxy modified polyurethane sealant and a preparation method thereof. The sealant is prepared from, by weight, 20-40% of an epoxy modified polyurethane prepolymer A, 10-30% of a low-viscosity polyurethane prepolymer B, 29.4-59.4% of an inorganic filler, 0.01-30% of a thixotropic agent, 0.01-2% of a curing promoter, 0.01-2% of a water removal stabilizer and 0.01-2% of an adhesion promoter. The epoxy modified polyurethane sealant has excellent chemical corrosion resistance and mechanical properties, through a chemical corrosion test in the industry standard of a membrane-type gas meter, after liquid immersion, the mechanical properties, mass change rate and volume change rate of the sealant can allbe kept at a very small change rate, the adhesive sealing effect is good, and the sealant can keep the good adhesive sealing function during long-term use in the gas meter.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a solvent-resistant epoxy-modified polyurethane sealant and a preparation method thereof. Background technique [0002] Membrane gas meter is a kind of instrument product used to measure gas in industrial production and residential life. In recent years, with the improvement of people's living standards, the demand for gas and gas meters is also rising. Gas is flammable and easy to Due to the property of explosion, the safety of transportation and use is very important. It is common to see major fire and explosion accidents caused by gas leakage reported by major news media. We are always alert to the importance of the airtightness of gas meters. [0003] At present, there are two main types of sealants used for bonding and sealing gas meters. One is the traditional vulcanized rubber sealing gasket, which has poor adhesion to the instrument substrate and only plays a simple seal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J127/06C09J175/02C09J11/04
CPCC08K2003/265C08K2201/011C09J11/04C09J175/08C08L27/06C08K3/26C08K3/36C08K3/04C08L75/02C08K3/346
Inventor 郭盟李桂妃张志文边峰招兆林任如飞谢志明
Owner 广东盛业化学科技有限公司
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