A kind of synthetic method and application of organosilicon modified polyurethane prepolymer

A technology of polyurethane prepolymer and synthesis method, which is applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., can solve the problems of poor salt spray corrosion resistance and achieve good salt spray corrosion resistance Effect

Active Publication Date: 2016-01-20
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of relatively poor salt spray corrosion resistance of polyurethane adhesives in the prior art, the present invention uses polyether diols (molecular weight is 4000, commercially available grades are D4000) and active end groups (-OH) Alkyl hydroxypolysiloxane (BD-3253, molecular weight 3000) undergoes addition polymerization reaction with diphenylmethane diisocyanate (MDI100) to prepare silicone block polyurethane prepolymer, so as to meet the technical requirements of marine adhesives

Method used

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  • A kind of synthetic method and application of organosilicon modified polyurethane prepolymer
  • A kind of synthetic method and application of organosilicon modified polyurethane prepolymer

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Effect test

Embodiment 1

[0014] Weigh 1800 grams of polyether diol D4000 into a three-necked flask, vacuum dehydrate at 120±5°C for 2~3 hours, then cool down to below 60°C, add 400 grams of diphenylmethane diisocyanate MDI100 in stages to control the reaction The temperature is 80±5°C, and the reaction is 2h. After the time is up, cool down to 50°C, and start to add 150 grams of alkoxysilicone oil BD-3253 prepared in advance dropwise, at a rate of 2 drops per second, and control the reaction temperature at 80±5°C until the addition is completed. The reaction was continued for 1 hour, and after the time was up, the temperature was lowered and the material was discharged to obtain a prepolymer for adhesive.

Embodiment 2

[0016] Weigh 1600 grams of polyether diol D4000 into a three-necked flask, vacuum dehydrate at 120±5°C for 2~3 hours, then cool down to below 60°C, add 360 grams of diphenylmethane diisocyanate MDI100 in stages to control the reaction The temperature is 80±5°C, and the reaction is 2h. After the time is up, cool down to 50°C, and start to add 150 grams of alkoxysilicone oil BD-3253 prepared in advance dropwise, at a rate of 2 drops per second, and control the reaction temperature at 80±5°C until the addition is completed. The reaction was continued for 1 hour, and after the time was up, the temperature was lowered and the material was discharged to obtain a prepolymer for adhesive.

Embodiment 3

[0018] Weigh 2000 grams of polyether diol D4000 into a three-necked flask, vacuum dehydrate at 120±5°C for 2~3 hours, then cool down to below 60°C, add 440 grams of diphenylmethane diisocyanate MDI100 in stages to control the reaction The temperature is 80±5°C, and the reaction is 2h. After the time is up, cool down to 50°C, and start to add 150 grams of alkoxysilicone oil BD-3253 prepared in advance dropwise, at a rate of 2 drops per second, and control the reaction temperature at 80±5°C until the addition is complete. The reaction was continued for 1 hour, and after the time was up, the temperature was lowered and the material was discharged to obtain a prepolymer for adhesive.

[0019] The comparative example of the application of the prepolymer of the present invention in the adhesive:

[0020] Take a commercially available conventional polyether-MDI (without any modification) prepolymer (commercially available brand is 6605E), and an appropriate amount of the silicone-mo...

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Abstract

The invention relates to a substance formed by preliminary polymerization of a monomer, in particular to a synthesis method and application of an organosilicon-modified polyurethane prepolymer. It is made by using diphenylmethane diisocyanate (MDI100) successively with polyether diol (molecular weight 4000, commercially available brand D4000) and alkyl hydroxy silicone oil (take hydroxyl modified polydimethylsiloxane, commercially available brand BD-3253 (molecular weight: 3000) was polymerized to obtain a silicone-modified polyurethane-NCO-based prepolymer. It solves the problem of relatively poor salt spray corrosion resistance of polyurethane adhesives in the prior art, thereby realizing the technical requirements of marine adhesives.

Description

technical field [0001] The invention relates to a substance formed by preliminary polymerization of a monomer, in particular to a synthesis method and application of an organosilicon-modified polyurethane prepolymer. Background technique [0002] Silicone has been used for the modification of polyurethane for a long time, because the Si-O-Si bond in the molecular chain has a large cohesive energy and has excellent properties such as high temperature resistance and hydrolysis resistance, and the chain is flexible. chain, has the advantages of good low temperature flexibility, low surface tension, and good biocompatibility. Using it to physically or chemically modify polyurethane prepolymers can improve the overall performance of the adhesive, especially the weatherability and durability of the adhesive. Sea corrosion resistance. The literature shows that most of the research on silicone-modified polyurethanes is reflected in the use of silane to partially or completely end t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/61C08G18/48C09J175/08
CPCC08G18/48C08G18/61C09J175/08
Inventor 许愿王建斌陈田安解海华
Owner YANTAI DARBOND TECH
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