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Synthetic method and application of organosilicon modified polyurethane prepolymer

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

Active Publication Date: 2014-06-11
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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  • Synthetic method and application of organosilicon modified polyurethane prepolymer

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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, control The reaction temperature is 80±5°C, and the reaction is 2h. After the time is up, cool down to 50°C, 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 , continue to react for 1 hour, after the time is up, cool down and discharge to obtain the 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, control The reaction 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 , continue to react for 1 hour, after the time is up, cool down and discharge to obtain the 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, control The reaction 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 , continue to react for 1 hour, after the time is up, cool down and discharge to obtain the 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-modified polyurethane prepolymer prepared in Example 1 ...

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Abstract

The invention relates to a substance initially polymerized from monomers, and specifically relates to a synthetic method and an application of an organosilicon modified polyurethane prepolymer. The synthetic method is used for producing an organosilicon modified polyurethane NCO-terminated prepolymer by virtue of sequenced polymerization reactions of diphenylmethane diisocyanate (MDI100) with polyether glycol and alkylhydroxyl silicone oil, wherein the molecular weight of the polyether glycol is 4000 and the commercial grade of the polyether glycol is D4000; the alkylhydroxyl silicone oil is hydroxyl modified polydimethylsiloxane, the commercial grade of the hydroxyl modified polydimethylsiloxane is BD-3253, and the molecular weight of the hydroxyl modified polydimethylsiloxane is 3000. The synthetic method has the advantages that the problems of poor relative salt spray resistance and corrosion property of a polyurethane adhesive in the prior art are solved, and therefore, the technical requirements of a ship adhesive are met.

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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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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