Two-component polyurethane sealant

A two-component polyurethane and sealant technology, applied in polyurea/polyurethane adhesives, adhesive types, other chemical processes, etc., can solve the problems of unsatisfactory, high price, long production cycle, etc.

Inactive Publication Date: 2010-09-01
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some enterprises mostly produce one-component polyurethane sealant, which has a high price and complicated process, which cannot meet the needs of the market.
The current production of similar products of component B needs to add additives after the dryer, which requires large investment in equipment, high energy consumption, long production cycle and high cost

Method used

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  • Two-component polyurethane sealant
  • Two-component polyurethane sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 253g of polyether diol into a 1000mL four-necked reaction flask, raise the temperature to 100°C-120°C for 4h in vacuum, cool down below 60°C, add 2.5g of dioctyl phthalate and 5.5g of organic bentonite, stir for 30min Finally, add 30g of diisocyanate, heat up slowly, control the temperature at 80-85°C, react under vacuum for 2.5h, lower the temperature below 60°C, add 50g of plasticizer, vacuum degassing for 1h, and discharge to obtain component A .

[0018] Add 84g polyether triol, 28g castor oil, 440g plasticizer, and 2.6g dispersant to a 1000mL four-necked reaction flask, raise the temperature to 80°C, add 19g organic bentonite, 12g MOCA, 2.6g carbon black, and 129g active calcium hydrogen , fully stirred evenly, heated up to 100°C-120°C for 4 hours in vacuum dehydration, lowered the temperature below 60°C, added 6g of dibutyltin dilaurate, 0.6g of coupling agent, 1.3g of defoamer, stirred fully for 30min, mixed evenly, and discharged , to obtain component B.

Embodiment 2

[0020] Add 253g of polyether diol into a 1000mL four-necked reaction flask, raise the temperature to 100°C-120°C for 4h in vacuum, cool down below 60°C, add 2.5g of dioctyl phthalate and 5.5g of organic bentonite, stir for 30min Finally, add 30g of diisocyanate, heat up slowly, control the temperature at 80-85°C, react under vacuum for 2.5h, lower the temperature below 60°C, add 50g of plasticizer, vacuum degassing for 1h, and discharge to obtain component A .

[0021] Add 65g polyethertriol, 22g castor oil, 343g plasticizer, and 2g dispersant to a 1000mL four-necked reaction flask, raise the temperature to 80°C, add 5g organic bentonite, 8g MOCA, 2g carbon black, and 80g active calcium hydrogen, fully Stir evenly, heat up to 100°C to 120°C for vacuum dehydration for 4 hours, cool down below 60°C, add 4g of dibutyltin dilaurate, 0.44g of coupling agent, 1g of defoamer, stir fully for 30min, mix evenly, and discharge to obtain B component.

Embodiment 3

[0023] Add 228g of polyether diol into a 1000mL four-necked reaction flask, heat up to 100°C to 120°C for 4h in vacuum, cool down below 60°C, add 2.25g of dioctyl phthalate and 5g of organic bentonite, stir for 30min , add 27g of diisocyanate, heat up slowly, control the temperature at 80-85°C, react under vacuum for 2.5h, lower the temperature below 60°C, add 48g of plasticizer, degas in vacuum for 1h, and discharge to obtain component A.

[0024] Add 65g polyether triol, 22g castor oil, 343g plasticizer, and 2g dispersant to a 1000mL four-necked reaction flask, heat up to 80°C, add 15g organic bentonite, 9g MOCA, 2g carbon black, and 130g active calcium hydrogen, fully Stir evenly, heat up to 100°C to 120°C for vacuum dehydration for 4 hours, cool down below 60°C, add 4g of dibutyltin dilaurate, 0.44g of coupling agent, 1g of defoamer, stir fully for 30min, mix evenly, and discharge to obtain B component.

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Abstract

The invention discloses a two-component polyurethane sealant, consisting of a main agent and a solidified agent which have a mass ratio of 1:1.0-1:1.5, wherein the main agent is an end NCO group prepolymer obtained by reaction of vacuum dewatered polyether polyol and polyisocyanate, the weight ratio of mixed polyether polyol is 70%-80%, and the weight ratio of polyisocyanate is 5%-15%; and the solidified agent is formed by dewatering polyether polyol, diethylene triamine, a plasticizer and inorganic fillers to mix with a coupling agent, a catalyst and a defoamer, wherein the weight ratio of the mixed polyether polyol is 10%-20%, the weight ratio of a chain extender is 1%-5%, the weight ratio of the plasticizer is 50%-70%, the weight ratio of inorganic powders is 15%-25%, and the weight ratio of a chemical additive is 1%-2%. The invention has the advantages that the two-component polyurethane sealant has strong adhesion strength, wide adhesion range and excellent water proof property; the technical property achieves the technical requirements of a sealant JC / T 976-2005 for road and bridge caulking and a sealant JC / T482-2003 for polyurethane building, and can satisfy the use requirements in the fields such as road joints, construction engineering, civil engineering, sealing for the joints of metro tunnels and other underground tunnels and the like.

Description

Technical field: [0001] The invention relates to an elastic sealant, especially a two-component polyurethane sealant. Background technique: [0002] The earliest development of waterproof sealing materials in the world was a product developed and produced by the United States in the 1940s. Elastomeric sealants were introduced in the late 50's after oil-based caulks. In 1960, Japan imported polysulfide-based elastic sealants from the United States. In 1967, Japan’s self-produced acrylic and two-component polyurethane-based elastic sealants appeared. Later, single-component sealants were produced in 1969, 1970 and 1972. Divided into polyurethane, two-component silicone and styrene-butadiene elastic sealants. The proportion of elastic sealant in the whole unshaped sealant is increasing year by year. For more than 20 years, polyurethane sealant has replaced the position of polysulfide sealant with the largest amount, and occupies an increasing proportion in construction and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10C08L75/08C09J175/08
Inventor 田凤兰段文锋杨红艳孙金梅
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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