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Solvent type polyurethane structure adhesive and preparation method thereof

A polyurethane and adhesive technology, applied in the field of polyurethane materials, can solve the problems of toxic unblocking agents, etc., and achieve the effects of good operating performance, energy saving, and avoiding damage

Inactive Publication Date: 2015-09-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are mainly blocking curing agents and polyurethane prepolymer systems, but the unblocking of blocking curing agents in blocking curing agents and polyurethane prepolymer systems will release toxic unblocking agents

Method used

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  • Solvent type polyurethane structure adhesive and preparation method thereof
  • Solvent type polyurethane structure adhesive and preparation method thereof
  • Solvent type polyurethane structure adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 50.00 grams of PCL (M n =2000) into a 500mL three-necked flask, dehydrated at 115°C for 1 hour and then cooled to 60°C. Take 0.04 g of DBTDL, 18 g of TDI and 30 g of butanone into a three-necked flask, stir and react at 80°C for 2 hours, then add 12 g of PHE and react at 80°C for 5 hours to obtain a blocked polyurethane prepolymer (component A).

[0043] Then 3 grams of TMP, 3.3 grams of CO and 10 grams of ethyl acetate were mixed uniformly to obtain component B, and then mixed with 0.1 grams of 2,6-di-tert-butyl-p-cresol, 0.5 grams of KH560, 7 grams of nano-silica, The above-mentioned closed polyurethane prepolymer is stirred and mixed uniformly to obtain a solvent-type polyurethane structural adhesive.

[0044] According to actual construction needs, the ratio of component A and component B can also be adjusted to obtain adhesives with different bonding strengths and thermodynamic properties.

Embodiment 2

[0046] 80.00 grams of PEA (M n =2000) into a 500mL three-necked flask, dehydrated at 115°C for 1 hour and then cooled to 60°C. Take 0.04 g of DBTDL, 10 g of MDI and 70 g of butanone into a three-necked flask, stir and react at 70°C for 2 hours, then add 0.95 g of DEG, and react at 60°C for 5 hours to obtain a hydroxyl-terminated polyurethane prepolymer.

[0047] Then add 6.25 grams of HDIT, 1.40 grams of PHE, 0.02 grams of DBTDL and 10 grams of butyl acetate into a 50mL three-necked flask, react at 85°C for 3 hours under stirring conditions to obtain a blocked isocyanate curing agent, and then stir and mix with the above polyurethane prepolymer After uniformity, a solvent-based polyurethane structural adhesive is obtained.

[0048] According to actual construction needs, the ratio of the two components can also be adjusted to obtain adhesives with different bonding strengths and thermodynamic properties.

[0049] If other conditions of this embodiment remain unchanged, and D...

Embodiment 3

[0052] 50.00 grams of PBA (M n =3200) into a 500mL three-neck flask, dehydrated at 115°C for 1 hour and then cooled to 60°C. 0.02 g of DBTDL, 2.72 g of TDI and 55 g of methyl ethyl ketone were added into a three-necked flask, stirred and reacted at 80° C. for 2 hours to obtain a hydroxyl-terminated polyurethane prepolymer PU-CA.

[0053] Then, take 80 grams of TDI and 230 mL of methyl ethyl ketone and add them to a 500 mL three-necked flask, raise the temperature to 65 ° C, add 20.5 grams of TMP under stirring, complete the addition within 2 hours, keep warm at 70 ° C for 2 hours, and then add 51.9 grams of PHE , react at 80°C for 4 hours, and cool to room temperature to obtain blocked isocyanate curing agent PU-CA.

[0054] Finally, according to construction requirements, a certain proportion of blocked isocyanate curing agent and the above polyurethane prepolymer are stirred and mixed evenly to obtain a solvent-based polyurethane structural adhesive.

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Abstract

The invention discloses a method for preparing a solvent type polyurethane structure adhesive. The method is characterized in that an isocyanate solidifying agent sealed by a sealing agent and a polyurethane prepolymer at the sealed end of hydroxyl group are mixed to obtain a polyurethane adhesive, or the polyurethane prepolymer sealed by the sealing agent and a trihydroxy compound are mixed, or the polyurethane prepolymer sealed by the sealing agent and the isocyanate solidifying agent sealed by the sealing agent are mixed to be added into an adsorbing filling material to obtain the polyurethane adhesive. When in use, the adhesive is heated and unsealed to obtain the isocyanate solidifying agent or polyurethane prepolymer containing NCO, and reacts with polyurethane prepolymer or the trihydroxy compound to obtain cross-linked and cured polyurethane. The adhesive can be stably stored at the room temperature, can be heated to obtain reaction type bi-component when in construction, and is different from the conventional bi-component solvent type polyurethane which wastes time in the processes of metering, mixing and the like, the construction process is simple, the performance adjustment of the single component polyurethane system is realized, and the unsealed unsealing agent cannot overflow.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a blocked isocyanate and a solvent-type polyurethane structural adhesive and a preparation method thereof. Background technique [0002] According to the book "Polyurethane Adhesives--Preparation, Formulation and Application" (Chemical Industry Press, 2009 edition), solvent-based polyurethane adhesives are mainly divided into one-component solvent-based adhesives and two-component solvent-based adhesives. One-component solvent-based adhesives are a type of single-component adhesives formed by adding curing agents, additives, fillers, etc. to the synthetic polyurethane prepolymer, and are divided into curing type, hot-melt type, sealing type, radiation curing type, etc. There are several kinds, which have the advantages of convenient processing and use, long storage time and so on. For example, one-component moisture-curing polyurethane adhesives are wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J11/06C09J11/04C09J11/08C08G18/66C08G18/12
Inventor 张兴元李军配王怀伟贺晨许飞杨劲松张国庆
Owner UNIV OF SCI & TECH OF CHINA
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