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Reactive polyurethane hot melt adhesive with ultrahigh initial adhesion strength and preparation method thereof

A polyurethane hot-melt adhesive, reactive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of long process time, multi-pressure holding tools, etc. good flexibility

Inactive Publication Date: 2020-08-04
镝普材料(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art that require more pressure-holding tools and longer process time, and propose a reactive polyurethane hot-melt adhesive with ultra-high initial adhesive strength and its preparation method

Method used

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  • Reactive polyurethane hot melt adhesive with ultrahigh initial adhesion strength and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Heat the reactor to a constant temperature of 140°C, add 28 parts of crystalline polyester POL-A3500, 45 parts of liquid polyester CP-2070, and 11 parts of thermoplastic copolyester Dynacoll S 1401 and mix well in the stirred tank. Under the condition of full vacuum, stir and dehydrate for 2 hours until the moisture content of the raw materials in the kettle is lower than 250ppm, and then fill with dry nitrogen to break the vacuum. Lower the temperature to 130°C in a nitrogen atmosphere, add 15 parts of Wanhua's pure MDI100, stir quickly and evenly, control the temperature at 130°C and stir for 50 minutes under full vacuum. Fill with nitrogen to break the vacuum, lower the temperature to 120°C, add 0.3 parts of dibutyltin dilaurate, 0.5 parts of KH560, and 0.3 parts of BYK-361N and stir in full vacuum for 1 hour. Nitrogen is filled to break the vacuum, the material is discharged at a constant temperature of 120°C, and the package is sealed to obtain a reactive polyureth...

Embodiment 2

[0032] Heat the reactor to a constant temperature of 140°C, add 24 parts of crystalline polyester POL-A3500, 6 parts of liquid polyester POL-7112, 38 parts of liquid polyester POL-656, and 11 parts of thermoplastic copolyester Dynacoll S 1401 and 6 parts of Sylvalite RE were mixed evenly in a 100L stirred tank, and stirred and dehydrated at 140°C for 2 hours under full vacuum until the moisture content of the raw materials in the tank was lower than 250ppm, and then filled with dry nitrogen to break the vacuum. Lower the temperature to 130°C in a nitrogen atmosphere, add 13 parts of Wanhua's pure MDI100, stir quickly and evenly, control the temperature at 130°C and stir for 50 minutes under full vacuum. Fill with nitrogen to break the vacuum, lower the temperature to 120°C, add 0.3 parts of triethylenediamine, 0.5 parts of KH570, and 0.3 parts of BYK-361N and stir in full vacuum for 1 hour. Nitrogen is filled to break the vacuum, the material is discharged at a constant temper...

Embodiment 3

[0034] Heat the reactor to a constant temperature of 140°C, add 23 parts of crystalline polyester Hoocker F-931, 10 parts of liquid polyester CP-2110, 37 parts of liquid polyester CP-2056, and 7 parts of thermoplastic copolyester Dynacoll Mix S 1402 and 6 parts of Sylvares TP 2040 in a stirred kettle evenly, and stir and dehydrate at 140°C for 2 hours under full vacuum until the moisture content of the raw materials in the kettle is lower than 250ppm, and then fill with dry nitrogen to break the vacuum. Lower the temperature to 130°C in a nitrogen atmosphere, add 16 parts of pure MDI100 from Wanhua, stir quickly and evenly, control the temperature at 130°C and stir for 50 minutes under full vacuum. Fill with nitrogen to break the vacuum, lower the temperature to 120°C, add 0.3 part of triethylenediamine, 0.8 part of KH590, 0.1 part of BYK-361N and stir for 1 hour under full vacuum. Nitrogen is filled to break the vacuum, the material is discharged at a constant temperature of ...

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Abstract

The invention discloses a reactive polyurethane hot melt adhesive with ultrahigh initial adhesion strength and a preparation method thereof. The reactive polyurethane hot melt adhesive comprises the following components in parts by weight: 15-36 parts of crystalline polyester polyol, 30-60 parts of amorphous liquid polyester polyol, 0-10 parts of tackifying resin, 5-15 parts of thermoplastic copolyester, 10-18 parts of an isocyanate compound, 0.3-1.0 part of a catalyst, 0.5-1.0 part of a silane coupling agent and 0.1-0.5 part of a leveling agent. According to the invention, the thermoplastic copolyester with good compatibility with a polyester system is adopted, and the prepared reactive polyurethane hot melt adhesive has ultrahigh initial adhesion strength and extremely short pressure maintaining time, so that good wettability and flexibility of the product are maintained, and the curing speed is increased.

Description

technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a reactive polyurethane hot-melt adhesive with super high initial adhesive strength and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, a large number of large-screen, hand-held portable electronic products such as smart phones, tablet computers and notebook computers have entered thousands of households and various business units. In a modern production line, these electronic devices need to bond and fix the screen and the frame, the front and rear covers and the frame, and the middle frame. Now the one-component reactive polyurethane hot melt adhesive is widely used in the market for structural fixation. This hot melt adhesive has 100% solid content and is environmentally friendly. It has the advantages of fast curing speed, strong adhesion and high flexibility, and is very suitable for modern i...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J193/04C09J157/02C09J145/00C09J11/08C08G18/76C08G18/42
CPCC08G18/4202C08G18/7671C09J11/08C09J175/06C08L93/04C08L57/02C08L45/00
Inventor 任华伟王亚飞
Owner 镝普材料(深圳)有限公司
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