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Preparation method of polyurethane hot melt adhesive adhered with lower surface energy material

A polyurethane hot-melt adhesive, low surface energy technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of poor bonding performance of low surface energy materials, and overcome the difference in expansion coefficient. , the effect of excellent low surface energy bonding properties, good flexibility and bulk tensile strength

Active Publication Date: 2018-02-02
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the disadvantage of poor adhesion to low surface energy materials in the prior art polyurethane hot melt adhesives, the present invention provides a method for preparing polyurethane hot melt adhesives that can be bonded to low surface energy materials. The prepared polyurethane Hot melt adhesive is a one-component moisture-curing polyurethane adhesive, which is a solvent-free and environmentally friendly adhesive

Method used

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  • Preparation method of polyurethane hot melt adhesive adhered with lower surface energy material
  • Preparation method of polyurethane hot melt adhesive adhered with lower surface energy material
  • Preparation method of polyurethane hot melt adhesive adhered with lower surface energy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add 20 parts of hydroxyl-terminated polybutadiene liquid rubber (HTPB), 15 parts of polyether polyol PPG210, and 4 parts of adhesion promoter 2,2 dimethylol butyric acid into the reaction kettle, at 110 ° C, Dehydration at -0.095MPa for 2 hours, lower the temperature to 80°C, add 0.05 part of dibutyltin dilaurate, 22 parts of toluene diisocyanate TDI80, stir at 700 rpm, and react at 80°C for 1 hour. Then add 15 parts of reactive end-capping coupling agent mercaptopropyltriethoxysilane (KH-580) and react at 70° C. for 2 hours to obtain a prepolymer end-capped by the coupling agent.

[0028] 2) Dehydrate 60 parts of polyester polyol CMA-66 and 15 parts of polyether polyol PTMG3000 at 120°C and -0.095MPa for 2 hours. After dehydration, add 4,4' diphenylmethane diisocyanate MDI 35 parts, stirred at a speed of 700 rpm, reacted at 110°C for 3 hours, then added 10 parts of the coupling agent-capped prepolymer prepared in step 1 and 0.1 part of dimorpholino diethyl ether, R...

Embodiment 2

[0030]1) Add 5 parts of polybutadiene polyether glycol, 40 parts of polyether polyol PTMG2000, and 8 parts of 4-hydroxybutyric acid into the reaction kettle, dehydrate at 110°C and -0.095MPa for 2 hours, and cool down to 80°C , add 0.01 part of stannous octoate, 10 parts of polyisocyanate Desmodur N3300, stir at a speed of 400 rpm, react at 65 ° C for 3 hours, then add reaction-blocking coupling agent mercaptopropyltrimethoxysilane ( 2 parts of KH-590) were reacted at 90°C for 5 hours to obtain a prepolymer capped by a coupling agent.

[0031] 2) Dehydrate 35 parts of polyester polyol CMA-44 and 40 parts of polyether polyol PPG220 at 120°C and -0.095MPa for 2 hours. Stir at a speed of 1 / min, react at 120°C for 1 hour, then add 35 parts of the coupling agent-capped prepolymer prepared in step 1 and 0.001 part of triethylenediamine, raise the temperature to 110°C, and evacuate to - Below 0.095MPa, remove the air bubbles for 30 minutes, discharge the material, and seal the packa...

Embodiment 3

[0033] 1) Add 13 parts of hydroxyl-terminated butadiene acrylonitrile liquid rubber (HTBN), 28 parts of polyether polyol PTMG3000, and 1 part of dodecenyl succinic acid into the reaction kettle. Dehydrate for 2 hours, lower the temperature to 80°C, add 0.03 parts of triethylenediamine, 40 parts of toluene diisocyanate TDI 100, stir at 550 rpm, react at 85°C for 2 hours, then add reaction-capped coupling Add 8 parts of ethylenediaminopropyltrimethoxysilane (KH-792) to react at 80°C for 3 hours to prepare a prepolymer capped by a coupling agent.

[0034] 2) Dehydrate 47 parts of polyester polyol CMA-66 and 27 parts of polyether polyol PPG220 at 120°C and -0.095MPa for 2 hours. After dehydration is completed, add 24 parts of Desmodur N3300. Stir at a rotating speed, react at 100°C for 3 hours, then add 23 parts of the coupling agent-capped prepolymer prepared in step 1, 0.05 part of stannous octoate, heat up to 110°C, evacuate to below -0.095MPa, remove Bubbling for 30 minutes, ...

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Abstract

The invention relates to a preparation method of a polyurethane hot melt adhesive adhered with a lower surface energy material. The polyurethane hot melt adhesive prepared by the method provided by the invention has favorable flexibility and body tensile strength, can overcome the influence of an expansion factor difference between different materials, and is uniform in stress distribution so as to adapt to base materials in different types; an anti-dropping performance is good: the times for dropping a roller is higher than 300 times; the adhesion strength is high: the adhesion strength of PEI and a nickel-plated steel disc is higher than 6.0MPa; salt spray resistant and ageing-resistant performances are good: no damage is caused after a salt spray test is carried out for 500 hours, and no remarkable intensity attenuation is caused after a dual-85 test is carried out for 1000 hours.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane hot melt adhesive capable of bonding with low surface energy materials, and belongs to the technical field of chemical adhesives. Background technique [0002] As we all know, the current design trend of mobile phones and electronic wearable products is moving towards lighter, thinner, and more beautiful trends. Hot-melt adhesives are commonly used for the structural bonding of the frames and casings. Especially polyurethane hot melt adhesive (PUR), because of its excellent flexibility, weather resistance and low temperature resistance, and excellent bonding strength, it is widely used in the bonding of mobile phone frames or tablets. [0003] With the development of new materials, the materials used in mobile phones and electronic wearable products are also changing rapidly, from the original polycarbonate (PC) to the current nylon glass fiber and polyetherimide (PEI), etc. Materials wit...

Claims

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Application Information

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IPC IPC(8): C09J175/06C08G18/76C08G18/73C08G18/69C08G18/66C08G18/48C08G18/42C08G18/34C08G18/12
CPCC08G18/12C08G18/348C08G18/4238C08G18/48C08G18/6692C08G18/698C08G18/73C08G18/7614C08G18/7671C09J175/06C08G18/42
Inventor 姜贵琳王建斌陈田安解海华
Owner YANTAI DARBOND TECH
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