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Reactive polyurethane hot-melt adhesive for edge sealing in wood industry and preparation method thereof

A polyurethane hot-melt adhesive and reactive technology, which is applied in the field of reactive hot-melt adhesive and its preparation, can solve the problems of low initial bond strength, high proportion of resin and polyol, affecting mechanical strength and performance, etc., to achieve good Effects of heat resistance and storage stability, excellent final peel strength, and excellent initial peel strength

Inactive Publication Date: 2013-04-10
嘉兴市恒泰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot-melt adhesive does not contain water or solvents, and has the advantages of low pollution, but it has the disadvantages of low initial adhesive strength, long open time, etc., and because of its limited heat resistance, it is easy to creep when heated, and easy to become brittle when cold , so it affects the mechanical strength and performance
At the same time, due to its high melting temperature, it is not suitable for heat-sensitive adherends, which limits its application in modern industry.
Although some technologies have successfully prepared reactive polyurethane hot melt adhesives, they are relatively expensive due to the high ratio of resin to polyols.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: 280g crystalline polyester polyol, 200g amorphous polyester polyol, 120g high molecular weight thermoplastic resin, 0.5g antioxidant, 0.5g ultraviolet absorber are added in the reactor, and the temperature rises while stirring To 120°C, keep at 120°C and -0.1MPa pressure for 120 minutes, then cool down to 80°C, add 180g of diphenylmethane diisocyanate at this time, and keep the temperature at about 85°C, react for 60 minutes , then heated up to 95°C, and added 60g of dioctyl phthalate and 160g of silicon micropowder, while stirring at a constant speed, after stirring evenly, continued to heat up to 110°C, added 0.2g of bis(2,6-dimethylmorpholine Ethyl) ether. Finally, the reaction product was poured into a container while it was hot, while filling a small amount of dry nitrogen and sealing it.

Embodiment 2

[0028] Embodiment 2: 200g crystalline polyester polyol, 220g amorphous polyester polyol, 150g high molecular weight thermoplastic resin, 0.8g antioxidant, 0.8g ultraviolet absorber are added in the reactor, and the temperature rises while stirring To 120°C, keep at 120°C and -0.1MPa pressure for 120 minutes, then cool down to 80°C, add 160g of diphenylmethane diisocyanate at this time, and keep the temperature at about 85°C, react for 60 minutes , then the temperature was raised to 95°C, and 40g of dioctyl phthalate and 100g of calcium carbonate were added, while stirring at a constant speed. After stirring evenly, the temperature was raised to 110°C, and 1 g of dibutyltin dilaurate was added. Finally, the reaction product was poured into a container while it was hot, and at the same time filled with a small amount of dry nitrogen and sealed.

Embodiment 3

[0029] Embodiment three: 150g crystalline polyester polyol, 300g amorphous polyester polyol, 150g high molecular weight thermoplastic resin, 1g antioxidant, 0.5g ultraviolet absorber are added in the reactor, and temperature is raised while stirring 120°C, keep at 120°C temperature and -0.1MPa pressure for 120 minutes, then cool down to 80°C, add 170g of diphenylmethane diisocyanate at this time, and keep the temperature at about 85°C, react for 60 minutes, Then the temperature was raised to 95°C, and 50g of phthalate and 120g of ultrafine silicon dioxide were added, while stirring at a constant speed, and after stirring evenly, the temperature was continued to rise to 110°C, and 0.5g of bis(2,6-dimethylmorpholine was added) phenoethyl) ether. Finally, the reaction product was poured into a container while it was hot, and at the same time filled with a small amount of dry nitrogen and sealed.

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Abstract

The invention discloses a reactive polyurethane hot-melt adhesive for edge sealing in wood industry, which is prepared from the following raw materials in percentage by weight: 10-30% of crystalline polyester polyol, 10-30% of amorphous polyester polyol, 8-15% of high-molecular-weight thermoplastic resin, 10-25% of diisocyanate, 1-8% of plasticizer, 10-30% of inorganic filler, 0.05-0.5% of antioxidant and 0.05-0.5% of ultraviolet absorbent. In addition, the invention also discloses a preparation method of the reactive polyurethane hot-melt adhesive. The adhesive disclosed by the invention has the advantages of extremely high drying speed, excellent initial bonding strength and final strength, high heat resistance, high storage stability, excellent environment friendliness, simple preparation technique, low cost and the like. The invention can well satisfy the requirements for edge sealing in wood industry, and is beneficial to industrialization of edge sealing production in wood industry.

Description

technical field [0001] The invention relates to a reactive hot melt adhesive and a preparation method thereof. The hot melt adhesive has the advantages of extremely fast surface drying speed, excellent initial tack strength and final strength, good heat resistance and storage stability, excellent environmental protection, simple preparation process, and low cost. It can well meet the requirements of wood edge banding and is conducive to the industrialization of wood edge banding production. [0002] Background technique [0003] Hot-melt adhesive is a kind of adhesive that is solid at room temperature and melts into liquid when heated to a certain temperature. After coating and wetting the adherend, it can be bonded quickly after pressing and cooling. Hot-melt adhesive does not contain water or solvents, and has the advantages of low pollution, but it has the disadvantages of low initial adhesive strength, long open time, etc., and because of its limited heat resistance, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/06C08G18/42C08G18/44
Inventor 何彬刘新建韩新稳赵满堂
Owner 嘉兴市恒泰化工科技有限公司
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