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PUR hot melt adhesive for composite board and preparation method of PUR hot melt adhesive

A technology of hot-melt adhesive and composite board, applied in the direction of adhesive, adhesive type, polyurea/polyurethane adhesive, etc., can solve the problems of high preparation cost, complicated preparation process, unfavorable industrialization development, etc., and achieve final adhesion High, excellent aging resistance, good tensile properties

Active Publication Date: 2021-02-05
上海都昱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent with the patent number CN105820308B uses polyester polyol, diisocyanate, and chain extender as the basic raw materials, together with catalyst, leveling agent, nucleating agent and other additives, and undergoes high-temperature polymerization to form a moisture-responsive polyurethane hot melt Adhesive, although the polyurethane hot melt adhesive prepared by it has good initial adhesion, but the preparation process is complicated and the preparation cost is high, which is not conducive to the development of industrialization

Method used

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  • PUR hot melt adhesive for composite board and preparation method of PUR hot melt adhesive
  • PUR hot melt adhesive for composite board and preparation method of PUR hot melt adhesive

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preparation example Construction

[0042] The second aspect of the present invention also provides a kind of preparation method of PUR hot-melt adhesive for composite board as described above, comprising the following steps:

[0043] S1, put the polyol polymer and thermoplastic resin into the reaction kettle, heat it to 110-120°C to melt it completely, vacuum dehydrate it under the condition of constant stirring until the water content is lower than 200ppm, then add polyisocyanate, under the protection of inert gas Next, stir and react for 2 to 3 hours, then add silane coupling agent and other additives, stir and react for 0.5 to 1 hour to obtain PUR hot melt adhesive.

[0044] The third aspect of the present invention provides an application of PUR hot melt adhesive for composite boards in the field of board composites.

Embodiment 1

[0048] Example 1 provides a PUR hot melt adhesive for composite boards, including 60 parts of polyol polymer, 25 parts of polyisocyanate, 20 parts of thermoplastic resin, 1 part of silane coupling agent, and 3 parts of other auxiliary agents in parts by weight. .

[0049] The polyol polymer includes 10% of crystalline polyester polyol, 45% of non-crystalline polyester polyol, 25% of polypropylene glycol and 20% of castor oil modified polyol by mass percentage.

[0050] The number-average molecular weight of the crystalline polyester polyol is 2000, and the hydroxyl value is 47-54 mgKOH / g (purchased from Kaiyin Chemical, brand: Evonik, model: Dynacoll 7362).

[0051] The number-average molecular weight of the non-crystalline polyester polyol is 2000, and the hydroxyl value is 50-60 mgKOH / g (purchased from Kaiyin Chemical, brand: Evonik, model: Dynacoll 7110).

[0052] The number average molecular weight of the polypropylene glycol is 900-1100, and the hydroxyl value is 102-125...

Embodiment 2

[0063] Embodiment 2 provides a PUR hot melt adhesive for composite boards, including 80 parts of polyol polymer, 35 parts of polyisocyanate, 30 parts of thermoplastic resin, 3 parts of silane coupling agent, and 7 parts of other auxiliary agents in parts by weight. .

[0064] The polyol polymer includes 15% of crystalline polyester polyol, 30% of non-crystalline polyester polyol, 25% of polypropylene glycol and 30% of castor oil modified polyol in terms of mass percentage.

[0065] The number-average molecular weight of the crystalline polyester polyol is 3500, and the hydroxyl value is 27-34 mgKOH / g (purchased from Kaiyin Chemical, brand: Evonik, model: Dynacoll 7360).

[0066] The number-average molecular weight of the non-crystalline polyester polyol is 3000, and the hydroxyl value is 31-39 mgKOH / g (purchased from Kaiyin Chemical, brand: Evonik, model: Dynacoll 7130).

[0067] The number average molecular weight of the polypropylene glycol is 1800-2200, and the hydroxyl va...

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Abstract

The invention discloses a PUR hot melt adhesive for a composite board and a preparation method thereof. The PUR hot melt adhesive comprises the following components in parts by weight: 60 to 80 partsof polyol polymer, 25 to 35 parts of polyisocyanate, 20 to 30 parts of thermoplastic resin, 1 to 3 parts of silane coupling agent and 1 to 7 parts of other auxiliaries. The polyol polymer is preparedfrom the following components in percentage by mass: 10 to 15 percent of crystalline polyester polyol, 30 to 45 percent of amorphous polyester polyol, 20 to 40 percent of polypropylene glycol and 20 to 35 percent of castor oil modified polyol. The PUR hot melt adhesive for the composite board provided by the invention has initial adhesion and high final adhesion; and heat resistance, hydrolysis resistance, aging resistance and the like are excellent. According to the PUR hot melt adhesive disclosed by the invention, the crystalline polyester polyol, the amorphous polyester polyol, the polypropylene glycol and the castor oil modified polyol are mixed for use, so that the PUR hot melt adhesive has good tensile property, wear resistance, flexibility, heat resistance and initial adhesion.

Description

technical field [0001] The invention relates to the technical field of hot-melt adhesives, in particular to a PUR hot-melt adhesive for composite boards and a preparation method thereof. Background technique [0002] According to chemical properties, polyurethane hot melt adhesives can be divided into two categories, one is thermoplastic polyurethane hot melt adhesive (TPU), and the other is reactive polyurethane hot melt adhesive (PUR). Thermoplastic polyurethane hot melt adhesives are liquefied by heating and then solidified by cooling, while reactive polyurethane hot melt adhesives are liquefied by heating and then cross-linked and solidified by cooling and moisture reaction. Reactive polyurethane hot melt adhesive can be divided into moisture curing polyurethane hot melt adhesive and closed polyurethane hot melt adhesive. Moisture-curing polyurethane hot-melt adhesives are based on terminal-NCO-based prepolymers, and are made of thermoplastic resins, tackifying resins, ...

Claims

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Application Information

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IPC IPC(8): C09J175/14C08G18/66C08G18/42C08G18/48C08G18/36
CPCC09J175/14C08G18/6629C08G18/4018C08G18/42C08G18/48C08G18/36
Inventor 贾玉波许红梅
Owner 上海都昱新材料科技有限公司
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