Reaction type polyurethane hot melt adhesive as well as preparation method and application 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 poor water permeability, difficult application of hot-melt adhesive for car lights, water leakage of car lights, etc.

Active Publication Date: 2018-05-04
HANGZHOU ZHIJIANG SILICONE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent whose publication number is CN103740316A discloses a kind of moisture-curing polyurethane hot melt adhesive for car lamps and its preparation method. However, due to the fact that there are many high and low positions in the tooling in the production process of the car lamp, when the conventional reactive polyurethane hot melt adhesive is used, it often causes uneven glue distribution due to flow, resulting in unstable process; at the same time, the conventional formula The amount of crystalline polyester polyol is relatively large, and the prepolymer formed by reacting with isocyanate has relatively high crosslinking density and poor water permeability. In addition, only the upper part of the lamp is permeable, so the deep curing is slow, often in Some car lights in winter in our country cannot be fully cured for a month, and the glue will flow when heated again, which will cause problems such as water leakage and fogging of the car lights.
[0004] Therefore, the reactive polyurethane in the prior art still has the technical problems of poor high-temperature fluidity, slow deep-layer curing and no thixotropy, making it difficult to realize further application as a hot-melt adhesive for car lights

Method used

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  • Reaction type polyurethane hot melt adhesive as well as preparation method and application thereof
  • Reaction type polyurethane hot melt adhesive as well as preparation method and application thereof
  • Reaction type polyurethane hot melt adhesive as well as preparation method and application thereof

Examples

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preparation example Construction

[0049] The present invention also provides a preparation method of the reactive polyurethane hot-melt adhesive described in the above-mentioned technical scheme, comprising the following steps:

[0050] Mix polyester polyol, polyether polyol, antioxidant and tackifying resin, then dehydrate, then add isocyanate and chain extender to react, and finally add filler and catalyst for vacuum defoaming, and evenly disperse to obtain reactive polyurethane heat Melt glue.

[0051] The present invention first mixes polyester polyol, polyether polyol, antioxidant and tackifying resin; The process of described mixing is preferably specifically:

[0052] Mix polyester polyol, polyether polyol and antioxidant, heat up to 75°C to 85°C, then add tackifying resin to complete the mixing process.

[0053] In the present invention, the dehydration temperature is preferably 105°C to 130°C, more preferably 115°C to 120°C; the vacuum degree of the dehydration is preferably ≤ -0.095MPa; the dehydrat...

Embodiment 1

[0061] The formula quantity of the raw materials used in Example 1 is shown in Table 1.

[0062] The formula quantity of raw material used in table 1 embodiment 1

[0063] raw material

[0064] Add hexanediol adipate, polyether polyol and antioxidant into the reaction kettle according to the formula amount, raise the temperature to 80°C, then add the acrylic resin 2740 in the formula amount, raise the temperature to 115°C-120°C, Dehydrate for 2 hours under the condition of vacuum degree ≤-0.095MPa, until the water content is ≤500ppm, then cool down to 80°C, add the formulated amount of MDI, heat up to 95°C for 1h, then add 1,4-butanediol to continue the reaction for 1h, until After the reaction is complete, finally add the formulated amount of carbon black and catalyst DMDEE, vacuum degassing for 0.5h-1h, until the dispersion is uniform after stirring, then the glue can be discharged and filled, and the reactive polyurethane hot melt adhesive is obtained.

Embodiment 2

[0066] The formulation amount of the raw materials used in Example 2 is shown in Table 2.

[0067] The formula quantity of raw material used in table 2 embodiment 2

[0068]

[0069]

[0070] Add hexanediol adipate, polyether polyol and antioxidant into the reaction kettle according to the formula, raise the temperature to 80°C, then add the TPU in the formula amount, raise the temperature to 115°C~120°C, Dehydrate for 2 hours under the condition of ≤-0.095MPa, until the water content is ≤500ppm, then lower the temperature to 80°C, add the formulated amount of MDI, heat up to 95°C for 1 hour, then add 1,4-butanediol and continue the reaction for 1 hour until the reaction is complete , and finally add the formula amount of white carbon black R974 and catalyst DMDEE, vacuum degassing for 0.5h-1h, until the dispersion is uniform after stirring, then the glue can be filled, and the reactive polyurethane hot melt adhesive is obtained.

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Abstract

The invention provides a reaction type polyurethane hot melt adhesive as well as a preparation method and application thereof. The reaction type polyurethane hot melt adhesive is prepared from the following raw materials with the components in parts by weight: 100-120 parts of polyester polyol, 1-150 parts of polyether polyol, 50-100 parts of isocyanate, 50-350 parts of a modifier, 1-5 parts of achain extender, 1-5 parts of an antioxidant and 0.01-0.1 part of a catalyst, wherein the mass percentage of ethylene oxide in the polyether polyol is 40-50%; the hydroxyl value is 21-112KOH/mg; the modifier consists of a tackifying resin and a filler in a mass ratio of 1-6 to 1. Due to the addition of the polyether polyol with ethylene oxide of a specific mass content, and under coactions of the modifier of components of specific contents, the water permeability of a hot melt adhesive before curing is improved, and the obtained product is good in high-temperature flow-free property, relativelyrapid deep curing property and excellent thixotropy, and can be used as a hot melt adhesive for vehicle lamps.

Description

technical field [0001] The invention relates to the technical field of polyurethane sealant, more specifically, relates to a reactive polyurethane hot melt adhesive and its preparation method and application. Background technique [0002] Reactive polyurethane hot-melt adhesive (PUR for short): The composition of moisture-curing polyurethane hot-melt adhesive contains terminal NCO polyurethane prepolymer. The hydrogen substance reacts to form a partially cross-linked network structure, which makes the adhesive strength, chemical resistance, heat resistance, and hydrolysis resistance better than ordinary hot melt adhesives. Reactive polyurethane hot melt adhesives are widely used in woodworking, textiles, automobiles, electronics, home appliances and other industries. The synthesis of reactive polyurethane hot melt adhesive is a process combining chemical reaction and physical mixing. The chemical reaction of the synthesis of reactive polyurethane hot melt adhesives in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/76C08G18/62C08G18/48C08G18/42C08G18/32C08G18/12
CPCC08G18/12C08G18/4238C08G18/48C08G18/625C08G18/7671C09J175/06C09J175/08C08G18/3206
Inventor 朱成伟陶小乐何永富陈晨张国锋
Owner HANGZHOU ZHIJIANG SILICONE CHEM
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