Reactive polyurethane hot melt adhesive for PVC and preparation method thereof

A polyurethane hot-melt adhesive and reactive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as bonding failure, large climate impact, and inability to avoid sudden climates. Achieve the effect of mild conditions and simple preparation method

Active Publication Date: 2019-05-21
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research direction of reactive polyurethane hot melt adhesives for PVC mainly focuses on improving the final bonding strength. In actual production, many reactive polyurethane hot melt adhesive companies often distinguish between winter and summer formulas according to regional climate problems, but often cannot avoid sudden climates or fail to switch as expected, resulting in bonding failure Or it cannot meet the customer's requirements, which brings a lot of inconvenience. For example, the glue is required to have a short opening time in summer and can be positioned quickly, while the winter requires a long opening time to prevent the surface temperature of the substrate from being too low and the degree of wetting is insufficient. Connection failure
Therefore, reactive polyurethane hot melt adhesives for PVC have the disadvantages of poor initial adhesion and greater climate impact.

Method used

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  • Reactive polyurethane hot melt adhesive for PVC and preparation method thereof
  • Reactive polyurethane hot melt adhesive for PVC and preparation method thereof
  • Reactive polyurethane hot melt adhesive for PVC and preparation method thereof

Examples

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preparation example Construction

[0052] The present invention also provides a preparation method of the reactive polyurethane hot-melt adhesive for PVC described in the above technical solution, comprising the following steps:

[0053] Mix low hydroxyl value crystalline polyester polyols, polyether polyols, amorphous polyester polyols, liquid polyester polyols, antioxidants, and tackifying resins for dehydration, then add isocyanate for reaction, and finally add adhesion promoters The agent and catalyst are vacuum defoamed, and the reactive polyurethane hot melt adhesive is obtained after uniform dispersion.

[0054] The present invention firstly mixes low hydroxyl value crystalline polyester polyols, polyether polyols, amorphous polyester polyols, liquid polyester polyols, antioxidants, and tackifying resins; the mixing process is preferably specifically:

[0055] Add low hydroxyl value crystalline polyester polyol, liquid polyester polyol, amorphous polyester polyol, and antioxidant into the reaction kettle...

Embodiment 1

[0069] The formula quantity of the raw materials used in Example 1 is shown in Table 1.

[0070] The formula quantity of raw material used in table 1 embodiment 1

[0071]

[0072]

[0073] Add low hydroxyl value crystalline polyester polyol, liquid polyester polyol, amorphous polyester polyol, and antioxidant into the reaction kettle according to the formula amount, raise the temperature to 80°C, add the formula amount of tackifying resin, and heat up to 105℃~130℃, dehydrate for 2 hours under the condition of vacuum degree ≤-0.095MPa, cool down to 90℃ after water content ≤500ppm, add the formula amount of isocyanate, heat up to 130℃, react for 45min, add the formula after the reaction is complete A certain amount of adhesion promoter and catalyst, vacuum defoaming for 0.5h, after stirring and dispersing evenly, it can be glued and filled to obtain a reactive polyurethane hot melt adhesive for PVC.

Embodiment 2

[0075] The formulation amount of the raw materials used in Example 2 is shown in Table 2.

[0076] Table 2 The formula quantity of raw material used in embodiment 2

[0077] raw material

[0078] Add low hydroxyl value crystalline polyester polyol, liquid polyester polyol, amorphous polyester polyol, and antioxidant into the reaction kettle according to the formula amount, raise the temperature to 80°C, add the formula amount of tackifying resin, and heat up to 105℃~130℃, dehydrate for 2 hours under the condition of vacuum degree ≤-0.095MPa, cool down to 90℃ after water content ≤500ppm, add the formula amount of isocyanate, heat up to 130℃, react for 45min, add the formula after the reaction is complete A certain amount of adhesion promoter and catalyst, vacuum defoaming for 0.5h, after stirring and dispersing evenly, it can be glued and filled to obtain a reactive polyurethane hot melt adhesive for PVC.

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Abstract

The invention provides a reactive polyurethane hot melt adhesive for PVC. The reactive polyurethane hot melt adhesive for PVC is prepared from the following raw materials in parts by weight: 100 partsof low hydroxyl value crystalline polyester polyol, 0-350 parts of polyether polyol, 30-60 parts of amorphous polyester polyol, 0-350 parts of liquid polyester polyol, 70-110 parts of isocyanate, 35-250 parts of tackifying resin, 0.5-5 parts of an adhesive force accelerant, 0.5-5 parts of an antioxidant and 0.01-0.15 part of a catalyst. The hydroxyl value of the low hydroxyl value crystalline polyester polyol is 10-16 KOH/mg and the hydroxyl value of the amorphous polyester polyol is 18-56 KOH/mg. Compared with the prior art, besides characteristics of a common reactive polyurethane hot meltadhesive for splicing a PVC substrate, the reactive polyurethane hot melt adhesive for PVC provided by the invention also has a relatively high initial viscous force, can position quickly, is free ofupwarps in the assembling process and has good climate applicability.

Description

technical field [0001] The invention relates to the technical field of polyurethane sealants, and more specifically relates to a reactive polyurethane hot-melt adhesive for PVC and a preparation method thereof. Background technique [0002] The synthesis of reactive polyurethane hot melt adhesive is a process of combining chemical reaction and physical mixing. The chemical reaction refers to the reaction between isocyanate and polyol compounds. The isocyanate is diphenylmethane diisocyanate (MDI for short), and Polyol compounds are polyesters and polyethers with an average molecular weight of 1000-8000. 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 partly cross-linked network structure, which makes the bonding strength, chemical resistance, heat resistance, and hydrolysis resistance better than ordinary hot melt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/06C09J175/08C09J11/08
Inventor 朱成伟何永富陶小乐陈晨张国锋
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD
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