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Reactive polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, reactive technology, applied in the direction of adhesive additives, non-polymer adhesive additives, polymer adhesive additives, etc., can solve the problems of high melt viscosity, etc., and achieve faster cooling time and easy The effect of industrialization and simple preparation process

Active Publication Date: 2016-11-23
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent 201210013049.1 discloses a polyurethane hot melt adhesive for bonding and its preparation method, using polyester polyol, highly crystalline polyester, diisocyanate and other additives to prepare PUR with good initial adhesion performance, but Its melt viscosity is greater than 7500mPa s (140°C)

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following weight part:

[0038]

[0039] The preparation method of the reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0040] (1), polyoxypropylene glycol (PPG) that 98 weight parts number average molecular weights are 2000, 2 weight parts number average molecular weights are polybutylene adipate diols (PBA) of 2000, 3.9 weight parts rosin The resin is put into the reaction kettle, heated to 110°C, and vacuum dehydrated for 2 hours under stirring, and the vacuum degree is -0.085MPa;

[0041] (2), lower the temperature to 80°C, add 29.6 parts by weight of MDI-50 (a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate), in N 2 Stir and react at 80°C for 1 to 3 hours under protection;

[0042] (3), add 5 parts by weight 3-hydroxyethyl-1,3-oxazolidine again, in N 2 Stir the reaction at ...

Embodiment 2

[0046] The reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following weight part:

[0047]

[0048] The preparation method of the reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0049] (1), 90 parts by weight of PPG with a number average molecular weight of 1000, 10 parts by weight of PBA with a number average molecular weight of 2000, and 6 parts by weight of rosin resin are put into the reactor, heated to 120 ° C, and vacuum dehydrated for 2.5 hours under stirring , the vacuum degree is 0.03MPa;

[0050] (2), then lower the temperature to 80°C, add 44 parts by weight of MDI-50 (a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate), in N 2 Stir the reaction at 78°C for 2.5 hours under protection;

[0051] (3), add 5.6 parts by weight 3-butyl-2-(1-ethylpentyl) oxazolidine again, in N 2 Stir the reaction at 78°C for 0.7 hours under protectio...

Embodiment 3

[0055] The reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following weight portion:

[0056]

[0057] The preparation method of the reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0058] (1), 95 parts by weight of PPG with a number average molecular weight of 1000, 5.0 parts by weight of polycarbonate-1,6-hexanediol ester diol with an average molecular weight of 2000, and 3.0 parts by weight of terpene resin are dropped into the reactor, heated To 130°C, vacuum dehydration for 2.2 hours under stirring, the vacuum degree is -0.06MPa;

[0059] (2), then lower the temperature to 80°C, drop in 26.8 parts by weight of MDI-50, in N 2 Stir the reaction at 80°C for 2 hours under protection;

[0060] (3), add 4.5 parts by weight 2-(1-methylethyl)-3-oxazoline ethanol again, in N 2 Under protection, stir and react at 80°C for 0.6 hours;

[0061] (4), finally add 1.5 parts by we...

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Abstract

The invention discloses a reaction type polyurethane hot-melt adhesive and a preparation method thereof. The hot-melt adhesive comprises the following raw materials in parts by weight: 90-98 parts of polyether polyol, 2-10 parts of polyester polyol, 20-50 parts of isocyanate, 0.5-2 parts of reactive wax, 3-10 parts of tackifying resin, 1-3 parts of an adhesion promoter, 1-10 parts of latent curing agent and 0.1-1 part of a catalyst. The reaction type polyurethane hot-melt adhesive prepared by the invention has low melt viscosity, high initial bonding strength and good final bonding strength, the melt viscosity is smaller than or equal to 2,000 mPa.s at 120 DEG C, the initial peeling strength is greater than or equal to 10 N / 25 mm within 3 min, and the final peeling strength is greater than or equal to 300 N / 25 mm. The reaction type polyurethane hot-melt adhesive belongs to the solvent-free environment-friendly adhesive industry, can be used for bonding plastic, metal, wood and other base materials, can be applied to fields with a low viscosity requirement, such as encapsulation, coating and spraying, and has a favorable market prospect.

Description

technical field [0001] The invention belongs to the technical field of reactive polyurethane hot-melt adhesives, in particular, the invention relates to a reactive polyurethane hot-melt adhesive with low melt viscosity and high initial bond strength and a preparation method thereof. Background technique [0002] In recent years, reactive polyurethane hot-melt adhesives (PUR) have both the advantages of hot-melt adhesives and reactive adhesives. The final adhesive strength, heat resistance, chemical resistance and durability of the adhesive layer have been rapidly developed and play an important role in the construction, automobile and machinery industries. It is estimated that in the next ten years, reactive polyurethane hot melt adhesives will increase at an annual growth rate of 20%. [0003] Melt viscosity and initial bond strength are two important performance indicators of PUR. The lower melt viscosity is convenient for construction, and the higher initial bond strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/06C09J11/08C08G18/76C08G18/48C08G18/42C08G18/62
Inventor 陈精华张健臻陈建军黄恒超
Owner GUANGZHOU BAIYUN CHEM IND