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A kind of high-hardness polyurethane hot-melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive and high-hardness technology, applied in the field of polyurethane hot-melt adhesive, can solve the problems of difficult processing, poor compatibility, high hardness, high rigidity, etc. Efficient effect

Active Publication Date: 2016-09-14
东莞宏石功能材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the hardness of polyurethane hot melt adhesives currently on the market is at most about 97A / 52D, which cannot meet the needs of higher hardness and high rigidity. If the hardness and rigidity of polyurethane hot melt adhesive products can be improved, it will be more suitable for shoe materials. favorable
At present, the method of hardening polyurethane hot melt adhesives is mostly to add higher hardness engineering plastics, but it is easy to cause the material to be easily brittle, and the compatibility is poor, the surface of the material is prone to unevenness, and the melting point will also increase accordingly. Make post-processing difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a, the parts by weight are 50 parts of polyester polyol, 2 parts of 2,4-MDI, 3 parts of H 12 MDI, 3 parts of IPDI, 0.5 parts of 1,3-butanediol, and 0.5 parts of hydroquinone bis(2-hydroxyethyl) ether were mixed and reacted at a reaction temperature of 180°C to obtain a reactant;

[0039] Among them, polyester polyol is made of diethylene glycol and adipic acid according to the molar ratio of 0.9:1 through vacuum melting method for dealcoholization and dehydration polycondensation. Carry out the initial esterification reaction at low temperature for 2 hours, then raise the temperature to 180°C, and dehydrate under reduced pressure until the hydroxyl value of the polyester polyol is 28mgKOH / g, the acid value is 0.5mgKOH / g, and the Mw is 700;

[0040] b. Add 12 parts of polypropylene, 13 parts of low-density polyethylene, and 10 parts of carbon black into the screw extruder through a powder feeder, and simultaneously add the reactant prepared in step a into the screw extru...

Embodiment 2

[0043] The preparation method of the high-hardness polyurethane hot-melt adhesive of the present embodiment, it comprises the following preparation steps:

[0044] a, 55 parts by weight of polyester polyol, 3 parts of 4,4-MDI, 4 parts of PPDI, 5 parts of HDI, 0.5 parts of ethylene glycol, 0.5 parts of 1,4-cyclohexane Dimethanol, 1 part of resorcinol-bis(β-hydroxyethyl) ether mixed reaction, the temperature of the reaction is 200 ° C, and the reactant is obtained;

[0045] Among them, the polyester polyol is made of a mixture of butanediol, propylene glycol and a mixture of terephthalic acid and isophthalic acid in a molar ratio of 1.1:1 through vacuum melting method for dealcoholization and dehydration condensation. In the method, the raw materials of the above ratio are firstly subjected to the initial esterification reaction at 130°C for 1.8h, then the temperature is raised to 200°C, and the polyester polyol is dehydrated under reduced pressure until the hydroxyl value of th...

Embodiment 3

[0049] The preparation method of the high-hardness polyurethane hot-melt adhesive of the present embodiment, it comprises the following preparation steps:

[0050] A, the polyester polyol that will be 60 parts by weight, the TMXDI of 5 parts, the XDI of 5 parts, the IPDI of 6 parts, the 4-hydroxyethyloxyethyl-1-hydroxyethyl phenylene ether of 1 part, 1 part of resorcinol-bis(β-hydroxyethyl) ether and 1 part of 3-hydroxyethyloxyethyl-1-hydroxyethyl phenylene ether are mixed and reacted at a reaction temperature of 215°C to obtain Reactant;

[0051] Among them, the polyester polyol is a mixture of hexanediol, neopentyl glycol, 2-methylpropanediol and adipic acid, terephthalic acid, isophthalic acid according to the molar ratio of 1.3:1 through the vacuum melting method It is formed by dealcoholization and dehydration polycondensation. In the vacuum melting method, the above ratio of raw materials is firstly subjected to the initial esterification reaction at 140°C for 1.6h, the...

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Abstract

The invention relates to the technical field of polyurethane hot-melt adhesives, in particular to a high-hardness polyurethane hot-melt adhesive and a preparation method thereof. The polyurethane hot-melt adhesive of the present invention is composed of 50-70 parts by weight of polyester polyol, 8-25 Parts of diisocyanate, 0-5 parts of chain extender, 5-35 parts of filler additives; the hardness of the high-hardness polyurethane hot-melt adhesive of the present invention can reach more than 55D, with high modulus, high resilience, The advantages of not being brittle are mainly due to the use of different types of engineering plastics and inorganic additives, which are added during the production of polyurethane to achieve the effect of good compatibility and not being brittle, and the melting point can also be controlled according to requirements, overcoming the The defects of polyurethane hot-melt adhesive products on the market; the preparation method of the present invention is simple and mature, has high production efficiency, and is conducive to popularization and application.

Description

technical field [0001] The invention relates to the technical field of polyurethane hot-melt adhesives, in particular to a high-hardness polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane hot melt adhesive is a kind of chain polymer compound carbamate, which is heated to a certain temperature to be melted and coated on the surface of the substrate, and then solidified after cooling. The curing process mainly utilizes the hydrogen bond in the composition. Physical crosslinking occurs, with excellent toughness and bonding strength. Thermoplastic polyurethane hot-melt adhesive loses hydrogen bond after being heated to a certain temperature and becomes a viscous liquid, and returns to its original physical properties after cooling, so it can be repeatedly heated-cooled and solidified by using this characteristic. This kind of hot-melt adhesive has bonding strength Higher, low temperature resistance, wear res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J11/08C09J11/04C08G18/66C08G18/42
Inventor 刘山荣刘殷良
Owner 东莞宏石功能材料科技有限公司
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