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Reactive polyurethane hot melt adhesive with low wall removal rate, and preparation method thereof

A polyurethane hot-melt adhesive, reactive technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low wall peeling rate and high wall peeling rate

Active Publication Date: 2020-02-14
TIANJIN AUSP COMM EQUIP COMPONENTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the technical defects of the prior art, and provides a reactive polyurethane hot-melt adhesive with a low wall-off rate and a preparation method thereof, so as to solve the problem that the conventional reactive polyurethane hot-melt adhesive has a high wall-off rate during use. technical issues

Method used

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  • Reactive polyurethane hot melt adhesive with low wall removal rate, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11

[0041] The components of the reactive polyurethane hot-melt adhesive with low wall removal rate are shown in Table 1.

[0042] The composition formula (unit: parts by weight) of hot melt adhesive provided by Table 1 embodiment 1~11

[0043]

Embodiment 12

[0045] This example is used to investigate the performance of the reactive polyurethane hot-melt adhesive with low wall-off rate provided in the above examples 1-11.

[0046] 1. The test method of the wall-off rate is: after the HM PUR glue packed in an aluminum foil bag is stored at room temperature for 30 days, the aluminum foil bag is torn off, the amount of glue with wall-off phenomenon is observed and counted, and the wall-off rate is calculated. The calculation method is: the number of HMPUR with detachment / total number*100%

[0047] 2. The test method for the initial bonding strength and final bonding strength of a reactive polyurethane hot melt adhesive with a low wall-off rate is: melt the glue, squeeze it onto a PC sheet of 100mm*25mm*3mm under pressure, and use another A PC sheet of the same size is overlapped, the overlapping area is 25mm*10mm, and the thickness is 100μm. Cured in an environment of 25±2℃, 50±5%RH for 30 minutes, and immediately tested the tensile ...

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Abstract

The invention provides a reactive polyurethane hot melt adhesive with low wall removal rate, and a preparation method thereof. According to the technical scheme, the components of a formula are subjected to innovative design to relieve the internal stress of a hot melt adhesive; based on the principle of deformation and energy absorption of an MBS rubber core under the action of stress, the shrinkage stress generated in a cooling process of HM PUR is relieved so as to reduce the wall removal rate; and by adding an acrylate type thermoplastic resin into the formula, the obtained reactive polyurethane hot melt adhesive has good compatibility with polyether polyol, and has solubilizing effect on MBS particles. According to the invention, the internal stress of the hot melt adhesive is fully relieved, and the wall removal rate can be effectively reduced; the dosage of the crystalline polyester is ensured by the formula, so that the good initial bonding force and the final bonding strengthcan be maintained; and on the basis, the invention further provides a preparation method and a pouring process of the hot melt adhesive so as to establish a foundation for large-scale production of the hot melt adhesive.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a reactive polyurethane hot-melt adhesive with a low wall-off rate and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesive (HM PUR) is an adhesive made by reacting with high-boiling point polyisocyanate at high temperature after dehydration of the mixture of polyester polyol, polyether polyvalent PUR and thermoplastic resin. After the reaction, the adhesive is in a liquid state, solidified after cooling, and sealed for storage; it needs to be heated and melted before use. To prepare HM PUR, the molar ratio of isocyanate group (NCO) to hydroxyl group (OH) must be greater than 1. The hydroxyl group (OH) of polyol and isocyanate group (NCO) react to form carbamate, and NCO is blocked after the reaction. The glue is melted and coated on the adherend, and the NCO reacts with the moisture in the environment to finally generate urea bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J133/04C09J151/04C09J11/08C09J11/04
CPCC08L2205/03C09J11/04C09J11/08C09J175/08C08L33/04C08L51/04C08K3/04
Inventor 曹晓明黄世明高鹏
Owner TIANJIN AUSP COMM EQUIP COMPONENTS
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