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Preparation method of hydrolysis-resistant polyurethane hot melt adhesive

A polyurethane hot-melt adhesive and hydrolysis-resistant technology, which is applied in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problems of poor water resistance and easy hydrolysis, and improve hydrolysis resistance , improved hydrolysis resistance, and simple operation

Pending Publication Date: 2022-05-03
美瑞新材料创新中心(山东)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because the polyurethane hot melt adhesive matrix is ​​limited by its body strength and molding speed, there are many ester bonds in its structure, which makes it easy to be hydrolyzed and poor in water resistance, which limits its application in some aspects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] A preparation method of a hydrolysis-resistant polyurethane hot-melt adhesive, comprising the steps of:

[0019] (1) Put 1-5 parts of nano-silica and 100 parts of organic solvent in a 500ml three-neck flask, ultrasonically vibrate for 30 minutes, then add 0-1 part of silane coupling agent, continue ultrasonic vibration for 5 minutes, and then transfer to Heat in an oil bath, increase electric stirring, and continue to condense and reflux for 2-5 hours under the condition of 50-70 degrees. Filter the reacted solution with qualitative filter paper, and repeatedly filter with toluene 3 times to wash away the unreacted silane coupling agent. (2) Dissolve the above-filtered silicon dioxide in a three-necked flask with an organic solvent again, and oscillate ultrasonically for 30 minutes, then add 0-1 part of liquefied MDI-100HL, and continue the reaction for 0.5-2 hours. Finally, the reacted slurry was centrifuged at high speed, ultrasonically dispersed and separated three ...

Embodiment 1

[0033] A preparation method of a hydrolysis-resistant polyurethane hot-melt adhesive, comprising the steps of:

[0034] (1) Put 3 parts of nano-silica and 100 parts of organic solvent in a 500ml three-neck flask, ultrasonically vibrate for 30 minutes, then add 0.5 parts of silane coupling agent, continue to ultrasonically vibrate for 5 minutes, and then transfer to an oil bath for heating , increase electric stirring, and continue to condense and reflux for 3 hours under the condition of 60 degrees. Filter the reacted solution with qualitative filter paper, and repeatedly filter with toluene 3 times to wash away the unreacted silane coupling agent.

[0035] (2) Put the above-filtered silicon dioxide into a three-neck flask again with an organic solvent for dissolution, oscillate ultrasonically for 30 minutes, then add 1 part of liquefied MDI-100HL, and continue the reaction for 1 hour. Finally, the reacted slurry was centrifuged at high speed, ultrasonically dispersed and sep...

Embodiment 2

[0041] A preparation method of a hydrolysis-resistant polyurethane hot-melt adhesive, comprising the steps of:

[0042] (1) Put 1 part of nano-silica and 100 parts of organic solvent in a 500ml three-necked flask, ultrasonically vibrate for 30 minutes, then add 1 part of silane coupling agent, continue to ultrasonically vibrate for 5 minutes, and then transfer to an oil bath for heating , increase electric stirring, and continue to condense and reflux for 5 hours under the condition of 70 degrees. Filter the reacted solution with qualitative filter paper, and repeatedly filter with toluene 3 times to wash away the unreacted silane coupling agent.

[0043] (2) Dissolve the above-filtered silicon dioxide in a three-neck flask again with an organic solvent, oscillate ultrasonically for 30 minutes, then add 1 part of liquefied MDI-100HL, and continue the reaction for 0.5 hours. Finally, the reacted slurry was centrifuged at high speed, ultrasonically dispersed and separated three...

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Abstract

The invention belongs to the technical field of polyurethane hot melt adhesive modification, and particularly relates to a preparation method of a hydrolysis-resistant polyurethane hot melt adhesive. The polyurethane hot melt adhesive with excellent hydrolysis resistance is prepared by optimizing a matrix formula and adding the modified inorganic filler and the like. The preparation method comprises the following steps: modifying an inorganic filler by grafting, and grafting liquefied MDI-100HL to the surface of the inorganic filler by using a silane coupling agent, so that the inorganic filler can be uniformly dispersed in a polyurethane matrix, the matrix is reinforced by the inorganic filler, and meanwhile, carbodiimide groups in the MDI-100HL can improve the water resistance of polyurethane through reaction. The modified inorganic filler and a matrix polyurethane adhesive are effectively mixed by a twin-screw extruder to obtain the hydrolysis-resistant polyurethane hot melt adhesive. The product obviously improves the hydrolysis resistance effect of the polyurethane adhesive film.

Description

technical field [0001] The invention relates to the field of thermoplastic polyurethane hot-melt adhesives, in particular to a preparation method of hydrolysis-resistant polyurethane hot-melt adhesives. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Thermoplastic polyurethane hot melt adhesive has developed rapidly in recent years due to its excellent resilience, wear resistance, high thermal lamination strength with the substrate, environmental protection and safety, and simple operation process. It is widely used in clothing, automobiles, etc. General materials cannot be substituted. [0004] However, because the polyurethane hot melt adhesive matrix is ​​limited by i...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J11/04C08G18/66C08G18/48C08G18/42
CPCC09J175/04C09J11/04C08G18/4018C08G18/4854C08G18/4238C08G18/6674C08K2201/011C08K9/06C08K3/36C08K9/04
Inventor 王建刚由可锦高玉宝宋红玮张生
Owner 美瑞新材料创新中心(山东)有限公司
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