Preparation method of thermoplastic polyurethane elastomer for reactive hot melt adhesive

A technology of thermoplastic polyurethane and hot melt adhesive, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc. Insufficient initial adhesive strength of melt adhesive, adverse effects of operating temperature and opening time, etc.

Active Publication Date: 2021-04-27
LIAONING FIXED STAR FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the present invention provides a kind of preparation that is used for the thermoplastic polyurethane elastomer of reactive polyurethane hot-melt adhesive, solves reactive polyurethane hot-melt adhesive initial bond intensity deficiency, improves tackifying resin and thermoplastic elastomer tackifying ability and Compatibility is difficult to balance, and it will have adverse effects on performance such as operating temperature and opening time and other technical problems

Method used

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  • Preparation method of thermoplastic polyurethane elastomer for reactive hot melt adhesive

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Experimental program
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Effect test

Embodiment 1

[0038] Step 1. Add 80kg of polyester polyol and 5kg of two-terminal hydroxyl polybutadiene to the reactor, wherein polyester polyol is made of polyester polyol P-5 40kg, polyester polyol 356T 25kg, polyester polyol Dynacoll 7130 15kg is mixed, the temperature is controlled at 120°C, the vacuum degree is ≤0.095MPa, and the vacuum dehydration is 2-3h to obtain the mixture;

[0039] Step 2, after dehydration treatment, cool the mixture of step 1 to 80°C, add 15kg of dimer acid diisocyanate, 0.5kg of zinc octylate, 1.0kg of antioxidant 1010 and 2-hydroxy-4-methylbenzidine into the reaction kettle Ketone 1.0kg, stirred at 90r / min, mixed evenly, at 85°C, vacuum degree ≤ 0.095MPa, stirred at 90r / min for 3h; obtained thermoplastic polyurethane elastomer for reactive polyurethane hot melt adhesive;

[0040] Step 3: Packaging and sealing the thermoplastic polyurethane elastomer in step 2 under the protection of nitrogen to isolate oxygen and water vapor to obtain a finished thermoplasti...

Embodiment 2

[0042] Step 1. Add 60kg of polyester polyol and 10kg of two-terminal hydroxyl polybutadiene to the reaction kettle, wherein polyester polyol is made of polyester polyol P-5 30kg, polyester polyol 356T 28kg, polyester polyol Dynacoll 7130 12kg is mixed, the temperature is controlled at 120°C, the vacuum degree is ≤0.095MPa, vacuum dehydration is 2-3h, and the mixture is obtained;

[0043]Step 2, after dehydration treatment, cool the mixture of step 1 to 80°C, add 30kg of dimer acid diisocyanate, 0.5kg of zinc octanoate, 1.0kg of antioxidant 1010 and 2-hydroxy-4-methylbenzophenone to the reaction kettle 1.0kg, 100r / min stirring and mixing evenly, at 85℃, vacuum degree ≤ 0.095MPa, 100r / min stirring reaction for 3h; obtain thermoplastic polyurethane elastomer for reactive polyurethane hot melt adhesive;

[0044] Step 3: Packaging and sealing the thermoplastic polyurethane elastomer in step 2 under the protection of nitrogen to isolate oxygen and water vapor to obtain a finished th...

Embodiment 3

[0046] Step 1. Add 80kg of polyester polyol and 5kg of two-terminal hydroxyl polybutadiene to the reactor, wherein the polyester polyol is composed of polyester polyol 224 38kg, polyester polyol CMA-2066 25kg, polyester polyol Mix 17kg of alcohol P-153, control the temperature at 120°C, vacuum degree ≤0.095MPa, and vacuum dehydrate for 2-3h to obtain the mixture;

[0047] Step 2, after dehydration treatment, cool the mixture of step 1 to 80°C, add 15kg of dimer acid diisocyanate, 0.5kg of zinc octylate, 1.0kg of antioxidant 1010 and 2-hydroxy-4-methylbenzidine into the reaction kettle Ketone 1.0kg, stirred at 100r / min and mixed evenly, stirred and reacted at 100r / min at 85°C and vacuum ≤0.095MPa for 3h; obtained thermoplastic polyurethane elastomer for reactive polyurethane hot melt adhesive;

[0048] Step 3: Packaging and sealing the thermoplastic polyurethane elastomer in step 2 under the protection of nitrogen to isolate oxygen and water vapor to obtain a finished thermopla...

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Abstract

The invention discloses a preparation method of a thermoplastic polyurethane elastomer for a reactive hot melt adhesive. The preparation method comprises the following steps of: adding 50-80 parts of polyester polyol and 5-10 parts of dihydroxy-terminated polybutadiene into a reaction kettle, controlling the temperature to be 115-120 DEG C and the vacuum degree to be less than or equal to 0.095 MPa, and carrying out vacuum dehydration for 2-3 hours; after dehydration treatment, cooling the mixture obtained in the previous step to 78-82 DEG C, adding 10-40 parts of polyisocyanate, 0-0.5 parts of a catalyst, 0-1.0 part of an antioxidant and 0-1.0 part of an anti-yellowing agent into the reaction kettle, stirring at the speed of 80-150 r / min, uniformly mixing, and stirring at the temperature of 80-85 DEG C, the vacuum degree of less than or equal to 0.095 MPa and the speed of 80-150 r / min for reaction for 3 hours; obtaining a thermoplastic polyurethane elastomer for a reactive hot melt adhesive; and packaging and sealing the thermoplastic polyurethane elastomer for the reactive hot melt adhesive in the previous step under the protection of nitrogen to obtain a finished product. The thermoplastic polyurethane elastomer prepared by the invention can improve the initial adhesion strength of a reactive polyurethane hot melt adhesive, increase the melt viscosity and improve the cohesion, has excellent compatibility, and can meet the market requirements at home and abroad.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to the preparation of a thermoplastic polyurethane elastomer used for reactive polyurethane hot melt adhesive (HMPUR), which is used to improve its initial bond strength, increase melt viscosity, and improve the cohesion and compatibility of polyurethane sex. Background technique [0002] Throughout the development of the adhesive industry in recent years, reactive polyurethane hot melt adhesives are one of the fastest growing adhesive varieties. This is not only due to its excellent performance, but also because this type of hot melt adhesive can provide users with excellent environmental friendliness. Unlike ordinary hot melt adhesives, which are easy to deteriorate in bonding strength, reactive polyurethane hot melt adhesives contain terminal isocyanate group (NCO) polyurethane prepolymers, which can react with moisture or active hydrogen substances in the air or on the adheren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/69C08G18/42C08G18/81C08G18/22C09J175/14C09J11/06
CPCC08G18/698C08G18/4202C08G18/8125C08G18/222C09J175/14C09J11/06C08K5/1345C08K5/132
Inventor 于广慧孙海娥肖婷婷李瑶曲文婕李俊锋盛艳霞张于
Owner LIAONING FIXED STAR FINE CHEM
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