Low-polarity and high-resilience polyurethane hot melt adhesive as well as preparation method and application thereof

A polyurethane hot melt adhesive and thermoplastic polyurethane technology, applied in the field of polyurethane materials, can solve the problems affecting the application of thermoplastic polyurethane hot melt adhesives, easy to form cross-linked network, poor hydroxyl reactivity, etc., and achieve excellent resilience, surface polarity and surface The effect of low free energy and enhanced polarity

Active Publication Date: 2020-03-24
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Thermoplastic polyurethane elastomer (TPU) has the advantages of wide hardness range, excellent wear resistance, mechanical strength, water resistance, oil resistance, chemical corrosion resistance, mold resistance and environmental friendliness, but conventional thermoplastic polyurethane materials are polar Materials, mixed with non-polar or low-polar materials, or used as hot-melt adhesives to bond non-polar and low-polar materials, there are problems such as poor compatibility and weak adhesion, which affect thermoplastic polyurethane hot-melt adhesives. Applications
Hydrogenated hydroxyl-terminated polybutadiene is generally used to prepare liquid rubber. It lacks functionality due to its single structure. If it is directly used as a soft segment for the synthesis of polyurethane materials, it has poor hydroxyl reactivity, is easy to form a cross-linked network, and has poor mechanical properties. Odor and other problems, so it is less used in the field of polyurethane
[0003] With the promo

Method used

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  • Low-polarity and high-resilience polyurethane hot melt adhesive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a polyurethane hot-melt adhesive with low polarity and high resilience, the steps are as follows:

[0026] (1) Preparation of modified hydroxyl-terminated hydrogenated polybutadiene polyols

[0027] Put 500kg of hydroxyl-terminated hydrogenated polybutadiene with a molecular weight of 1000g / mol and 500kg of caprolactone monomer into the reaction kettle, raise the temperature to 120°C under the protection of nitrogen, add 0.1kg of catalyst tetraisopropyl titanate, stir evenly and then raise the temperature to 160°C, react for 20 hours, pump the system to a vacuum of -0.095MPa and react for 3 hours to obtain the modified hydroxyl-terminated hydrogenated polybutadiene polyol. The hydroxyl value is 57.1mgKOH / g and the acid value is 0.02 by titration analysis method. mgKOH / g, the molecular weight is 1965g / mol;

[0028] (2) Preparation of thermoplastic polyurethane elastomer

[0029] The modified hydroxyl-terminated hydrogenated polybutadiene polyol ...

Embodiment 2

[0032] A preparation method of a polyurethane hot-melt adhesive with low polarity and high resilience, the steps are as follows:

[0033] (1) Preparation of modified hydroxyl-terminated hydrogenated polybutadiene polyols

[0034] Put 2000kg of hydroxyl-terminated hydrogenated polybutadiene with a molecular weight of 2000g / mol and 1100kg of caprolactone monomer into the reaction kettle, and raise the temperature to 120°C under the protection of nitrogen, add 0.35kg of the catalyst stannous octoate, stir evenly, and raise the temperature to 160°C. React for 20 hours, pump the system to a vacuum of -0.095MPa and react for 3 hours to obtain a modified hydroxyl-terminated hydrogenated polybutadiene polyol. The hydroxyl value is 35.5 mgKOH / g and the acid value is 0.023 mgKOH / g by titration analysis. , the molecular weight is 3169.5g / mol;

[0035] (2) Preparation of thermoplastic polyurethane elastomer

[0036]Take the modified hydroxyl-terminated hydrogenated polybutadiene polyol,...

Embodiment 3

[0039] A preparation method of a polyurethane hot-melt adhesive with low polarity and high resilience, the steps are as follows:

[0040] (1) Preparation of modified hydroxyl-terminated hydrogenated polybutadiene polyols

[0041] Put 1500kg of hydroxyl-terminated hydrogenated polybutadiene with a molecular weight of 3000g / mol and 450kg of caprolactone monomer into the reaction kettle, raise the temperature to 120°C under the protection of nitrogen, add 0.35kg of organic bismuth catalyst, stir evenly and raise the temperature to 160°C, and react After 20 hours, the system was evacuated to a vacuum of -0.095MPa and reacted for 3 hours to obtain the modified hydroxyl-terminated hydrogenated polybutadiene polyol. The titration analysis method was used to test the hydroxyl value of 28.77mgKOH / g and the acid value of 0.03mgKOH / g. The molecular weight is 3899.9g / mol;

[0042] (2) Preparation of thermoplastic polyurethane elastomer

[0043] Take the modified hydroxyl-terminated hydr...

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Abstract

The invention belongs to the technical field of polyurethane materials, and particularly relates to a low-polarity and high-resilience polyurethane hot melt adhesive as well as a preparation method and application thereof. The polyurethane hot melt adhesive disclosed by the invention has the advantages of low polarity, high resilience, low thermal activation temperature, low pressure change, low density, low dielectric constant and the like. Specifically, the dyne value is less than or equal to 32mN/m, the hardness is 60-80A, the initial flow temperature Tfb is less than or equal to 135 DEG C,the 200% fixed elongation permanent deformation rate is less than or equal to 10%, and the 24-hour compression deformation at 100 DEG C is less than or equal to 30%. The problem that the conventionalTPU cannot be adhered to a low-polarity or non-polar material due to high polarity and is poor in resilience can be solved. The surface drying non-sticking time is obviously shorter than that of a conventional TPU hot melt adhesive product, and positioning and sticking in use are better facilitated.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a polyurethane hot-melt adhesive with low polarity and high resilience, a preparation method and application thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) has the advantages of wide hardness range, excellent wear resistance, mechanical strength, water resistance, oil resistance, chemical corrosion resistance, mold resistance and environmental friendliness, but conventional thermoplastic polyurethane materials are polar Materials, mixed with non-polar or low-polar materials, or used as hot-melt adhesives to bond non-polar and low-polar materials, there are problems such as poor compatibility and weak adhesion, which affect thermoplastic polyurethane hot-melt adhesives. Applications. Hydrogenated hydroxyl-terminated polybutadiene is generally used to prepare liquid rubber. It lacks functionality due to its single struc...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J153/02C08G18/42C08G18/62
CPCC08G18/4277C08G18/6208C08L2207/04C09J175/06C08L53/025
Inventor 刘德富陈洋宋红玮高玉宝刘建文
Owner MIRACLL CHEM
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