Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 promotion of thermoplastic polyurethane materials, higher requirements are put forward for its performance in many fields. In terms of hot melt adhesives, some substrates are low-polar or non-polar materials such as polyethylene, polypropylene, and aluminum foil. Conventional TPU hot-melt adhesives cannot meet the requirements, and EVA or polyolefin hot-melt adhesives can be used for bonding, but there are major disadvantages in terms of hardness and strength.
[0004] For seamless shoe materials and clothing textile fields, there are high requirements for the resilience of materials. Currently, the high resilience adhesives used in the market generally use HSM’s 4902 products, which must use triazine chain extenders, which is expensive. , and the initial flow temperature of the product is generally 135 ° C, and the heat activation temperature is > 160 ° C. Therefore, the current market needs polyurethane hot melt adhesives with the characteristics of low polarity, high resilience, and low temperature bonding.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Hydroxyl valueaaaaaaaaaa
Acid valueaaaaaaaaaa
Hydroxyl valueaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com