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

Bio-based reactive polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, bio-based technology, applied in the field of polyurethane hot-melt adhesive, can solve the problems of sizing continuity and stability, poor thermal stability, and reactivity not as good as primary hydroxyl group, etc., to improve the moisture curing effect. , good bonding performance, excellent bonding strength

Pending Publication Date: 2021-12-03
XIAMEN WELDTONE TECH CO LTD
View PDF11 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after reproducing the patented technology, it was found that the technology uses three secondary hydroxyl groups on the initiator to initiate polymerization, and the reactivity is not as good as the primary hydroxyl group; in addition, the polyester triol with more hydroxyl functional groups is applied to the reactive polyol After the ester hot melt adhesive is melted, the melt viscosity of the prepared PUR hot melt adhesive is too large, the sizing temperature is too high, and the melt viscosity of the hot melt adhesive changes greatly during the sizing process, which greatly affects the sizing continuity and stability , indicating that its thermal stability is poor

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
  • Bio-based reactive polyurethane hot melt adhesive and preparation method thereof
  • Bio-based reactive polyurethane hot melt adhesive and preparation method thereof
  • Bio-based reactive polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of bio-based polyester diol A1 is as follows:

[0041] 38.36 g of ε-caprolactone and 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5,5]undecyl Add 3.0 g of alkane into the reaction kettle, add 0.15 g of stannous octoate as the second catalyst, raise the temperature to 115°C under the protection of an inert gas, react for 18 hours, and then cool to room temperature to obtain a solid product, which is bio-based polyester diol A1 . Such as figure 1 It is the 1H-NMR figure of the obtained bio-based polyester diol in the present embodiment; figure 2 It is the IR spectrogram of the bio-based polyester diol obtained in this example.

Embodiment 2

[0043] The preparation method of bio-based polyester diol A2 is as follows:

[0044] 38.75g of L-lactide, 7.67g of ε-caprolactone and 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro Add 3.0 g of cyclo[5,5]undecane into the reaction kettle, add 0.15 g of stannous octoate as the second catalyst, raise the temperature to 120°C under the protection of an inert gas, react for 20 hours, and then cool to room temperature to obtain a solid product, which is Bio-based polyester diol A2.

Embodiment 3

[0046] The preparation method of bio-based polyester diol A3 is as follows:

[0047] 9.69g of L-lactide, 30.69g of ε-caprolactone and 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro Add 3.0 g of cyclo[5,5]undecane into the reaction kettle, add 0.15 g of stannous octoate as the second catalyst, raise the temperature to 120°C under the protection of an inert gas, react for 20 hours, and then cool to room temperature to obtain a solid product, which is Bio-based polyester diol A3.

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

No PUM Login to View More

Abstract

The invention discloses a bio-based reactive polyurethane hot melt adhesive and a preparation method thereof. The bio-based reactive polyurethane hot melt adhesive comprises the following components in parts by weight: 40-80 parts of bio-based polyester glycol; 15 to 35 parts of polyether polyol; 10 to 25 parts of polyisocyanate; 0.1 to 2 parts of an antioxidant; 0.1-2 parts of a first catalyst; 0-35 parts of thermoplastic resin; 0-5 parts of a silane coupling agent; and 0-10 parts of an auxiliary agent; the bio-based polyester glycol is polyester glycol with the number-average molecular weight of 1500-5000, which is synthesized by using micromolecular diol as an initiator and carrying out random copolymerization on lactide and caprolactone under the action of a second catalyst. According to the present invention, the bio-based raw material is adopted to prepare the polyester glycol, and the polyester glycol is applied to the reaction type polyurethane hot melt adhesive, such that the high-performance environment-friendly adhesive can be green and environmentally friendly, and the advantages of good mechanical property, good bonding strength, excellent heat resistance and the like can be ensured.

Description

technical field [0001] The invention relates to the field of polyurethane hot-melt adhesives, in particular to a bio-based reactive polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] Reactive polyurethane (PUR) hot melt adhesive does not contain water and solvents, and has a solid content of 100%. It is a high-performance and environmentally friendly adhesive. It has the characteristics of ordinary hot-melt adhesives such as solvent-free, high initial viscosity, and rapid positioning during assembly, and has the performance of high bonding strength of reactive liquid adhesives, but the gluing temperature is lower than ordinary hot-melt adhesives. Favored by the automated assembly industry. As the main component of PUR hot melt adhesive, polyester polyol has a very important influence on its adhesive performance and mechanical properties. alcohol. For example, the modified polyester polyol and reactive polyurethane hot melt adhes...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/42C08G18/48C08G63/08
CPCC09J175/06C09J175/08C08G18/4018C08G18/4202C08G18/4277C08G18/428C08G18/48C08G63/08
Inventor 曹阳林鸿腾李帅
Owner XIAMEN WELDTONE TECH CO LTD
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