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Polyester polyol for polyurethane hot melt adhesive as well as preparation method and application of polyester polyol

A polyurethane hot-melt adhesive and polyester polyol technology, which is applied in the field of polyester polyol, can solve the problems of complex process route, long positioning time, and low initial bonding strength, so as to improve production efficiency, increase crystallinity, and enhance cohesion Effect

Active Publication Date: 2021-05-04
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since moisture-curing polyurethane hot-melt adhesives are usually oligomers, their initial bonding strength is usually low and the positioning time is long, which leads to the fact that moisture-curing polyurethane hot-melt adhesives are not suitable for the initial bonding strength in woodworking cladding, woodworking edge banding, etc. Applications in demanding scenarios are restricted, which is also a pain point in the industry that restricts the expansion of moisture-curing polyurethane hot-melt adhesive terminal applications
Patent CN109611043 has designed a moisture-curable adhesive that can be cured by ultraviolet light. Modified isocyanate is prepared by reacting hydroxyalkyl acrylate with excess isocyanate, and then mixed with diluent and initiator; the synthesis step is divided into two steps, and the synthesis When modifying isocyanate, it is necessary to add isocyanate drop by drop, the process route is complicated, and the acrylate components in hydroxyalkyl acrylate and diluent are toxic

Method used

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  • Polyester polyol for polyurethane hot melt adhesive as well as preparation method and application of polyester polyol
  • Polyester polyol for polyurethane hot melt adhesive as well as preparation method and application of polyester polyol
  • Polyester polyol for polyurethane hot melt adhesive as well as preparation method and application of polyester polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0060] Prepare the polyester polyol A-J that is used to prepare polyurethane hot-melt adhesive, and step is:

[0061] Under the condition of nitrogen protection, component A), component B) and component C), and tetraisopropyl titanate catalyst, polymerization inhibitor hypophosphorous acid were sequentially added into the 5L reactor, and the ratio of raw materials was shown in Table 1. ;The system temperature was raised to 140~160°C, and kept at this temperature (Example 1-8: 150°C, Example 9: 140°C, Example 10: 160°C) for 1.0h; Internally rise to 180-210°C (Example 1-8: 210°C, Example 9: 200°C, Example 10: 180°C), and monitor the acid value and hydroxyl value, and open when the acid value is lower than 20mgKOH / g Vacuum system, the vacuum degree is slowly reduced to -0.095MPa within 0.5h, and the vacuum degree is controlled at 0.09-0.095Mpa to remove moisture and small molecule alcohol in the system. When the acid value and hydroxyl value reach the standard, stop the vacuum an...

Embodiment 11-20

[0074] Synthesis of Polyurethane Hot Melt Adhesive

[0075] Under the protection of nitrogen, add the polyester polyols A-J and isocyanate prepared in Preparation Examples 1-10 into a 2L three-necked round-bottomed flask, stir and react until the NCO content reaches the theoretical value, stop the experiment, vacuum defoam, and the obtained hot melt adhesive It was kept at a constant temperature at 130°C for standby, and the ratio of raw materials and reaction conditions were shown in Table 3.

[0076] The evaluation data of the polyurethane hot melt adhesive after curing is shown in Table 4 below.

[0077] Table 3 embodiment 11-20 raw material ratio and reaction conditions

[0078]

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Abstract

The invention provides polyester polyol for a polyurethane hot melt adhesive as well as a preparation method and application of the polyester polyol. The polyol is prepared from the following three components: dicarboxylic acid or anhydride containing unsaturated bonds without polymerization reaction activity, dicarboxylic acid or anhydride containing unsaturated double bonds or triple bonds with polymerization reaction activity, and dihydric alcohol. The carboxylic acid monomer with a rigid cyclic structure is introduced into the raw materials, so that the initial adhesion strength of the hot melt adhesive can be remarkably improved, and the positioning time of the hot melt adhesive is shortened.

Description

technical field [0001] The invention relates to the field of polyester polyols, in particular to polyester polyols for preparing moisture-curing polyurethane hot-melt adhesives, a preparation method and applications thereof. Background technique [0002] Moisture-curing polyurethane hot-melt adhesive is a solvent-free, environmentally friendly hot-melt adhesive with excellent properties such as low operating temperature, wide range of substrates, solvent resistance and creep resistance. It is widely used in textiles, woodworking, electronics, automobiles and white Home appliances and other fields. With the increasingly stringent environmental protection policies, the application prospects of moisture-curing polyurethane hot melt adhesives are broader. [0003] Moisture-curing polyurethane hot-melt adhesives are prepared by the reaction of polyols and isocyanates. They have free isocyanate functional groups. Chemical crosslinking occurs through the reaction of isocyanate fun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/40C08G63/553C08G63/85C09J175/06
CPCC08G63/40C08G63/553C08G63/85C09J175/06Y02E10/50
Inventor 孙令民张存玉黄岐善
Owner WANHUA CHEM GRP CO LTD
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