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Tackifying additive and application thereof in woodworking glue

A technology of additives and end-capping agents, which is used in the field of tackifying additives and its application in woodworking glue, which can solve the problems of yellowish color, difficulty in dissolving, and looseness of adhesives, and improve positioning speed and initial adhesion. , The preparation method is simple, the effect of good storage stability

Active Publication Date: 2020-12-29
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing tackifying resins are generally phenolic resins, rosin resins, etc. After adding the solvent adhesive system, the color of the adhesive will generally be seriously yellowed, which affects the normal use of the adhesive. In addition, phenolic resins and other general molecular weights are high, and some have active hydroxyl groups, which will affect the solubility of the colloidal particles and the storage stability of the later use with the curing agent. Some researchers use crystalline polymers Added as a tackifier, on the one hand, it is easy to cause difficulty in dissolving the glue during the preparation process; on the other hand, it will cause bubbles in the glue layer and weak bonding due to the influence of the crystallization of the solvent after sizing.

Method used

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  • Tackifying additive and application thereof in woodworking glue
  • Tackifying additive and application thereof in woodworking glue

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preparation example Construction

[0033] In one embodiment of the present invention, the present invention provides a preparation method of the above-mentioned thickening additive, and its preparation method is as follows: use aromatic dibasic acid, aliphatic dibasic acid, linear small molecule dibasic alcohol, alicyclic It is prepared by reacting catalyzed by inorganic acid esters and 4-dimethylaminopyridine composite catalysts using family dihydric alcohols and aromatic dihydric alcohols as raw materials.

[0034] In a specific embodiment, the preparation method is:

[0035] Weigh aromatic dibasic acids, fatty acid dibasic acids, aliphatic dibasic alcohols, alicyclic dibasic alcohols and aromatic dibasic alcohols in a certain proportion and add them into the reactor, and raise the temperature to 200-230°C under the protection of nitrogen to react 4- 6h, add inorganic acid esters and 4-dimethylaminopyridine composite catalyst catalyst, and then react under reduced pressure to remove the low-boiling reaction f...

Embodiment 1

[0046] Prepare the tackifying additive as follows:

[0047] Weigh 830.65g of terephthalic acid, 1038.31g of isophthalic acid, 182.7g of adipic acid, 315.42g of 1,4-butanediol, 793.1g of 1,4-cyclohexanedimethanol and 138.16g of terephthalic acid Put it into the reactor, raise the temperature to 180°C under the protection of nitrogen, react at constant temperature for 2h, then raise the temperature to 220°C for 5h, add catalyst isopropyl zirconate 0.18g and 4-dimethylaminopyridine 0.02g, catalyze the reaction for 1h, then pump Vacuum to -0.095Mpa to react under reduced pressure to remove the low-boiling reaction for 4 hours, and obtain a carboxyl-terminated intermediate product with a test acid value of 37.4 mg KOH / g, add 514.71 g of n-octadecyl alcohol as a capping agent, and react at 220 ° C for 4 hours , track the acid value of the system, if the acid value is less than 0.05mg KOH / g, vacuumize and depressurize the reaction for 2 hours. Cool down to 140°C and pour the obtained...

Embodiment 2

[0049] Prepare the tackifying additive as follows:

[0050] Weigh 770.84g of terephthalic acid, 965.22g of isophthalic acid, 80.39g of adipic acid, 114.15g of 1,3-propanediol, 1009.4g of 1,4-cyclohexanedimethanol and hydroquinone bishydroxyethyl Add 297.3g of ether into the reactor, raise the temperature to 180°C under the protection of nitrogen, react at constant temperature for 2h, then raise the temperature to 225°C for 4h, add catalyst tetraisopropyl titanate 0.21g and 4-dimethylaminopyridine 0.05g, catalyze the reaction 1.5h, then evacuate to -0.095Mpa depressurization reaction to remove the low boiling reaction for 5h, obtain the intermediate product end-capped by carboxyl group, test acid value is 23.67mg KOH / g, add blocking agent isooctyl alcohol 156.11g, at 225 React at ℃ for 4 hours, track the acid value of the system, if the acid value is less than 0.05mg KOH / g, then vacuumize and decompress and react for 2 hours. Cool down to 140℃ and pour the obtained material int...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to a tackifying additive and application thereof in woodworking glue. The tackifying additive is formed by copolymerization of binary acid, dihydric alcohol and an end-capping reagent, the glass transition temperature of the tackifying additive ranges from 35 DEG C to 55 DEG C, and the molecular weight of the tackifying additive ranges from 3000g / mol to 7000g / mol; the binary acid is composed of aromatic binary acid and aliphatic binary acid; the dihydric alcohol is composed of straight-chain micromolecular dihydric alcohol, alicyclic dihydric alcohol and aromatic dihydric alcohol; and the molar ratio of the binary acid to the dihydric alcohol is 1.1-1.3: 1, and the molar ratio of the end-capping reagent to the binary acid is 0.06-0.2: 1. The tackifying additive is prepared by taking long-chain binary acid, dihydric alcohol and the end-capping reagent as raw materials and reacting under the catalysis of an inorganic acid ester and 4-dimethylaminopyridine composite catalyst. The tackifying additive is added into an adhesive system, so that dissolution of colloidal particles is not affected, the initial adhesion of the colloidal particles is improved, the color of the adhesive is not affected, and the effective storage period of the adhesive can be prolonged due to the fact that the tackifying additive does not have a reaction group in the process of being matched with a curing agent for use.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a viscosity-increasing additive and its application in woodworking glue. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Polyurethane adhesives can be used in the field of woodworking adhesives because of their excellent bonding properties. In the field of furniture and home decoration, polyurethane solvent adhesives are used as woodworking adhesives. However, the initial adhesion of polyurethane solvent adhesives is average. To ensure good use effects, generally Need to add tackifying resin. The existing tackifying resins are generally phenolic resins, rosin resins...

Claims

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Application Information

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IPC IPC(8): C08G63/199C08G63/672C08G63/91C09J175/04C09J11/08
CPCC08G63/199C08G63/916C08G63/672C09J175/04C09J11/08C08L67/02
Inventor 刘德富宋红玮傅恺凡王仁鸿高玉宝
Owner MIRACLL CHEM
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