Water-soluble degradable biomass hyperbranched citric acid polyester adhesive and application

A technology of citric acid and adhesives, applied in the direction of adhesives, etc., can solve the problems of short storage period, poor water resistance, and organic solvent residual production costs, and achieve the effects of non-toxic, low cost, and short preparation cycle

Pending Publication Date: 2022-05-20
天津元汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defects of poor water resistance, short storage period, organic solvent residue and high production cost of the existing environmentally friendly adhesives

Method used

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  • Water-soluble degradable biomass hyperbranched citric acid polyester adhesive and application
  • Water-soluble degradable biomass hyperbranched citric acid polyester adhesive and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of hyperbranched citric acid polyester comprises the following steps:

[0033] Take citric acid (0.3mol; 57.6g) and glycerin (0.9mol; 82.9g) in a three-necked flask, under the protection of nitrogen, stir and heat up to 120°C for 2 hours to prepare a prepolymer, and add a catalyst to the prepolymer 0.286g of p-toluenesulfonic acid (that is, 0.2% of the total weight of glycerol citrate). Connect the three-neck flask containing the prepolymer to a vacuum pump, and conduct vacuum polymerization at 120°C for 2 hours to obtain a hyperbranched citric acid polyester with a hydroxyl end group and a branching degree of 85%. Denoted as hyperbranched citrate polyester 1.

[0034] Take citric acid (0.9mol; 172.8g) and glycerin (0.3mol; 27.6g) in a three-necked flask, under the protection of nitrogen, stir and heat up to 120°C for 2 hours to prepare a prepolymer, and add a catalyst to the prepolymer 0.4g p-toluenesulfonic acid (that is, 0.2% of the total weight of ...

Embodiment 2

[0036] The preparation of hyperbranched citric acid polyester adhesive comprises the following steps:

[0037](1) Take 40g hyperbranched citric acid polyester 1 and put it into a three-necked flask. Weigh 10 g of borax and dissolve it in 50 mL of distilled water at 80 °C. After the borax is completely dissolved, slowly add all the borax solution into the heated hyperbranched citric acid polyester, and continue to react for 1 h after all the borax is added.

[0038] (2) Part of the water was removed by rotary evaporation to obtain a hyperbranched citric acid polyester adhesive containing boric acid groups with a water content of 21.4 wt%, which was designated as sample 1.

Embodiment 3

[0040] (1) Take 40g hyperbranched citric acid polyester 1 and put it into a three-necked flask. Weigh 15g of borax and dissolve it in 75mL of distilled water at 80°C. After the borax is completely dissolved, slowly add all the borax solution into the heated hyperbranched citric acid polyester, and continue to react for 1 h after all the borax is added.

[0041] (2) Part of the water was removed by rotary evaporation to obtain a hyperbranched citric acid polyester adhesive containing boric acid groups with a water content of 24 wt%, which was designated as sample 2.

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Abstract

The invention relates to a water-soluble degradable biomass hyperbranched citric acid polyester adhesive. The water-soluble degradable biomass hyperbranched citric acid polyester adhesive consists of hyperbranched citric acid polyester and a doping agent, wherein the molar ratio of the hyperbranched citric acid polyester to the doping agent is (4-40): 1; the terminal group of the hyperbranched citric acid polyester is carboxyl or hydroxyl, and the branching degree is 50-90%. The hyperbranched citric acid polyester adhesive prepared by the invention has good water solubility and biodegradability, and the preparation method is simple, free of organic solvent residue, short in production period, low in cost and capable of being repeatedly used.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a water-soluble degradable biomass hyperbranched citric acid polyester adhesive and its application. Background technique [0002] Currently commercialized adhesives mainly include epoxy resin type, polyurethane type, acrylic type, and silica gel. Due to the long history of research and development and use of adhesives, too much attention has been paid to their functional research, and they are not compatible with large quantities of high-quality adhesives. Compared with molecular materials, the amount of adhesive used is less, resulting in very rare environmentally friendly adhesives on the market. With the rapid deterioration of the global environment and the gradual improvement of social environmental protection awareness, the development of biodegradable adhesives, biomass adhesives based on renewable resources, and water-soluble adhesives that do not use organi...

Claims

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Application Information

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IPC IPC(8): C09J167/00C08G63/91
CPCC09J167/00C08G63/914
Inventor 王德培刘靖窦广鹏
Owner 天津元汇科技有限公司
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