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Environmentally friendly adhesive for citric acid-based plywood with ultra-high solid content, preparation method and application thereof

An ultra-high solid content, plywood technology, applied in the directions of non-polymer adhesive additives, adhesives, adhesive types, etc., can solve the problems of inability to develop plywood preparation, low solid content of adhesives, inconvenient use, etc. Achieve the effect of improving thermal curing rate and bonding strength

Active Publication Date: 2021-09-07
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Synthetic resin adhesives are usually prepared with petroleum extracts as the main raw material, which will release volatile organic compounds during use and cause environmental pollution; at the same time, considering the gradual scarcity of petroleum resources, the development and application of renewable resources as Environmentally friendly adhesives as the main raw materials have become a key problem in the wood adhesive industry; traditional natural adhesives for plywood are mostly modified with soybean protein isolate or starch, and the adhesive has a low solid content. And the viscosity is high, the application process has high requirements on the flatness of the material, and the viscosity needs to be adjusted, etc., which is inconvenient to use. Therefore, the development of natural adhesives with ultra-high solid content and low viscosity is an important reality for expanding the application of natural rubber. significance
The traditional citric acid-based adhesive is mixed with sucrose, and the viscosity of the prepared adhesive is too low. Particleboard can only be prepared by spraying, and plywood cannot be prepared. Therefore, the development of a new citric acid-based adhesive Agents can expand the application field of citric acid-sucrose bonding system

Method used

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  • Environmentally friendly adhesive for citric acid-based plywood with ultra-high solid content, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An ultra high solid content with green plywood adhesive, its composition ratio by weight of the following component composition:

[0030] 100 parts of citric acid;

[0031] 30 parts of sucrose;

[0032] 5 parts of cupric chloride;

[0033] 5 copulation of calcium oxide;

[0034] 10 parts of absolute ethanol;

[0035] 15 parts water;

[0036] Preparation of adhesive:

[0037] Parts by weight of the components weighed corresponding starting materials, the preparation of the adhesive, first mixed sucrose, copper chloride and water, the reaction was stirred at low speed 70 ℃ 1.5 hours and then citric acid was added to the reaction system at 90 deg.] C the reaction stirred at low speed for 3 hours after ethanol was added to the reaction system, high-speed stirring for 1 hour after warming device off at 80 ℃, after the temperature of the reaction system be cooled to room temperature, calcium oxide was added to the solution, stirred at low speed 0.5 Hour.

[0038] The prepared adh...

Embodiment 2

[0043] An ultra high solid content with green plywood adhesive, its composition ratio by weight of the following component composition:

[0044] 100 parts of citric acid;

[0045] 25 parts of sucrose;

[0046] 3 parts of copper chloride;

[0047] 2 parts of calcium oxide;

[0048] 15 parts of absolute ethanol;

[0049] 28 parts water;

[0050] Preparation of adhesive:

[0051] Parts by weight of the components weighed corresponding starting materials, the preparation of the adhesive, first mixed sucrose, copper chloride and water, the reaction was stirred at low speed 75 ℃ 1.2 hours and then citric acid was added to the reaction system at 95 deg.] C low reaction stirred for 2 hours, after addition of ethanol to the reaction system, high-speed stirring 0.8 hours the reaction was warmed closing means 85 ℃, after the temperature of the reaction system be cooled to room temperature, calcium oxide was added to the solution, stirred at low speed 0.4 Hour.

[0052] The prepared adhesive ...

Embodiment 3

[0057] An ultra high solid content with green plywood adhesive, its composition ratio by weight of the following component composition:

[0058] Plywood ultrahigh solid content with green adhesive having a composition comprising the following ingredients in weight percent:

[0059] 100 parts of citric acid;

[0060] 28 parts sugar;

[0061] 4 parts of copper chloride;

[0062] 3 parts of calcium oxide;

[0063] 13 parts of absolute ethanol;

[0064] 22 parts water;

[0065] Preparation of adhesive:

[0066] Parts by weight of the components weighed corresponding starting materials, the preparation of the adhesive, first mixed sucrose, copper chloride and water, the reaction was stirred at low speed 80 ℃ 1 hour and then citric acid was added to the reaction system at 100 ℃ for low speed for 1 hour, after addition of ethanol to the reaction system, a high speed stirring for 0.5 hours the reaction was warmed closing means 90 ℃, after the temperature of the reaction system be cooled t...

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Abstract

The invention discloses an environmentally friendly adhesive for citric acid-based plywood with ultra-high solid content, and its components include the following components by weight percentage: 100 parts of citric acid, 25-30 parts of sucrose, 3-5 parts of copper chloride, 2-5 parts of calcium oxide, 10-15 parts of absolute ethanol, and 15-28 parts of water; the solid content of the environmental-friendly adhesive for plywood is 75.1-84.8%, and the viscosity range is 277-537 mPa·s. It also discloses its preparation method, its application in the preparation of plywood, and the prepared plywood. The adhesive provided by the present invention uses citric acid to catalyze the hydrolysis and conversion of sucrose to form a low-molecular-weight prepolymer. The viscosity of the adhesive is moderate, and the solid content can reach 75.1-84.8%, which improves the natural rubber used in traditional plywood. Due to the defect that the solid content of the adhesive cannot be increased due to too high viscosity, the present invention simultaneously uses an aqueous ethanol solution to adjust the viscosity of the adhesive to reduce the moisture content, improve the thermal curing efficiency, and reduce the thermal curing temperature.

Description

Technical field [0001] The present invention relates to a high solid content environmentally-friendly citrate-based plywood adhesive, preparation method and application. Background technique [0002] Adhesive synthetic resins generally petroleum extract as the main raw material be prepared using the process will release the volatile organics, pollute the environment; Meanwhile, considering the increasingly scarce petroleum resources, and the development of renewable resources is applied environment-friendly adhesive the main raw material, wood has become a key issue to be resolved in the adhesives industry; conventional plywood adhesives to use more natural modified soy protein isolate or modified starches, low solid content of the adhesive and viscosity, there is a high flatness requirements on the material, and problems such as the need to adjust the viscosity, inconvenient to use, so the development of high solid content and low viscosity natural adhesive application process, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J105/00C09J11/06B27D1/08B27D1/04
CPCB27D1/04B27D1/08C09J11/06C09J105/00
Inventor 赵中元孙世静
Owner NANJING FORESTRY UNIV
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