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Preparation method for environment-friendly starch-based binder

An adhesive and starch-based technology, which is applied in the direction of starch-derived adhesives, adhesive types, protein adhesives, etc., can solve the problems of intolerant to bacteria and insects, water resistance, etc., to ensure the bonding strength and improve Water resistance, cost saving effect

Inactive Publication Date: 2012-03-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this type of glue is that most of them are not resistant to water, and are not resistant to corrosion by bacteria and insects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use sodium periodate as the oxidant and waxy corn starch as the raw material, the molar ratio of the two is 0.2:1, adjust the pH of the solution to 2.0 with 0.1N HCL after mixing, react in water at 20°C for 3 hours, and the reaction ends Afterwards, wash with distilled water and acetone respectively, dry and pulverize to obtain oxidized starch, and its aldehyde group content is 20% according to the acid-base titration method.

[0032] Take 0.2kg of soybean protein isolate, add 1.8L of distilled water to mix, and stir evenly on a stirrer. Use 0.2N NaOH solution to adjust the pH to 8, and then put it in a 40°C water bath for 2 hours to obtain a modified protein test solution.

[0033] Take 0.2 kg of polyvinyl alcohol, add 3.8 L of distilled water, stir evenly, dissolve in a boiling water bath for 20 minutes, and obtain a polyvinyl alcohol solution.

[0034] Take 1 kg of the above-mentioned oxidized starch, and 2 kg of the modified test solution of soybean protein isolate ...

Embodiment 2

[0044] Use sodium periodate as the oxidant and potato starch as the raw material. The molar ratio of the two is 0.4:1. After mixing, use 0.1N HCL to adjust the pH of the solution to 3.0, and react in water at 30°C for 3 hours. After the reaction, use Distilled water and acetone are washed separately, dried and then powdered to obtain oxidized starch. According to the acid-base titration method, the aldehyde content is 40%.

[0045] Take 0.3g of soybean protein isolate, add 3.7L of distilled water to mix and stir evenly on a stirrer, use 0.2N NaOH solution to adjust the pH to 9, then put it in a 50°C water bath for 1.5h, and obtain a modified protein test solution after the end .

[0046] Take 0.3 kg of polyvinyl alcohol, add 3.7 L of distilled water, stir evenly, dissolve in a boiling water bath for 30 minutes, and then obtain a polyvinyl alcohol solution.

[0047] About 1.2kg of oxidized starch, 2kg of the above-mentioned modified protein test solution, mix the two evenly, a...

Embodiment 3

[0055] Use sodium periodate as the oxidant and rice starch as the raw material. The molar ratio of the two is 0.6:1. After mixing, use 0.1N HCL to adjust the pH of the solution to 4.0, and react in water at 30°C for 4 hours. After the reaction, use Distilled water and acetone are washed separately, and after drying, the oxidized starch can be obtained by powdering. According to the acid-base titration method, the aldehyde content is 50%.

[0056] Take 0.4g of soybean protein isolate, add 4.6L of distilled water to mix and stir evenly on a stirrer, use 0.2N NaOH solution to adjust the pH to 10, and then put it in a 60°C water bath for 1 hour to obtain a modified protein test solution.

[0057] Take 0.6 kg of polyvinyl alcohol, add 3.4 L of distilled water, stir evenly, dissolve in a boiling water bath for 40 minutes, and then obtain a polyvinyl alcohol solution.

[0058] About 1.2kg of oxidized starch, 2kg of the above-mentioned protein isolate test solution, and then mix the t...

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Abstract

The invention discloses a preparation method for an environment-friendly starch-based binder. According to the method, oxidized starch and modified protein are mixed according to a mass ratio of 2:1 to 5:1; polyvinyl alcohol is added according to a mass ratio of oxidized starch to polyvinyl alcohol of 2:1 to 5:1 and uniformly mixed with oxidized starch and modified protein, and an obtained mixture is subjected to a reaction for 2 to 5 hours at a temperature of 50 to 80 DEG C; first liquid of the binder is prepared; the first liquid of the binder is taken out, an auxiliary agent is added, and the environment-friendly starch-based binder is prepared by uniformly mixing the first liquid of the binder and the auxiliary agent; the auxiliary agent is borax and / or citric acid, and the amount of the auxiliary agent accounts for 2 to 5% of the amount of dry starch base. The oxidation starch is prepared by using sodium periodate as an oxidizing agent and mixing the oxidizing agent with starch at a temperature of 20 to 50 DEG C; the raw material in the invention, starch, undergoes a chemical reaction with protein and produces firm chemical bonds, which enables a net structure of the binder to be formed; the net structure and the action of cross-linking agents allow the binder to have improved stability and enhanced water resistance; the invention enables cost to be saved and the goal of environmental protection to be realized.

Description

technical field [0001] The invention relates to an adhesive, in particular to a preparation method of an environment-friendly starch-based adhesive, which can be used for wood bonding. Background technique [0002] A new type of adhesive based on synthetic polymers—synthetic polymer adhesives. The most widely used and most representative formaldehyde-based adhesives include urea-formaldehyde resin adhesives, phenolic resin adhesives, and melamine. Among them, urea-formaldehyde resin is used in the largest amount, accounting for about 80% of the amount of formaldehyde-based adhesives and 60% of the total consumption of wood adhesives. This type of adhesive has developed rapidly due to its small molecular weight, good wettability, and high bonding strength, and soon replaced natural adhesives and occupied the wood adhesive market. In addition to formaldehyde-based adhesives, other water-based adhesives are widely used in wood adhesives, such as polyvinyl acetate emulsion, acr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J189/00C09J129/04C08B31/18
Inventor 高群玉胡磊
Owner SOUTH CHINA UNIV OF TECH
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