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Method for preparing modified environment-friendly corn starch adhesive

A technology of corn starch and adhesives, applied in the direction of starch adhesives, adhesive types, unsaturated alcohol copolymer adhesives, etc., can solve the problems of weak adhesion and poor water resistance, and achieve adhesive performance Strong, short curing time, the effect of improving the cross-linking effect

Active Publication Date: 2019-10-29
广东茂丰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesives prepared by the existing technology still have problems such as weak adhesion and poor water resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A modified environment-friendly corn starch adhesive, comprising the following components by weight: 30 parts of corn starch, 360 parts of water, 0.4 parts of potassium permanganate, 100 parts of polyvinyl alcohol, 3 parts of modified boric acid crosslinking agent, 4 parts of calcium chloride, 0.8 part of urea, 0.3 part of Q-119 type silicone defoamer, appropriate amount of sodium hydroxide (adjust pH value);

[0021] The preparation method of described modified environment-friendly cornstarch adhesive comprises the steps:

[0022] (1) Boric acid crosslinking agent modification: mix 100g of water, 25g of boric acid, 3g of epichlorohydrin and 1g of citric acid according to the mass ratio, add sodium hydroxide to adjust the pH value to 8-10, and heat up to 90°C for reaction After 60 minutes, after the reaction was completed, 20 mL of ethanol was added, stirring was continued for 15 minutes, and the modified boric acid crosslinking agent was obtained by filtering and dryin...

Embodiment 2

[0025] A modified environment-friendly cornstarch adhesive, comprising the following parts by weight: 30 parts of cornstarch, 360 parts of water, 1 part of potassium permanganate, 100 parts of polyvinyl alcohol, 3 parts of modified boric acid crosslinking agent, 4 parts of calcium chloride, 0.8 part of urea, 0.3 part of Y-610 type silicone defoamer, appropriate amount of sodium hydroxide (adjust pH value);

[0026] The preparation method of described modified environment-friendly cornstarch adhesive comprises the steps:

[0027] (1) Boric acid crosslinking agent modification: mix 100g of water, 21g of boric acid, 3g of epichlorohydrin and 0.8g of citric acid according to the mass ratio, add sodium hydroxide to adjust the pH value to 8-10, and heat up to 90°C React for 60 minutes. After the reaction is completed, add 15 mL of ethanol, continue to stir for 25 minutes, and filter and dry to obtain a modified boric acid crosslinking agent.

[0028] (2) Add 350g of water to the th...

Embodiment 3

[0030] A modified environment-friendly corn starch adhesive, comprising the following components by weight: 30 parts of corn starch, 380 parts of water, 0.6 parts of potassium permanganate, 110 parts of polyvinyl alcohol, 4 parts of modified boric acid crosslinking agent, 4 parts of calcium chloride, 2 parts of urea, 0.3 part of Y-610 type silicone defoamer, appropriate amount of sodium hydroxide (adjust pH value);

[0031] The preparation method of described modified environment-friendly cornstarch adhesive comprises the steps:

[0032] (1) Boric acid crosslinking agent modification: mix 100g of water, 28g of boric acid, 3g of epichlorohydrin and 1g of citric acid according to the mass ratio, add sodium hydroxide to adjust the pH value to 8-10, and heat up to 90°C for reaction After 60 minutes, after the reaction was completed, 15 mL of ethanol was added, stirring was continued for 25 minutes, and the modified boric acid crosslinking agent was obtained by filtering and drying...

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Abstract

The invention relates to a modified environment-friendly corn starch adhesive. The corn starch adhesive is prepared from the following components in parts by weight: 30 parts of corn starch, 300 to 400 parts of water , 0.2 to 3 of oxidizing agent, 80 to 120 parts of polyvinyl alcohol, 1 to 5 parts of crosslinker, 3 to 5 parts of calcium chloride, 0.1 to 3 parts of urea,0.2 to 0.5 part of a defoaming agent, and a defined amount of sodium hydroxide (to adjust the pH value); the corn starch adhesive is characterized in that the crosslinker is a modifiedboric acid crosslinker and prepared from boric acid, epichlorohydrin, water, and citric acid at 80 DEG C to 100 DEG C; the surface of the modified boric acid crosslinker is bonded with a large number of epoxy groups and carboxyl groups which are capable of reacting with the carboxyl groups and the aldehyde groups inoxidized starch, and the reactions form a synergistic effect with the boric acid, thus the bonding efficiency is improved together, and the bonding strength of colloids is improved; the moisture resistance of acolloid film is greatly improved due to the interaction of the multiple groups; andthe adhesive strength of the prepared adhesive meets the corrugated board adhesive export standard.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a cornstarch adhesive for cartons. Background technique [0002] my country produces a huge amount of corrugated paper every year, and the annual output has reached nearly 100 billion cubic meters. If per production 1M 3 Calculated by consuming 90-120g of adhesive, the annual consumption of adhesive is nearly 10 million tons. my country has strictly restricted the use of natron in the production of corrugated paper. At present, most carton factories use adhesives made of corn starch. Corn starch adhesive is a kind of adhesive with good performance, non-toxicity and low price. Since it came out in the United States in 1935, it has been paid more and more attention by people, especially in the contemporary environment where the environmental crisis is becoming more and more serious. However, most carton factories are single-machine production, lack of drying equipment, rely en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J129/04C09J103/02C09J11/04C09J11/06
CPCC09J129/04C09J11/04C09J11/06C08K2003/162C08L3/02C08K13/06C08K9/04C08K3/38C08K3/16C08K5/21C08K5/1515C08L3/10C08L63/00C08J3/24C08J2303/02C08J2329/04C08K5/092C09J103/02
Inventor 不公告发明人
Owner 广东茂丰科技有限公司
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