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Aldehyde-free starch adhesive of plywood and method for preparing same

A technology of plywood and aldehyde starch, which is applied in the direction of adhesives, manufacturing tools, adhesive types, etc., can solve the problems that the adhesive force of starch glue cannot meet the standard requirements, plywood cannot be applied, and the bonding strength cannot reach the production environment. Excellent, beneficial to environmental protection, low price effect

Inactive Publication Date: 2009-01-07
郭同虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, starch glue used for wood processing cannot be applied because its water resistance and bonding strength do not meet the requirements of the national standard for plywood.
People in the industry have carried out various studies on improving the adhesive properties of starch, but the current results are that either the adhesive force of starch adhesives still does not meet the standard requirements, or the process used is extremely cumbersome, or additives such as formaldehyde are still required for improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, take 100 parts by weight of starch, 150 parts of water, 0.4 parts of sodium hydroxide, 1 part of sodium periodate, 0.5 parts of ammonium persulfate, and 8 parts of acrylamide. Add 100 parts of cornstarch to 150 parts of water, stir and prepare starch suspension turbidity, add 0.4 part of solution sodium hydroxide, adjust the pH value to 5-6, add 1 part of solution sodium periodate after 10 minutes, Keep the temperature at 35°C, oxidize for 3.5 hours, then add 0.5 parts of ammonium persulfate solution in three batches, then add 8 parts of acrylamide solution, raise the temperature to 70°C, react for 1 hour, add 0.5 parts of antifungal agent, When the temperature is lowered to room temperature, the final grafting process is completed, and the starch glue product is obtained, which can be used for pressing poplar plywood.

Embodiment 2

[0023] Example 2, take 100 parts by weight of starch, 200 parts of water, 1.2 parts of sodium hydroxide, 1 part of sodium hypochlorite, 1 part of potassium persulfate, and 20 parts of acrylamide.

[0024] Add 100 parts of cornstarch to 200 parts of water, stir to make a starch suspension, add 1.2 parts of sodium hydroxide in solution, adjust the pH value to 8-9, add 3 parts of sodium hypochlorite in solution after 20 minutes, and keep the temperature at 45 ℃, oxidation reaction for 4 hours, then add a total of 1 part of potassium persulfate solution in three batches for initiation, then add 20 parts of acrylamide solution, heat up to 80 °C, react for 1.5 hours, add 0.2 parts of antifungal agent, cool down To 3 room temperature, just complete the last grafting process, get starch glue finished product, can be used for the pressing of poplar plywood.

Embodiment 3

[0025] Example 3: Take 100 parts by weight of starch, 180 parts by weight of water, 0.8 parts by weight of sodium hydroxide, 0.8 parts by potassium permanganate, 3 parts by weight of sulfuric acid, 0.8 parts by weight of potassium persulfate, and 15 parts by weight of acrylamide.

[0026] Add 100 parts of cornstarch to 200 parts of water, stir and prepare starch suspension turbidity, add 1.2 parts of solution-like sodium hydroxide, adjust the pH value to 9, add 2 parts of solution-like potassium permanganate after 20 minutes, and keep the temperature React at 45°C for 4 hours to complete the first oxidation reaction, then add sulfuric acid and stir the starch solution to milky white to complete the second oxidation reaction. Then add a total of 0.8 parts of potassium persulfate solution in three batches for initiation, add 15 parts of acrylamide solution, heat up to 75°C, react for 1.2 hours, add 0.3 parts of antifungal agent, cool to room temperature to complete the final graf...

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PUM

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Abstract

The invention provides a glued board aldehydeless starch gum and a preparation method. The starch gum of the invention is made of the material components with the weight portions of 100 portions of starch, 0.4-1.2 portions of alkali, 1-3 portions of oxidant, 0.5-1 portions of initiator, 8-20 portions of grafting agent and 0.2-0.5 portions of preservative. In the preparation method, starch suspension liquid is obtained; alkali is added for activating the suspension liquid; pH value is adjusted; oxidizer is selected for oxidizing the activated starch suspension liquid; the initiator is introduced; polymer monomeric compound is adopted for grafting. The product of the invention has the advantages of nontoxic and harmless performance, low price, biodegradable performance and environmental protection. With good adhesion property, the glued board aldehydeless starch gum is especially applied to press poplar glued boards and laminated veneer lumbers. The adhesion strength accords with the national standard requirement. Belonging to the aldehydeless environmental protection adhesive, the glued board aldehydeless starch gum can play a positive role in promoting the industrialized and development of abundant poplar fast growing areas (such as northern Jiangsu).

Description

technical field [0001] The invention relates to an adhesive glue and a preparation method thereof, in particular to a plywood formaldehyde-free starch glue and a preparation method thereof. Background technique [0002] Plywood is widely used in the building decoration industry, and is also used in furniture production, home appliances, and food packaging. For a long period of time in the past, formaldehyde series adhesives were mostly used in the production of plywood. This type of adhesive has the advantages of good wettability and strong adhesion, but it will release toxic gases such as free formaldehyde during production and use, which is harmful to the human body. health, causing environmental pollution. Therefore, the development of environmentally friendly formaldehyde-free glue has become an inevitable trend. The natural polymer starch glue currently on the market is non-toxic and harmless, biodegradable, and is an environmentally friendly natural renewable resourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02B27D1/04
Inventor 张立芳
Owner 郭同虎
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