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Starch-PVA (Polyvinyl Alcohol)-chitosan blended film and method for preparing plywood through hot-pressing

A chitosan and blended film technology, applied in starch adhesives, chitin adhesives, film/sheet-like adhesives, etc., can solve the problem of non-biodegradation, softening and deformation of the adhesive layer, and decreased bonding strength and other problems, to achieve the effect of simple method, good compatibility and good biodegradability

Inactive Publication Date: 2019-04-26
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (CN 203807377U) discloses a thermoplastic film structure for hot-pressed plywood. The film used is a thermoplastic petroleum-based material that cannot be biodegraded
Moreover, when the thermoplastic adhesive film is cooled and solidified and then heated or the ambient temperature rises, the adhesive layer will soften and deform, resulting in a sharp drop in bonding strength.

Method used

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  • Starch-PVA (Polyvinyl Alcohol)-chitosan blended film and method for preparing plywood through hot-pressing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Weigh the starch and put it in the reaction kettle, add water of equal quality, stir continuously and raise the temperature to 40°C, adjust the pH=11, add sodium hypochlorite solution (available chlorine 10%), stir for 3.5h, then add sodium sulfite, stir 10min, then add a PVA solution with a concentration of 10% and stir for 20min, then add a chitosan solution with a concentration of 5% and stir for 1h, heat up to 75°C and gelatinize into a gel to obtain a starch-PVA-chitosan adhesive; wherein, The amount of sodium hypochlorite solution (10% available chlorine) added is 8% of the dry weight of the starch, the amount of sodium sulfite added is 2% of the sodium hypochlorite solution (10% available chlorine), and the amount of PVA (dry weight) added is 20% of the dry weight of the starch. The amount of chitosan (dry weight) added is 50% of the dry weight of starch;

[0040] (2) Degas the obtained starch-PVA-chitosan adhesive under the condition of vacuum degree of 0.1 ...

Embodiment 2

[0044] (1) Weigh the starch and put it in the reaction kettle, add water of equal quality, stir continuously and raise the temperature to 50°C, adjust the pH=10, add potassium permanganate, stir for 45min, then add sodium sulfide, stir for 10min, then add Stir the PVA solution with a concentration of 10% for 30 minutes, then add a chitosan solution with a concentration of 5% and stir for 0.5 hours, heat up to 68°C and gelatinize to form a starch-PVA-chitosan adhesive; among them, permanganate The addition of potassium is 3% of the dry weight of starch, the addition of sodium sulfide is 5% of the dry weight of potassium permanganate, the addition of PVA (dry weight) is 5% of the dry weight of starch, and the addition of chitosan (dry weight) The amount is 30% of the dry weight of starch;

[0045] (2) The obtained starch-PVA-chitosan adhesive was degassed under the condition of vacuum degree of 0.9MPa, scraped on a chrome-plated steel plate to form a film, and dried at a constan...

Embodiment 3

[0049] (1) Weigh the starch and put it in the reaction kettle, add equal quality water, stir continuously and raise the temperature to 60°C, adjust the pH=9, add 30wt% hydrogen peroxide solution, stir for 1h, then add sodium sulfite, stir for 10min, then Add a PVA solution with a concentration of 10% and stir for 25 minutes, then add a chitosan solution with a concentration of 5% and stir for 0.5 hours, heat up to 70°C and gelatinize to obtain a starch-PVA-chitosan adhesive; The amount of hydrogen solution added is 5% of the dry weight of starch, the amount of sodium sulfite added is 10% of the weight of hydrogen peroxide solution; the amount of PVA (dry weight) added is 10% of the dry weight of starch; the amount of chitosan (dry weight) added is 40% of the dry weight of starch;

[0050] (2) Degas the obtained starch-PVA-chitosan adhesive under the condition of vacuum degree of 0.95 MPa, scrape a film on a chrome-plated steel plate, dry at a constant temperature of 40°C for 2...

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Abstract

The invention discloses a starch-PVA (Polyvinyl Alcohol)-chitosan blended film for a plywood and a method for preparing the plywood through hot-pressing. The starch-PVA-chitosan blended film is prepared by oxidizing a starch, adding a PVA and chitosan, gelatinizing, degassing under vacuum, coating the film and drying; and when the plywood is prepared, the veneer-sized blended film is put between veneers to be assembled and thermally pressed. A product of the blended film has the various advantages of wide source of raw materials, good biodegradability, simple hot-pressing process, non-toxicity, environmentally friendliness, convenience in storage and transportation and the like, the plywood pressed by using the product is good in physical and mechanical properties, and the blended film isexpected to become a novel adhesive film for the plywood.

Description

technical field [0001] The invention belongs to the technical field of wood-based panels, and in particular relates to a starch-PVA-chitosan blend film for plywood and a method for preparing plywood by hot pressing it. Background technique [0002] With the development of China's economy, the wood industry has developed rapidly, and China has become the world's largest wood-based panel production, consumption and import and export trading country. Among the adhesives used in wood-based panels, urea-formaldehyde resin adhesives, phenolic resin adhesives and melamine-formaldehyde resin adhesives still dominate, but formaldehyde volatilization has great damage to human health. [0003] Chinese patent (CN 203807377U) discloses a thermoplastic film structure for hot-pressed plywood. The film used is a thermoplastic petroleum-based material that cannot be biodegraded. Moreover, when the thermoplastic adhesive film is cooled and solidified and then heated or the ambient temperatur...

Claims

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Application Information

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IPC IPC(8): C09J7/10C09J7/30C09J103/02C09J105/08C09J129/04
CPCC08L2205/03C09J7/10C09J7/30C09J103/02C09J2403/00C09J2405/00C09J2429/00C08L5/08C08L29/04
Inventor 李德宏刘景宏庄标榕吴振增盛佳乐谢拥群魏微魏起华候鑫均
Owner FUJIAN AGRI & FORESTRY UNIV
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