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Modified starch adhesive and preparation method thereof

A starch adhesive and modified technology, applied in the directions of adhesives, adhesive types, graft polymer adhesives, etc., can solve problems such as poor bonding strength, water resistance and stability, and achieve low cost and benefit for grafting reaction. , Improve the effect of grafting efficiency

Inactive Publication Date: 2016-12-14
山东熙来淀粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past two years, some people have carried out exploration and research on starch adhesives, using starch as the main raw material, performing acid hydrolysis, oxidation, graft copolymerization modification and other treatments, and finally adding certain additives to prepare starch glue. The starch prepared by this process Adhesive has the advantages of low cost and environmental protection, but has defects such as bonding strength, water resistance, and poor stability.

Method used

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  • Modified starch adhesive and preparation method thereof
  • Modified starch adhesive and preparation method thereof
  • Modified starch adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]

[0049] 100g of corn esterified starch is added with water to make starch milk with a mass ratio of 30% (m / m) on a dry basis of starch, and 700ppm of α-amylase is added to the starch milk. After mixing evenly, the temperature of the system is adjusted to 85 ℃, keep warm for 15 minutes; adjust the temperature of the system to 95 ℃, keep warm for 10 minutes and then cool down to 70 ℃, adjust the pH value to 4.2 with 10% hydrochloric acid solution, add 0.3g of initiator in 5 batches, add 2g of polymer emulsifier, add 80g Pre-configured as a 10% (m / m) polyvinyl alcohol solution, then slowly add 75g of vinyl acetate dropwise in 5 times, the reaction time is 3h, adjust the pH to 6.5 with 5% sodium hydroxide solution, cool to 50°C, Add 15g of urea, 4g of glycerin and 2g of octanol, stir for 0.5h, then continue to cool down to 30°C, pack, seal and set aside.

Embodiment 2

[0051]

[0052]

[0053]Add water to cassava esterified starch to make starch milk with a mass ratio of 32% (m / m) on a dry basis of starch, add 700ppm of α-amylase to the starch milk, mix well, and adjust the system temperature to 85°C , keep warm for 15 minutes, adjust the temperature of the system to 95°C, keep warm for 10 minutes, cool down to 70°C, adjust the pH value to 4.4 with 10% sulfuric acid solution, add 0.25g of compound initiator intermittently in 6 times, add 2.5g of polymer emulsifier, add 90g of polyvinyl alcohol solution pre-configured as 10% (m / m), then slowly add 80g of vinyl acetate dropwise in 6 times, the reaction time is 4h, adjust the pH to 7.0 with 5% sodium hydroxide solution, and cool down to 50°C , add 15g of urea, 5g of glycerin and 2.5g of octanol, stir for 0.5h and continue to cool down to 30°C, pack, seal and set aside.

Embodiment 3

[0055]

[0056] Add water to cassava esterified starch to make starch milk with a mass ratio of 35% (m / m) on a dry basis of starch, add 850ppm of α-amylase to the starch milk, mix well, adjust the system temperature to 80°C, and keep warm 15min, adjust the temperature of the system to 95°C, keep it warm for 10min, cool down to 70°C, adjust the pH value to 4.6 with 10% hydrochloric acid solution, add 0.5g of compound initiator intermittently in 5 times, add 4.0g of polymer emulsifier, add 100g of pre- Configure it as a 15% (m / m) polyvinyl alcohol solution, then slowly add 80 g of vinyl acetate dropwise in 5 times, the reaction time is 3.5 h, adjust the pH to 7.1 with 5% sodium hydroxide solution, cool to 50 ° C, Add 20g of urea, 5.0g of glycerin and 3.0g of octanol, stir for 0.5h, then continue to cool down to 30°C, pack, seal and set aside.

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Abstract

The invention discloses a modified starch adhesive which comprises the following components in parts by mass: 100 parts of esterified starch, a right amount of alpha-amylase, 0.2-1 part of initiator, 1-4 parts of high-polymer emulsifier, 6-15 parts of polyvinyl alcohol, 70-80 parts of vinyl acetate, 10-20 parts of urea, 1-3 parts of octanol, 2-8 parts of glycerol and a right amount of water. By adding the right amount of water, the esterified starch can be made into starch milk with the starch concentration of 25-35% (m / m) on dry basis. The concentration of the alpha-amylase in the starch milk is 500-1000 ppm. The invention also discloses a preparation method of the modified starch adhesive. The bonding strength and water resistance of the modified starch adhesive are obviously enhanced. The bioenzyme is used for degradation, the material before grafting has uniform viscosity, and is beneficial to grafting reaction; and thus, the modified starch adhesive has the advantages of low cost, high safety and environment friendliness.

Description

technical field [0001] The invention belongs to the field of adhesive preparation, in particular to a modified starch adhesive and a preparation method. Background technique [0002] Starch has the advantages of being renewable, pollution-free, low-cost, and biodegradable. Using starch as the main raw material to prepare wood adhesives can greatly reduce the amount of non-renewable resource petroleum monomers and reduce costs. It does not contain formaldehyde and is environmentally friendly. The prospect of completely replacing adhesives containing free formaldehyde such as urea-formaldehyde resin, phenolic resin, and melamine-formaldehyde resin. In the past two years, some people have carried out exploration and research on starch adhesives, using starch as the main raw material, performing acid hydrolysis, oxidation, graft copolymerization modification and other treatments, and finally adding certain additives to prepare starch glue. The starch prepared by this process Ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F218/08C08F4/30C08F2/28C09J151/02
CPCC08F251/00C08F2/28C08F4/30C09J151/02
Inventor 吕志红
Owner 山东熙来淀粉有限公司
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