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Modified starch hot melt adhesive and preparation method thereof

A hot-melt adhesive and starch technology, applied in the directions of starch-derived adhesives, adhesives, adhesive types, etc., can solve the problems of poor initial adhesion, stable bonding strength, and limit large-scale use, and achieve high bonding strength. , good viscosity, good water resistance

Inactive Publication Date: 2020-04-03
江门市泰联新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, general starch adhesives are not as good as traditional adhesives in terms of initial adhesion, stability, and bonding strength.
This limits its large-scale use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present invention provides a kind of modified starch hot-melt glue and preparation method thereof, and its preparation method comprises the following steps; A, the preparation of modified starch

[0028] (1) Mixing 60 parts of cornstarch in a reaction tank and adding water to make starch milk, adding an appropriate amount of 2%-3% sodium hydroxide solution to adjust the pH of the solution to 10-11;

[0029] (2) Oxidative gelatinization Add 10 parts of sodium hypochlorite (the content of available chlorine is greater than 10%) and stir, and place the reaction tank in a microwave reactor for 1-2h; then heat to 40-55 degrees, and stir to make the starch milk fully paste change;

[0030] (3) Polycondensation Add 18 parts of polyvinyl alcohol and 10 parts of acrylamide respectively to the gelatinized starch milk, and stir for 40-60 minutes;

[0031] (4) Add 10 parts of norbornane diisocyanate at the end of glue adjustment, and continue stirring for 10-20 minutes to obta...

Embodiment 2

[0038] The present invention provides a kind of modified starch hot-melt glue and preparation method thereof, and its preparation method comprises the following steps; A, the preparation of modified starch

[0039] (1) Blending 70 parts of corn starch in a reaction tank with water to prepare starch milk, adding an appropriate amount of 2%-3% sodium hydroxide solution to adjust the pH of the solution to 10-11;

[0040] (2) Oxidative gelatinization Add 15 parts of sodium hypochlorite (the content of available chlorine is greater than 10%) to stir, and place the reaction tank in a microwave reactor to react for 1-2h; then heat to 40-55 degrees, stir to make the starch milk fully paste change;

[0041] (3) Polycondensation Add 15 parts of polyvinyl alcohol and 15 parts of acrylamide respectively to the gelatinized starch milk, and stir for 40-60 minutes;

[0042] (4) Add 15 parts of norbornane diisocyanate at the end of glue adjustment, and continue stirring for 10-20 minutes to ...

Embodiment 3

[0049] A. Preparation of modified starch

[0050] (1) Mixing 80 parts of cornstarch in a reaction tank and adding water to make starch milk, adding an appropriate amount of 2%-3% sodium hydroxide solution to adjust the pH of the solution to 10-11;

[0051] (2) Oxidative gelatinization Add 13 parts of sodium hypochlorite (the content of available chlorine is greater than 10%) and stir, and place the reaction tank in a microwave reactor for 1-2h; then heat to 40-55 degrees, stir to make the starch milk fully paste change;

[0052] (3) Polycondensation Add 13 parts of polyvinyl alcohol and 20 parts of acrylamide respectively to the gelatinized starch milk, and stir for 40-60 minutes;

[0053] (4) Add 13 parts of norbornane diisocyanate at the end of glue adjustment, and continue stirring for 10-20 minutes to obtain modified starch;

[0054] B. Preparation of modified starch hot melt adhesive

[0055] (1) Mix 50 parts of modified starch prepared in step A with 8 parts of ethyle...

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PUM

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Abstract

The invention relates to a modified starch hot melt adhesive and a preparation method thereof. The modified starch hot melt adhesive comprises, by weight, 45-55 parts of modified starch, 20-30 parts of an ethylene-vinyl acetate copolymer, 15-25 parts of a terpene resin, 5-10 parts of an antioxidant, 5-10 parts of a plasticizer and 5-10 parts of an aromatic agent, wherein the modified starch is prepared from the following raw materials in parts by weight: 60-80 parts of corn starch, 5-10 parts of sodium hydroxide, 10-15 parts of sodium hypochlorite, 13-18 parts of polyvinyl alcohol, 10-20 partsof acrylamide and 10-15 parts of norbornane diisocyanate. According to the invention, natural starch and a terpene resin are adopted as main raw materials to replace a hot melt adhesive of a petroleum raw material, and the starch is modified through sodium hypochlorite oxidation, acrylamide condensation polymerization, norbornane diisocyanate end group sealing treatment and other steps, so that the hot melt adhesive with characteristics of high bonding strength, good water resistance and no toxicity is obtained.

Description

technical field [0001] The invention relates to the field of production and application of adhesives, in particular to a modified starch hot-melt adhesive and a preparation method thereof. [0002] technical background [0003] Hot melt adhesive is a thermoplastic adhesive made of thermoplastic resin as a matrix, supplemented with tackifiers, plasticizers, antioxidants and other ingredients. It is widely used in construction, automobiles, electronics, packaging, medical treatment, clothing, toys, books Binding and other industries. At present, most of the market is dominated by ethylene-vinyl acetate copolymer (EVA) hot melt adhesives, including some polyethylene and polypropylene hot melt adhesive products. Most of the matrix resins are derived from petrochemical products, and most of these resins are relatively difficult to degrade. Moreover, the volatile smell is quite unpleasant. With the gradual depletion of oil resources, the cost of hot melt adhesive products continue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J123/08C09J145/00C09J11/06C08B31/18
CPCC08B31/185C08L2205/03C09J11/06C09J103/10C08L23/0853C08L45/00C08K5/053C08K5/1345
Inventor 郑建南
Owner 江门市泰联新材料有限公司
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