Oxidized corn starch adhesive and preparation method thereof

A technology for oxidizing corn starch and corn starch, which is applied in the field of starch adhesives and applied fine chemicals. It can solve the problems of slow drying speed, poor water loss rate of starch glue, thickening of starch adhesive, etc., and achieve fast drying speed and high initial viscosity. Large, strong adhesive effect

Inactive Publication Date: 2020-02-18
SHAANXI YUTENG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional starch adhesives oxidize the hydroxyl groups in the starch and the empty orbitals of the outermost electrons of the boron atoms in the crosslinking agent to form a network structure ligand during the crosslinking process, resulting in thickening of the starch adhesive and poor fluidity
The solid content is relatively low, so that the water loss rate of starch glue is poor and the drying speed is slow

Method used

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  • Oxidized corn starch adhesive and preparation method thereof
  • Oxidized corn starch adhesive and preparation method thereof
  • Oxidized corn starch adhesive and preparation method thereof

Examples

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preparation example Construction

[0035] A kind of preparation method of oxidized cornstarch adhesive of the embodiment of the present invention specifically comprises the following steps:

[0036] 1) Prepare the raw materials according to the above ratio, the water is deionized water, prepare two parts, one for dissolving cornstarch, and the other for dissolving other raw materials.

[0037] 2) Add cornstarch into the reactor, add water and stir continuously until a uniform milky white suspension is formed, add catalyst, heat and stir for 20-40min to carry out pre-gelatinization.

[0038] 3) After pregelatinization, add H 2 o 2 Add NaOH dropwise under constant stirring to adjust the pH=8-10, heat and stir for 1-2 hours for oxidation.

[0039] 4) After oxidation, add the remaining NaOH and stir for 25-40 minutes for gelatinization.

[0040] 5) After gelatinization, add a cross-linking agent and stir for 20-40 minutes to carry out cross-linking.

[0041] 6) After cross-linking, add polyacrylamide and stir f...

Embodiment 1

[0049] A kind of preparation method of oxidized cornstarch paste adhesive of the embodiment of the present invention, concrete steps are as follows:

[0050] The raw material composition and weight / number ratio of the adhesive are: 15 parts of cornstarch, 1.25 parts of NaOH, H 2 o 2 2.5 parts, 75 parts of water, 0.03 parts of ferrous sulfate catalyst, 0.05 parts of surfactant, 0.05 parts of polyacrylamide, 0.15 parts of borax crosslinking agent, 0.25 parts of urea thinner, 0.03 parts of tributyl phosphate defoamer, catalyst 0.35 part of dry agent, 0.1 part of preservative.

[0051] Prepare raw materials according to the ratio, divide 75 parts of water into 50 parts for dissolving cornstarch, and 25 parts of water for dissolving NaOH.

[0052] Add 15 parts of cornstarch into the reactor, then add 50 parts of water and stir until a uniform milky white suspension is formed, then add 0.03 parts of ferrous sulfate catalyst, raise the temperature to 40°C and continue stirring for ...

Embodiment 2

[0054] A kind of preparation method of oxidized cornstarch paste adhesive of the embodiment of the present invention, concrete steps are as follows:

[0055] The raw material composition and weight / number ratio of adhesive are: 15 parts of cornstarch, 1.25 parts of NaOH, H 2 o 2 2.5 parts, 75 parts of water, 0.03 parts of ferrous sulfate catalyst, 0.05 parts of surfactant, 0.05 parts of polyacrylamide, 0.15 parts of sodium trimetaphosphate crosslinking agent, 0.25 parts of urea thinner, 0.03 parts of tributyl phosphate defoamer parts, 0.35 parts of sodium bentonite drier, and 0.1 parts of acrylic preservative.

[0056] Prepare raw materials according to the ratio, divide 75 parts of water into 50 parts for dissolving cornstarch, and 25 parts of water for dissolving NaOH.

[0057] Add 15 parts of cornstarch into the reactor, then add 50 parts of water and stir until a uniform milky white suspension is formed, then add 0.03 parts of ferrous sulfate catalyst, raise the temperat...

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Abstract

The invention discloses an oxidized corn starch adhesive and a preparation method thereof. The oxidized corn starch adhesive is prepared from the following raw materials in parts by weight: 8-30 partsof corn starch, 0.9-2.0 parts of NaOH, 1-3 parts of H2O2, 60-80 parts of water, 0.01-0.12 part of a catalyst, 0.01-0.20 part of a surfactant, 0.02-0.20 part of polyacrylamide, 0.1-2 parts of a cross-linking agent, 0.1-1 part of a diluent, 0.01-0.1 part of a defoaming agent, 0.1-5 parts of a drier and 0.01-0.5 part of a preservative. The preparation method comprises the following steps: pre-gelatinizing, oxidizing, gelatinizing, crosslinking and modifying the corn starch to obtain the oxidized corn starch adhesive; and the prepared oxidized corn starch adhesive is good in mechanical property,large in initial adhesion, high in adhesive force, high in drying speed and good in film-forming property and stability.

Description

technical field [0001] The invention belongs to the technical field of applied fine chemicals, relates to the field of starch adhesives, in particular to an oxidized corn starch adhesive and a preparation method thereof. Background technique [0002] Corn starch is a green and environmentally friendly renewable natural product, which is cheap and easy to obtain and has good degradability. Corn starch adhesives are widely used in papermaking, construction, printing and binding industries, medical care and carton packaging bonding industries, etc. However, the current traditional corn starch adhesives have some shortcomings such as unstable quality, low adhesion, poor fluidity, and slow drying speed. In the traditional method, the expansion degree of starch aggregates is small, the oxidation is not complete, the number of carboxyl groups generated is relatively small, and the cohesive force is low. It may be due to the rearrangement and combination of gelatinized and swollen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J11/08C09J11/06C09J11/04C09J11/00C08B31/18
CPCC08B31/185C08K2003/265C08L2205/03C09J11/00C09J11/04C09J11/06C09J11/08C09J103/10C08L33/26C08L29/04C08K5/521C08K5/42C08K3/26C08K5/098C08K13/02
Inventor 陈力群
Owner SHAANXI YUTENG IND
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