A kind of dialdehyde starch and preparation method thereof

A technology of dialdehyde starch and starch, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve the problems of cumbersome and complicated reaction steps, long oxidation reaction time, and complicated post-treatment process , to achieve the effect of simple post-treatment process, improved reactivity, and reduced difficulty of production process

Active Publication Date: 2018-09-07
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are also research attempts to use degradation agents to degrade dialdehyde starch to make its molecular weight smaller, so as to increase its aldehyde content and reactivity, thereby improving its performance. However, this type of preparation method has the following problems: the reaction steps are cumbersome and complicated, The double-formylation and degradation process of starch is divided into two steps. Among them, the double-formylation reaction needs to adjust the pH of the system, and the oxidation reaction takes a long time; the degradation process uses a low concentration of degradation agent, which leads to high reaction temperature and long reaction time during the degradation process. Long, the whole preparation process has high requirements on reaction conditions, the post-treatment process is complicated, and the process is time-consuming and energy-consuming, which is not conducive to industrial production

Method used

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  • A kind of dialdehyde starch and preparation method thereof
  • A kind of dialdehyde starch and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of embodiment of dialdehyde starch preparation method of the present invention, comprises the following steps:

[0028] (1) the sodium periodate of 150 weight parts and the hydrochloric acid of 15 weight parts 36.5wt% are dissolved in the deionized water of 650 weight parts, then add the corn starch of 162 weight parts, be made into corn starch mass fraction and be 16.6% starch milk.

[0029] (2) Transfer the starch milk obtained in step (1) to a reaction kettle with a stirrer, and perform acidolysis and oxidation reaction in a water bath at 30° C. for 5 hours. After the reaction, the obtained material is first washed with deionized water, and then pumped Filtrate until the pH of the filtrate is 7.0 (the material is neutral at this time), and then place it in an oven at 40° C. to dry to obtain the dialdehyde starch of the present invention.

[0030] After testing, the content of aldehyde groups in the dialdehyde starch prepared in this embodiment is 91.71%, and ...

Embodiment 2

[0032] A kind of embodiment of dialdehyde starch preparation method of the present invention, comprises the following steps:

[0033] (1) the sodium periodate of 200 weight parts and the sulfuric acid of 150 weight parts 98wt% are dissolved in the deionized water of 1458 weight parts, then add the potato starch of 162 weight parts, be made into the starch that potato starch massfraction is 8.2% milk.

[0034] (2) Transfer the starch milk obtained in step (1) to a reaction kettle with a stirrer, and perform acidolysis and oxidation reaction in a water bath at 40°C for 3 hours. After the reaction, the obtained material is first washed with deionized water, and then pumped Filtrate until the pH of the filtrate is 7.0 (the material is neutral at this time), and then dry in an oven at 50° C. to obtain the dialdehyde starch of the present invention.

[0035] After testing, the content of aldehyde groups in the dialdehyde starch prepared in this embodiment is 87.48%, and the average...

Embodiment 3

[0037] A kind of preparation method of dialdehyde starch of the present invention, comprises the following steps:

[0038] (1) the sodium periodate of 257 parts by weight, the hydrochloric acid of 225 parts by weight 36.5wt% and the sulfuric acid of 75 parts by weight 98wt% are dissolved in the deionized water of 3888 parts by weight, then add the rice starch of 162 parts by weight, be made into Starch milk with a mass fraction of rice starch of 3.5%.

[0039] (2) Transfer the starch milk obtained in step (1) to a reaction kettle with a stirrer, and perform acidolysis and oxidation reaction in a water bath at 50°C for 0.5 hours. After the reaction, the obtained material is first washed with deionized water, and then pumped Filter until the pH of the filtrate is 7.0 (the material is neutral at this time), and then place it in an oven at 60° C. to dry to obtain the dialdehyde starch of the present invention.

[0040] After testing, the content of aldehyde groups in the dialdehy...

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Abstract

The invention discloses a preparation method of dialdehyde starch. The preparation method includes the steps of firstly, adding oxidizing agent and acidolysis agent into deionized water, mixing, adding starch, and stirring to prepare starch milk; secondly, transferring the starch milk obtained in the first step to a reaction kettle to perform acidolysis oxidation reaction, washing the reaction product until the reaction product is neutral, and drying to obtain the dialdehyde starch. The preparation method is short in reaction time, simple to operate and suitable for industrial application. The invention further discloses the dialdehyde starch prepared by the method, and the dialdehyde starch is high in aldehyde group content, high in reaction activity and low in gelatinization viscosity.

Description

technical field [0001] The invention relates to the field of wood and bamboo adhesives, in particular to a dialdehyde starch and a preparation method thereof. Background technique [0002] The raw materials used in aldehyde organic adhesives come from non-renewable petrochemical resources. With the gradual depletion of petrochemical resources and the increasing awareness of environmental protection, the development of renewable, green and environmentally friendly wood adhesives has become an urgent need for the wood industry. Starch is a kind of natural polymer material with low price, wide sources, green and environmental protection, which is non-toxic and non-polluting. If some or all of the polymer materials synthesized by petrochemical resources are replaced by starch and applied to wood adhesives, it will play a significant role in promoting the adhesive industry and the starch industry. Therefore, in recent years, starch-based adhesives, as a kind of green and environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18C09J161/12C08G8/22
CPCC08B31/185C08G8/22C09J161/12
Inventor 左迎峰刘文杰吴义强李萍肖俊华
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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