Preparation method and application of starch-based biological latex

A biological latex and starch-based technology, applied in the field of coated paper, to achieve the effect of wide source of raw materials, moderate viscosity, and avoid over-reliance

Inactive Publication Date: 2019-10-15
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the EcoSynthetix company in the United States has taken the lead in successfully developing a solid powder starch-based bio-latex, which has excellent performance and is easy to transport and use, and has become the most attractive product in the latex field. The technology has not yet been applied and put into production on a large scale in Chinese enterprises

Method used

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  • Preparation method and application of starch-based biological latex
  • Preparation method and application of starch-based biological latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of starch-based biological latex, after the original tapioca starch is ground by a ball mill for 2 hours, the suspension is prepared by mass percentage, including the following components:

[0028]

[0029] crafting process:

[0030] The original tapioca starch and zirconia beads with different diameters were placed in a ball mill tank at a mass ratio of 1:1.5, and after grinding for 1 hour, the rotating direction of the ball mill was changed and the grinding was continued for 1 hour, and then the cooled starch was taken out. Make starch and buffer solution into starch milk according to the recipe, put it in a 37°C water bath, add starch modifiers, glycerol and propylene glycol, heat to 95°C for gelatinization, keep it warm for 30min, and cool to room temperature. Add oxidizing agent and copper sulfate and heat up to 40°C, react for 60min under cantilever stirrer stirring, adjust system pH to 9, add additives and cross-linking agent, heat up to 70°C, react for...

Embodiment 2

[0032] A kind of starch-based biological latex, after the original cassava starch is ground by a ball mill for 8 hours, the suspension is prepared by mass percentage, including the following components:

[0033]

[0034] crafting process:

[0035] The original tapioca starch and zirconia beads with different diameters were placed in a ball mill tank at a mass ratio of 1:1.5. After grinding for 1 hour, the rotation direction of the ball mill was changed and the grinding was continued for 1 hour. Grinding in this way was repeated for 8 hours, and the cooled starch was taken out. According to the formula, starch and buffer solution are formulated into starch milk, placed in a 37°C water bath, added with starch modifiers, polyvinyl alcohol, and ethylene glycol, heated to 80°C for gelatinization, kept for 50 minutes, and cooled to room temperature. Add oxidizing agent and copper sulfate and heat up to 30°C, react for 100min under cantilever stirrer stirring, adjust system pH to ...

Embodiment 3

[0037] The bio-latex obtained in Examples 1 and 2 of the present invention directly replaces carboxylated styrene-butadiene latex at a substitution ratio of 30%, and is used as a coating adhesive in paper coating. They are respectively marked as samples 1 and 2. The bio-latex prepared by mechanically pretreated starch is marked as 3, and the performance of the finished paper is tested by single-sided single-coating with commercially available electrostatic copy paper as the base paper as follows:

[0038] sample 1 2 3 Carboxylated styrene-butadiene latex Coating solid content% 60 58 59 59 Coating weight g / m 2

[0039] It can be seen from the above table that the starch-based biological latex prepared by the ball milling pretreated starch and biochemical composite modification provided by the present invention is applied to coated paper, partially replacing carboxylated styrene-butadiene latex, and the whiteness of coated paper is significantly impro...

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Abstract

The invention belongs to a preparation method of starch-based biological latex. The starch-based biological latex comprises the following components: 35-55% of absolutely dry starch, 0.1-10wt% of a plasticizer, 0.1-8wt% of a lubricant and 0.01-35wt% of a starch modifier. Starch emulsion is prepared from a buffer solution prepared from citric acid-disodium hydrogen phosphate. The preparation methodcomprises the following steps: 1) carrying out mechanical pretreatment on raw starch, wherein the pretreatment method comprises the steps of mechanically grinding dry powder by a ball mill for 0.5-12h; 2) preparing a ball-milled raw starch sample into a suspension liquid with the mass concentration of 40-55% by using a buffer solution, placing the suspension liquid in a water bath kettle at thetemperature of 30-55 DEG C, adding the starch modifier, and after heating to the temperature of 80-95 DEG C, insulating for 30-45 minutes; 3) cooling the emulsion in the step 2 to room temperature, adding a catalyst, and adding an oxidant to oxidize for 30-120 min at the temperature of 25-50 DEG C; 4) adding the starch modifier, adjusting pH of the emulsion to be 7-10, and adding a cross-linking agent to react for 20-90 min at the temperature of 50-70 DEG C; and 5) cooling and sieving to obtain the starch-based biological latex prepared by a ball-milling mechanical pretreatment composite biochemical modification method. The preparation method of the biological latex provided by the invention is relatively simple and easy to operate, and the product has the characteristics of moderate viscosity, strong adhesive force and high solid content, and can partially or completely replace petroleum-based latex in the papermaking industry.

Description

technical field [0001] The invention relates to a starch-based biological latex and a preparation method thereof, which are mainly used in the field of light industrial papermaking, especially in the field of coated paper. Background technique [0002] Today, when global problems such as energy crisis and environmental pollution are frequent, the possibility of using green renewable and biodegradable biomass materials such as starch and cellulose to replace petroleum-based and other non-renewable products has become the research of researchers at home and abroad. hotspot. Starch is mainly stored in plants in the form of carbohydrates. It is a renewable and degradable polymer biomass resource abundant in nature. It is widely used in various industries, such as: medicine, chemical industry, biology, food, Paper coating and other fields. Starch-based bio-latex is a green and environmentally friendly water-soluble adhesive. It is the most likely ideal substitute for petroleum-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/14C08B31/18C08B31/00
CPCC08B31/006C08B31/185D21H19/14
Inventor 刘洪斌刘利琴安兴业
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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