Preparation method of modified starch adhesive

A starch adhesive and modification technology, which is applied in the direction of starch-derived adhesives, adhesive additives, adhesive types, etc., can solve the problems of combustion emissions polluting the environment, workshop temperature rise, and high gelatinization temperature. Achieve the effects of avoiding too strong alkalinity, increasing mass transfer rate, and improving water resistance

Active Publication Date: 2020-06-12
湖北大胜达包装印务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional corrugated cardboard production needs to use high temperature to gelatinize starch raw rubber for cardboard bonding. Usually, 8-12 kg of steam pressure is required. Most of the steam is supplied by coal-fired boilers, which not only consumes a lot of energy, but also pollutes the combustion emissions. surroundings
[0005] Most corrugated cardboard production lines today use a steam pressure of 7 to 10 kg and a temperature of about 155 to 180 degrees to produce normally. If the bonding effect of four-layer boards and seven-layer boards is not satisfactory, further improvement is needed. temperature increases vapor pressure
This is mainly due to the high gelatinization temperature of starch adhesives, generally above 70°C.
In addition, high-temperature production will also increase the temperature of the workshop, and the working environment for employees will be harsh.

Method used

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  • Preparation method of modified starch adhesive
  • Preparation method of modified starch adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: In the spray loop reactor (1) using Venturi nozzle, add 400 parts of water, 100 parts of tapioca starch, 100 parts of 10% polyvinyl alcohol solution, 2 parts of Sodium tripolyphosphate, 8 parts of hydrogen peroxide, 0.5 part of ferrous sulfate powder, open described external circulation pump (5) and carry out high-speed jet mixing;

[0031] Step 2: Control the temperature at 20°C, slowly add 10 parts of 20 parts of monochloromethane gas and sodium hydroxide solution to the injection loop through the second feed port (3) and the first feed port (4) respectively In the reactor, the jet reactor is sprayed and mixed to realize a sufficient reaction between the materials, and the feeding time is 2 hours. After the feeding is completed, the reaction is completed after the jet loop reactor continues to react for 2 hours.

Embodiment 2

[0033] Step 1: In the spray loop reactor (1) using Venturi nozzle, add 350 parts of water, 100 parts of potato starch, 80 parts of 8% polyvinyl alcohol solution, 1.6 parts in the first feed port (4) successively Ferric chloride, 5 parts of hydrogen peroxide, 0.5 part of ferrous sulfate powder, open the external circulation pump (5) and carry out high-speed jet mixing.

[0034] Step 2: Control the temperature at 40°C, slowly add 8 parts of monochloromethane gas and 15 parts of sodium hydroxide solution to the injection loop through the second feed port (3) and the first feed port (4) respectively In the reactor, the jet reactor is sprayed and mixed to realize a sufficient reaction between the materials, and the feeding time is 2 hours. After the feeding is completed, after the jet loop reactor continues to react for 1 hour, the reaction ends;

Embodiment 3

[0036] Step 1: In the injection loop reactor (1) using Venturi nozzle, add 400 parts of water, 100 parts of cornstarch, 80 parts of 8% polyvinyl alcohol solution, 1 part of Alum, 5 parts of hydrogen peroxide, 0.5 part of ferrous sulfate powder, open the external circulation pump (5) and carry out high-speed jet mixing.

[0037] Step 2: Control the temperature at 40°C, slowly add 8 parts of monochloromethane gas and 16 parts of sodium hydroxide solution to the injection loop through the second feed port (3) and the first feed port (4) respectively In the reactor, the jet reactor is sprayed and mixed to realize a sufficient reaction between the materials, and the feeding time is 2 hours. After the feeding is completed, after the jet loop reactor continues to react for 1 hour, the reaction ends;

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Abstract

The invention provides a preparation method of a modified starch adhesive. The preparation method comprises the following steps: sequentially adding water, starch, a polyvinyl alcohol solution, a cross-linking agent, hydrogen peroxide and ferrous sulfate powder into a jet loop reactor through a first feed port, and starting an external circulating pump to perform high-speed jet mixing; and slowlyadding methane chloride gas and an alkali liquor into the reactor through a second feed port and the first feed port for several times respectively for mixing and full reacting, continuously reactingfor 1-2 h in the jet loop reactor after the feeding is finished, and finishing the reaction, wherein the feeding period is 1-2 h. The jet loop reactor based on the Venturi effect is adopted, the masstransfer rate of the jet loop reactor is greatly increased, due to the fact that a Venturi nozzle is used, strong suction force is generated by local high vacuum in the using process, gas-phase reaction materials can be automatically sucked in, and sufficient mixing and complete reaction are facilitated; and the methane chloride gas and the alkali liquor are slowly added by several times, so thatthe product quality reduction caused by excessive alkalinity and massive side reactions is avoided.

Description

technical field [0001] The invention relates to the technical field of adhesive preparation, and more specifically, the invention relates to a preparation method of a modified starch adhesive. Background technique [0002] Starch glue is the abbreviation of starch adhesive, which is a natural adhesive made from starch. Starch is a natural polymer produced by green plants through photosynthesis, so starch glue belongs to vegetable glue. [0003] Starch glue has the characteristics of rich sources, low price, convenient use, and non-toxicity. It is widely used in the manufacture of corrugated cardboard boxes, stamp gluing, wood processing, book binding, etc. [0004] my country's corrugated packaging industry is an industry with large scale, high energy consumption and large pollution sources. Traditional corrugated cardboard production needs to use high temperature to gelatinize starch raw rubber for cardboard bonding. Usually, 8-12 kg of steam pressure is required. Most of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/08C09J129/04C09J11/04B01J19/26
CPCB01J19/26C08K2003/3045C08K2003/324C08K2003/387C09J11/04C09J103/08C08L29/04C08K3/30C08K3/32C08K3/16C08K3/38
Inventor 索艳格黄煜琪王召霞孙俊军张治国
Owner 湖北大胜达包装印务有限公司
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