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Preparation method of sizing enhancer

A technology of reinforcing agent and initiator, which is applied in the field of preparation of sizing reinforcing agent, can solve the problems of high cost of dry strength agent, low retention rate of sizing agent, influence on sizing and strengthening effect, etc., and achieve good strengthening effect, The effect of fast sizing and curing speed and reducing energy consumption

Active Publication Date: 2018-07-31
九洲生物技术(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of the dry strength agent added in the pulp is high, the retention rate of the sizing agent in the pulp is low, and the surface sizing agent needs to be used in conjunction with the starch liquid, which needs to be boiled on site. The viscosity difference of the starch liquid will affect the sizing and processing. Enhancement
[0003] At present, there is no product in China that can have both sizing and strengthening effects. It can be used as a strengthening agent and sizing agent in the slurry, and can also be used alone as a surface sizing strengthening agent.

Method used

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  • Preparation method of sizing enhancer

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preparation example Construction

[0028] The preparation method of sizing enhancer is to mix starch and water according to the mass ratio of 1:2~5, stir and heat up, add starch viscosity reducer, degrade at 75~95°C with heat preservation, and after the viscosity reaches 5~50mPa, blow nitrogen, Cool down to 60-80°C, add an initiator, and react for 10-30 minutes to activate the degraded starch molecular chains to generate free radicals; add hydrophobic monomer mixture, hydrophilic monomer Bulk solution and initiator aqueous solution, control the dropping time for 20-90 minutes, during which the reaction temperature is controlled at 65°C-95°C; after dropping, control the temperature at 80°C-95°C for 10-60 minutes, add the initiator, continue React at 80°C-95°C for 30-90 minutes. After there is no reflux in the reactor and the viscosity reaches 50-500mPa.s at 25°C, add a terminator, cool down to 30°C, add an external linking agent, and adjust the pH value to 4. ~6, that is, the sizing enhancer is obtained.

[002...

Embodiment 1

[0045] The main raw materials used and the amount of feed are shown in the table below:

[0046]

[0047]

[0048] Add 180 parts of deionized water to the reaction kettle with agitator, thermometer, reflux condenser and nitrogen inlet pipe, slowly add 60 parts of tapioca starch under stirring, add 15 parts of ammonium persulfate with 20% viscosity reducer, and heat up to 90°C, keep warm at 88-93°C for 60 minutes, and check the viscosity at 85°C to be 15mPa.s; pass nitrogen gas, when the temperature drops to 75°C, add 4 parts of the first initiator 5% ammonium persulfate aqueous solution, and react for 15 Minutes, then drop the hydrophobic monomer mixed solution, hydrophilic monomer mixed solution, internal crosslinking monomer solution and initiator aqueous solution simultaneously, wherein, the hydrophobic monomer mixed solution consists of 30 parts of styrene, 15 parts of butyl acrylate Composition, the hydrophilic monomer mixed solution consists of 30 parts of acrylami...

Embodiment 2

[0050] The main raw materials used and the amount of feed are shown in the table below:

[0051]

[0052] Add 180 parts of deionized water to a reaction kettle with a mixer, a thermometer, a reflux condenser and a nitrogen inlet pipe, slowly add 90 parts of cationic starch (substitution degree 0.02) under stirring, and add 0.036 parts of α-medium temperature amylase, Raise the temperature to 80°C, keep it warm for 20 minutes between 78°C and 82°C, and check the viscosity at 77°C to be 10mPa.s; pass nitrogen gas, when the temperature drops to 75°C, add the first initiator 5% ferrous sulfate aqueous solution 3 parts, 6 parts of 10% hydrogen peroxide aqueous solution, reacted for 20 minutes, and then added dropwise the hydrophobic monomer mixed solution, the hydrophilic monomer mixed solution, the internal crosslinking monomer solution and the aqueous initiator solution, wherein the hydrophobic monomer The body mixed solution is composed of 15 parts of styrene, 20 parts of acr...

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Abstract

The invention discloses a preparation method of a sizing enhancer. The method is as follows: after cooking and viscosity reduction of starch, introducing nitrogen, cooling to 60-80 DEG C, adding an initiator, and reacting for 10 to 30 minutes; dropwise adding a hydrophobic monomer mixture, a hydrophilic monomer mixture solution, an internal crosslinking monomer solution and an initiator aqueous solution respectively, wherein the dropwise-adding time is controlled to 20 to 90 minutes, and the reaction temperature is controlled at 65 DEG C to 95 DEG C during the time; after the dropwise additionis completed, controlling the temperature at 80 DEG C-95 DEG C for reacting for 10 to 60 minutes, replenishing an initiator, continuing to react at 80 DEG C to 95 DEG C for 30 to 90 minutes, after areactor is free of reflux and the viscosity at 25 DEG C reaches 50 to 500 mPa.s, adding a terminator, cooling, adding an external crosslinking agent, and adjusting the pH to 4 to 6 to obtain the sizing enhancer. The sizing enhancer can be used for in-slurry sizing and surface sizing, and has the advantages such as good reinforcing effect, fast sizing and aging speed, and good resistance to moisture respiration.

Description

technical field [0001] The invention relates to a preparation method of a sizing reinforcing agent, and belongs to the technical field of polymer synthesis and papermaking sizing agents and reinforcing agents. Background technique [0002] According to statistics, the total national output of paper and cardboard in 2016 was 108.55 million tons, of which 65% of the total output was made from waste paper pulp, and more than 85% of paper and cardboard required sizing. In view of the current situation that waste paper pulp is mainly used as raw material for papermaking in my country, in order to improve the quality of paper products, domestic papermaking enterprises generally adopt the method of adding dry strength agent, sizing agent in pulp, or adding dry strength agent in pulp combined with surface sizing. However, the cost of the dry strength agent added in the pulp is high, the retention rate of the sizing agent in the pulp is low, and the surface sizing agent needs to be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F212/08C08F220/18C08F220/56C08F220/34C08F220/06C08F220/58C08F220/48C08F218/08C08F220/54C08F222/02C08F220/20C08F220/32D21H21/16D21H21/18
CPCD21H21/16D21H21/18C08F251/00C08F220/1806C08F220/58C08F220/34C08F220/585C08F220/1804C08F220/325
Inventor 詹新岭张德合戴玲封玉凤
Owner 九洲生物技术(苏州)有限公司
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