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Dry strength agent and preparation method and application thereof

A technology for enhancing dry strength and dry base, which is applied in the direction of strengthening agent addition, etc., can solve the problems that dry strength and folding resistance cannot be satisfied at the same time, achieve low cost, improve dry strength and tear resistance, and simple production process. Effect

Active Publication Date: 2012-07-11
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to factors such as the fast speed of the paper machine, the emergence of some special papers and the improvement of printing machinery, the above additives often cannot meet the requirements of dry strength and folding resistance when used alone

Method used

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  • Dry strength agent and preparation method and application thereof
  • Dry strength agent and preparation method and application thereof
  • Dry strength agent and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Activation pretreatment of starch: In a four-necked flask equipped with stirring, thermometer, ventilation pipe and feeding channel, add 475g of deionized water, add 2.5g of sodium hydroxide and 0.75g of urea under stirring, place on ice Cool in a bath, add 25 g of dry base starch, and stir to obtain a homogeneous starch paste with a weight concentration of 5%;

[0024] (2) Heat up to 55°C under stirring, add 0.5g of oxidant sodium persulfate and 1g of 3-chloro-2-hydroxypropyltrimethylammonium chloride, carry out oxidative degradation and cationization, after 4 hours of reaction, A translucent viscous liquid was obtained, and the pH value of the system was adjusted to 7.0 with hydrochloric acid;

[0025] (3) Nitrogen, add 85g of acrylamide, 3g of acrylic acid, 10g of methacryloyloxyethyltrimethylammonium chloride, 2g of methyl acrylate and 6g of initiator ammonium persulfate, heat up to 85°C and react for 2 hours , cooled to 25°C to obtain the dry strengthening age...

Embodiment 2

[0027] (1) Activation pretreatment of starch: In a four-necked flask equipped with stirring, thermometer, ventilation pipe and feeding channel, add 450g of deionized water, add 7.5g of sodium hydroxide and 5.0g of urea under stirring, place on ice Cool in a bath, add 50 g of dry base starch, and stir to obtain a homogeneous starch paste with a weight concentration of 10%;

[0028] (2) Heat up to 70°C under stirring, add 1.5g of oxidizing agent sodium persulfate and 4g of 3-chloro-2-hydroxypropyltriethylammonium chloride, carry out oxidative degradation and cationization, after reacting for 3 hours, A translucent viscous liquid was obtained, and the pH value of the system was adjusted to 7.5 with hydrochloric acid;

[0029] (3) Nitrogen was added, 56g of acrylamide, 2g of acrylic acid, 7g of acryloyloxyethyltrimethylammonium chloride, 3g of methyl acrylate and 3.4g of initiator ammonium persulfate were added, and the temperature was raised to 90°C for 2 hours of reaction. Cool...

Embodiment 3

[0031] (1) Activation pretreatment of starch: In a four-necked flask equipped with stirring, thermometer, ventilation pipe and feeding channel, add 368g of deionized water, add 3.84g of sodium hydroxide and 2.24g of urea under stirring, place on ice Cool in a bath, add dry base starch 32g, stir to obtain a homogeneous starch paste, the weight concentration is 8%;

[0032] (2) Heat up to 65°C under stirring, add 1.6g of oxidant sodium persulfate and 2.56g of 3-chloro-2-hydroxypropyltrimethylammonium chloride, carry out oxidative degradation and cationization, and react for 2 hours , to obtain a translucent viscous liquid, adjust the pH value of the system to 8.0 with hydrochloric acid

[0033] (3) Nitrogen, add 52g of acrylamide, 3g of acrylic acid, 3g of dimethyldiallyltrimethylammonium chloride, 1.8g of methyl acrylate and 2.4g of initiator ammonium persulfate, and heat up to 85°C to react 2 Hours later, cool to 25°C to obtain the dry strengthening agent, the viscosity is 75...

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Abstract

The invention relates to a dry strength agent and a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out activation pretreatment on starch: adding dry basis starch to mixed aqueous solution of alkalis and urea and stirring and dispersing to obtain starch paste; (2) adding an oxidant and an etherifying agent to carry out oxidative degradation and cationization to obtain semitransparent viscous liquid and using a neutralizing agent to regulate the pH value of the system to 7-8; and (3) introducing nitrogen, adding acrylamide, raising the temperature to 80-90 DEG C after stirring for 30-60 minutes, simultaneously dropwise adding a mixed monomer and an initiator for 15-30 minutes and reacting for 1-2 hours after dropwise adding, thus obtaining the dry strength agent. The prepared dry strength agent is low in cost and is added to the wet parts of the papermaking and the production process is simple. Compared with other kinds of dry strength agents, the dry strength agent can obviously improve the dry strength and tearing strength of the paper and simultaneously has good film-forming property and heat resistance.

Description

technical field [0001] The present invention relates to a dry strengthening agent and its preparation method and application. Background technique [0002] The main raw material for papermaking in my country is straw pulp, and the main problem of paper and cardboard produced with it is that its strength is not high. The currently produced dry strengthening agents are mainly cationic starch, cationic polyacrylamide, amphoteric polyacrylamide and graft copolymer. Due to factors such as the fast speed of the paper machine, the emergence of some special papers and the improvement of printing machinery, the above additives often cannot meet the requirements of dry strength and folding resistance when used alone. Contents of the invention [0003] The purpose of the present invention is to disclose a dry strengthening agent and its preparation method and application, so as to overcome the above-mentioned defects in the prior art. [0004] The preparation method of the dry stre...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/34C08F226/02C08F220/14C08F220/28C08F220/06C08B31/12C08B31/18D21H21/18
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS
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