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Preparation method for dampproof quick-drying surface sizing agent

A surface sizing agent and quick-drying technology, applied in the direction of water repellent addition, etc., can solve the problems of unfavorable strength and performance of sizing paper, easy moisture return, and easy stickiness of the film layer, so as to shorten the drying time and improve the environmental protection. Effect of improving compressive strength and surface strength and bonding strength

Inactive Publication Date: 2017-08-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: the existing surface sizing agent is easy to foam when sizing, which will adversely affect the strength performance of the sized paper, and there are large dosage and slow drying speed in the sizing process, The formed film layer is easy to be sticky and prone to the defects of moisture return. It provides a kind of chitosan as raw material, which is partially hydrolyzed by alkali bubbles, then carboxymethylated to increase active groups, and then reacted with stearic acid to enhance hydrophobicity and improve film-forming viscosity stability, and then introduce siloxane and organic bismuth to increase the drying speed to prepare a moisture-proof and quick-drying surface sizing agent. In the present invention, chitosan is first added to sodium hydroxide solution for soaking and swelling, and then chlorine is added Acetic acid solution was stirred and reacted, the product was collected and suction filtered to obtain a filter cake, the filter cake was washed to obtain carboxymethyl chitosan, then stearic acid, silane coupling agent, etc. Based chitosan, water heating reaction, the collected product is rotary steamed and then heated and reacted with polydimethylsiloxane, polyethylene glycol, etc., and finally cooled naturally to obtain a moisture-proof and quick-drying surface sizing agent, which is prepared in the present invention The moisture-proof and quick-drying surface sizing agent has the advantages of good sizing effect, good moisture-proof performance, and fast drying speed. It can effectively improve the strength properties of the paper after sizing, and improve the moisture-proof and water-resistant capabilities of the paper. Prospect of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First weigh 30g of chitosan and add it to a beaker containing 200mL of 10% sodium hydroxide solution, and heat it to 70°C. After soaking and swelling for 4 hours, an alkalized chitosan gel is obtained, and the alkalized chitosan gel is obtained. The sugar gel is placed in a three-necked flask with a thermometer and a reflux device, and the flask is placed in an ice-water bath, and the temperature is controlled at 0 ° C. Then, 25 mL of a chloroacetic acid solution with a mass fraction of 25% is added dropwise to the flask to control the rate of addition. 5mL / min, after the dropwise addition is completed, stir and react for 2h. After the reaction is over, collect the product and place it in a Buchner funnel for suction filtration, collect the filter cake, wash the filter cake 3 times with a mass fraction of 75% ethanol solution to obtain carboxymethyl Chitosan-based chitosan, set aside; then weigh 5g of stearic acid, 1g of silane coupling agent KH-550 and 0.3g of N-hydroxy...

example 2

[0019]First weigh 35g chitosan and add it into a beaker containing 250mL mass fraction of 10% sodium hydroxide solution, and heat it to 75°C. After soaking and swelling for 4 hours, an alkalized chitosan gel is obtained, and the alkalized chitosan gel is obtained. The sugar gel is placed in a three-necked flask with a thermometer and a reflux device, the flask is placed in an ice-water bath, and the temperature is controlled at 3°C, and then 28mL of chloroacetic acid solution with a mass fraction of 25% is added dropwise to the flask to control the rate of addition. 7mL / min, after the dropwise addition is completed, stir and react for 2h, when the reaction is over, collect the product and place it in a Buchner funnel for suction filtration, collect the filter cake, wash the filter cake 4 times with a mass fraction of 75% ethanol solution to obtain carboxymethyl Chitosan-based chitosan, set aside; then weigh 7g stearic acid, 2g silane coupling agent KH-550 and 0.4g N-hydroxysucc...

example 3

[0022] First weigh 40g of chitosan and add it to a beaker containing 300mL of 10% sodium hydroxide solution, and heat it to 80°C. After soaking and swelling for 5 hours, an alkalized chitosan gel is obtained. The sugar gel is placed in a three-necked flask with a thermometer and a reflux device, the flask is placed in an ice-water bath, and the temperature is controlled at 5°C, and then 30mL of a mass fraction of 25% chloroacetic acid solution is added dropwise to the flask to control the rate of addition. 8mL / min, after the dropwise addition is completed, stir and react for 3h, when the reaction is over, collect the product and place it in a Buchner funnel for suction filtration, collect the filter cake, wash the filter cake 5 times with a mass fraction of 75% ethanol solution to obtain carboxymethyl Chitosan-based chitosan, set aside; then weigh 8g stearic acid, 3g silane coupling agent KH-550 and 0.5g N-hydroxysuccinimide and add them to a beaker filled with 100mL absolute e...

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Abstract

The invention discloses a preparation method of a moisture-proof and quick-drying surface sizing agent, which belongs to the technical field of papermaking auxiliary preparation. In the present invention, chitosan is firstly added to sodium hydroxide solution to soak and swell, then chloroacetic acid solution is added to stir and react, the product is collected and filtered by suction to obtain a filter cake, and the filter cake is washed to obtain carboxymethyl chitosan, and then stearic acid , silane coupling agent, etc., and anhydrous ethanol are stirred to obtain a mixed solution, which is heated and reacted with carboxymethyl chitosan and water, and the product is collected and then heated and reacted with polydimethylsiloxane, polyethylene glycol, etc. , and finally cool naturally to get the moisture-proof and quick-drying surface sizing agent. The moisture-proof and quick-drying surface sizing agent prepared by the present invention has the advantages of good sizing effect, good moisture-proof performance, and fast drying speed, and can effectively improve the sizing effect. The various strength properties of the final paper can be improved, and the moisture-proof and water-resistant capabilities of the paper can be improved, which has a good application prospect.

Description

technical field [0001] The invention discloses a preparation method of a moisture-proof and quick-drying surface sizing agent, which belongs to the technical field of papermaking auxiliary preparation. Background technique [0002] In addition to special papers such as toilet paper, filter paper and cigarette paper, about 80% of papers need to be added to the pulp or coated with some water-resistant substances on the surface of the paper, so that the paper has the property of delaying fluid penetration to achieve ink resistance (such as Writing paper), anti-oil (such as food packaging paper), etc., this process is called sizing, and the added substance is called sizing agent. Paper chemicals are widely used in paper pulping, wet end, surface sizing, coating and wastewater treatment. Among them, surface sizing is a process in the paper processing process. By spraying a layer of glue on the paper, a layer of nearly continuous film is formed, so as to achieve the purpose of ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16C08B37/08
CPCD21H21/16C08B37/003
Inventor 陈兴权王维孙冬林晨
Owner CHANGZHOU UNIV
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