Preparation and application method of water-tolerant paper surface sizing agent

A surface sizing agent and surface sizing technology, applied in the direction of water repellent addition, etc., can solve the problems of low storage stability of sizing liquid, large emulsion particle size, weak binding force, etc., and achieve the reduction of Cobb value, particle size, etc. The effect of low diameter and improved binding force

Inactive Publication Date: 2019-04-05
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using starch as a dispersant, the storage stability of the sizing solution is not high, and compared with polymer emulsifiers, it has weaker binding force with pulp fibe

Method used

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  • Preparation and application method of water-tolerant paper surface sizing agent
  • Preparation and application method of water-tolerant paper surface sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] Preparation of water-resistant surface sizing agent:

[0033] 8 g polyvinyl alcohol, 180 g mixed monomers (100 g styrene, 80 g ethyl acrylate), and 100 g deionized water were mixed together, and stirred at 500 rpm for 30 minutes to form a stable emulsion. Add 350 g of deionized water and 2 g of polyvinyl alcohol into a four-necked flask and raise the temperature to 80° C., and add 0.3 g of ammonium persulfate. After reacting for 10 minutes, the aforementioned emulsion was slowly added dropwise, and the dropwise addition was completed for 1.5 hours. While adding the monomers, 0.7 g of ammonium persulfate and 50 g of deionized aqueous solution were added dropwise, and the dropping was completed in 2 hours. After the addition is complete, the reaction is continued for 1 hr. After cooling, it was filtered through a 325-mesh filter to obtain a surface sizing agent with pH=3.5 and solid content=27.1%.

Example Embodiment

[0034] Example 2

[0035] Preparation of water-resistant surface sizing agent:

[0036] 16 g of octadecyl polyoxyethylene (10) ether, 200 g of mixed monomers (100 g of styrene, 100 g of butyl acrylate), and 150 g of deionized water were mixed together and stirred at 600 rpm for 30 minutes to form a stable emulsion. 400 grams of deionized water and 4 grams of octadecyl polyoxyethylene (10) ether were put into a four-neck flask and the temperature was raised to 85° C., and 0.3 g of potassium persulfate was added. After 10 minutes of reaction, the aforementioned emulsion was slowly added dropwise, and the dropwise addition was completed for 1.5 hours. While adding the monomers, 0.7 g of potassium persulfate and 50 g of deionized aqueous solution were added dropwise for 2 hours. After the addition is complete, the reaction is continued for 1 hr. After cooling, it was filtered through a 325-mesh filter to obtain a surface sizing agent with pH=3.35 and solid content=26.0%.

Example Embodiment

[0037] Example 3

[0038] Preparation of water-resistant surface sizing agent:

[0039] 32 g of polyvinylpyrrolidone, 180 g of mixed monomers (100 g of styrene, 80 g of isooctyl acrylate), and 150 g of deionized water were mixed together and stirred at 600 rpm for 40 minutes to form a stable emulsion. 310 grams of deionized water and 8 grams of polyvinylpyrrolidone were put into a four-necked flask and the temperature was raised to 90°C, and 0.9g of tert-butyl peroxybenzoate was added. After 15 minutes of reaction, the aforementioned emulsion was slowly added dropwise, and the dropwise addition was completed for 1.5 hours. While dropping the monomer, 2.1 g of tert-butyl peroxybenzoate and 50 g of deionized aqueous solution were added dropwise, and the dropping was finished in 2 hours. After the addition is complete, the reaction is continued for 1 hr. After cooling, it was filtered through a 325-mesh filter to obtain a surface sizing agent with pH=3.39 and solid content=29.8%.

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Abstract

The invention discloses a preparation method of a water-tolerant paper surface sizing agent. The method comprises intensely mixing a part of high-polymer emulsifier, (methyl) styrene, (methyl) acrylate mixed monomers and deionized water to prepare an emulsion; heating the other part of the high-polymer emulsifier and water inside a container to 80-90 DEG C, then adding in initiator for reaction for 10-20 min, dropwise adding in the prepared emulsion for 1.5-3.0 hr for continuous reaction for 1.0-2.0 hr, and performing cooling and discharging. The invention also relates to the water-tolerant paper surface sizing agent prepared through the method and application of the prepared water-tolerant paper surface sizing agent. According to the preparation method of the water-tolerant paper surfacesizing agent, styrene acrylate emulsion is prepared by polymerizing soap-free emulsion and monomers are dropwise added through monomer emulsification, so that bonding between the styrene acrylate emulsion and the surface of paper can be enhanced. When the water-tolerant paper surface sizing agent is applied to the surface of the paper, the applied paper can have the advantage of high water tolerance; due to the fact that no micromolecular emulsifier is applied during polymerization, the water-tolerant paper surface sizing agent is an environment friendly product.

Description

technical field [0001] The invention relates to the field of papermaking surface sizing agents, in particular to a preparation method and application of a paper surface sizing agent with strong water resistance. Background technique [0002] Surface sizing agent is a sizing agent applied on the surface of paper or cardboard. Its addition can improve the performance of paper or increase the surface properties, strength and water resistance of paper or cardboard. [0003] With the improvement of living standards, people's requirements for paper quality are getting higher and higher. At the same time, the development of society has more and more stringent requirements for the papermaking environment. Therefore, higher requirements are put forward for the development and application of related papermaking chemicals. . Most surface sizing agents are mainly composed of two parts: a hydrophobic group that is resistant to water and a hydrophilic group that has an affinity for pulp....

Claims

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Application Information

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IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 施晓旦谢中怡尹东华金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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