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Sizing agent, preparation method thereof and paper coated with sizing agent

A sizing agent and catalyst technology, applied in papermaking, coating, paper coating and other directions, can solve the problems of non-degradability, environmental pollution, affecting the water resistance and tensile strength of paper, and achieve improved performance and good water resistance. Effect

Active Publication Date: 2022-06-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the present invention is that the existing sizing agent affects the water resistance and tensile strength of paper, especially because it is not degradable, it will bring serious environmental pollution problems, which does not conform to the current environmental protection policy

Method used

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  • Sizing agent, preparation method thereof and paper coated with sizing agent

Examples

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preparation example Construction

[0022] see figure 1 As shown, a preparation method of a sizing agent according to an embodiment of the present invention includes:

[0023] Step S1, gelatinizing the polyvinyl alcohol (PVA) powder, and cooling to obtain a polyvinyl alcohol solution;

[0024] Step S2, adding 2-hydroxypropionic acid and a catalyst to the polyvinyl alcohol solution under a protective atmosphere, and reacting at 120°C-150°C for 2h-14h to obtain a mixture;

[0025] Step S3, cooling the mixture to 70°C-90°C, adding adipaldehyde, and reacting for 3h-5h to obtain a sizing agent.

[0026] In this example, the PVA powder is gelatinized to obtain a usable polyvinyl alcohol solution, and it is reacted with 2-hydroxypropionic acid (also called lactic acid), so that the lactic acid is grafted onto the PVA chain to improve film formation. The final sizing agent is degradable, has no harm to the environment, and has good water resistance, oxygen barrier properties and tensile strength.

[0027] In some emb...

Embodiment 1

[0035] Disperse 10g of PVA in 90g of water, heat it to 90°C, stir for 30 minutes, after the PVA is completely dissolved, cool it for later use, heat the gelatinized PVA to 60°C, introduce nitrogen, empty the air, and add 1g of 2 -Hydroxypropionic acid, then add 0.03g of catalyst tin dioxide; heat the above mixture to 120°C, react for 2h, after the reaction is over, cool down to 70°C, add 5g of adipaldehyde, react for 3 hours, and discharge after cooling, Get the sizing agent.

Embodiment 2

[0037] Disperse 12g of PVA in 88g of water, heat it to 90°C, stir for 30 minutes, wait until the PVA is completely dissolved, cool it for later use, heat the gelatinized PVA to 60°C, introduce nitrogen, empty the air, and add 2g 2 -Hydroxypropionic acid, then 0.07g catalyst tin dioxide was added; the above mixture was heated to 140°C and reacted for 6h. After the reaction was over, the temperature was lowered to 70°C, 10g of adipaldehyde was added, and the reaction was performed for 4 hours. After cooling, the material was discharged. Get the sizing agent.

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Abstract

The invention provides a sizing agent, a preparation method thereof and paper coated with the sizing agent, and belongs to the technical field of papermaking chemicals. The method comprises the following steps: gelatinizing polyvinyl alcohol (PVA) powder, and cooling to obtain a polyvinyl alcohol solution; adding 2-hydracrylic acid and a catalyst into the polyvinyl alcohol solution in a protective atmosphere, and reacting at 120-150 DEG C for 2-14 hours to obtain a mixture; and cooling the mixture to 70-90 DEG C, adding adipic dialdehyde, and reacting for 3-5 hours to obtain the sizing agent. The gelatinized polyvinyl alcohol solution reacts with 2-hydracrylic acid, lactic acid is grafted to a PVA chain so as to improve the film forming performance, 2-hydracrylic acid which is not completely reacted is removed through a cross-linking reaction of adipic dialdehyde and hydroxyl, and due to the fact that polyvinyl alcohol is a biodegradable material, the finally prepared sizing agent has the degradability, and the film forming performance is improved. The water resistance, the oxygen barrier performance and the tensile strength are good.

Description

technical field [0001] The present invention relates to the technical field of papermaking chemicals, in particular, to a sizing agent, a preparation method thereof, and paper coated with the sizing agent. Background technique [0002] In recent years, China's paper industry has developed strongly. In the paper industry, the application of paper chemicals plays a decisive role in the quality of paper and the runnability of production. Paper chemicals endow paper with various excellent special properties, such as water resistance. , Oil resistance, wet strength, oxygen barrier, smoothness, printability, softness, etc. Papermaking chemicals refer to the general term of various chemicals and auxiliaries used in the papermaking process, including a wide range of papermaking chemicals, such as sizing agents and wet strength agents. [0003] A commonly used surface sizing agent in the prior art is starch, but it is easy to absorb moisture after film formation, which affects the w...

Claims

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Application Information

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IPC IPC(8): C08F8/14C08F16/06D21H19/20D21H21/16D21H21/14
CPCC08F8/14D21H19/20D21H21/16D21H21/14C08F16/06Y02W30/64
Inventor 宋晓明刘翠耿万磊宋胜男孙一文高珊珊张祥斌汤国锋徐功臣王燕
Owner QINGDAO UNIV OF SCI & TECH
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