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Method for preparing hydrophobic paper

A paper and hydrophobic technology, which is applied in papermaking, paper coating, physical treatment of paper, etc., can solve the problems of low melting point and limited temperature range of hydrophobic paper, and achieve the effects of simplified processing technology, low price and environmental friendliness

Active Publication Date: 2014-10-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the wax used in this patent document has a low melting point, which limits the use temperature range of the hydrophobic paper. Although it has been higher than the use temperature disclosed in the above patent document, it is generally lower than 80°C

Method used

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  • Method for preparing hydrophobic paper
  • Method for preparing hydrophobic paper
  • Method for preparing hydrophobic paper

Examples

Experimental program
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Effect test

Embodiment 1

[0045] First add WPP (industrial grade, Jiangyin Jiuli Plastic Industry Co., Ltd.) and toluene into a four-necked flask with a stirring and reflux device at a mass ratio of 1:3, heat at 115±5°C, and fully dissolve to obtain a WPP solution. Then, at 90±2°C, the initiator 2.5wt% BPO was dissolved in toluene to obtain a BPO toluene solution, which was then added dropwise into the WPP solution. Then, methacrylic acid (MAA) mixed with toluene at a mass ratio of 1:1 to WPP was added dropwise into a four-necked flask, and the constant temperature reaction was continued for 2 hours to obtain a MWPP solution. The Span80 (pharmaceutical grade, Shanghai Jingchun Industrial Co., Ltd.) of 5wt% is joined in the MWPP mixed solution; In another four-necked flask with stirrer, add water, 10wt% Tween20 (chemically pure, Wenzhou Qingming Chemical Industry Co., Ltd. Co., Ltd.) and 4wt% organic amine, heated to 90±5°C. Slowly add the MWPP solution into the aqueous solution, and stir rapidly. Afte...

Embodiment 2

[0047] Similar to the method in Example 1, the difference is that the mass ratio of MAA to WPP is 1.1:1, and the obtained hydrophobic paper is measured by a contact angle tester, and the surface water contact angle of the hydrophobic paper is 117±1°.

Embodiment 3

[0049] Similar to the method in Example 1, the difference is that the mass ratio of MAA to WPP is 1.2:1, and the obtained hydrophobic paper is measured by a contact angle tester, and the surface water contact angle of the hydrophobic paper is 115±2°.

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Abstract

The invention discloses a method for preparing hydrophobic paper. The method comprises the following steps: firstly, grafting active monomer onto polyolefin through free radical polymerization reaction to obtain modified polyolefin; emulsifying the modified polyolefin to obtain modified polyolefin emulsion; finally uniformly mixing the modified polyolefin emulsion with paper coating to obtain composite emulsion, coating the paper by using the composite emulsion and drying to obtain the hydrophobic paper. The method disclosed by the invention has the advantages that on the premise that the existing paper producing processes are not changed, the hydrophobicity of the paper is increased; the using temperature range of the paper is broadened; the method is low in cost and good in controllability; the obtained paper is free of fluorosilicone chemical, easy and convenient in recovery processing and friendly to environment.

Description

technical field [0001] The invention relates to the technical field of paper processing, in particular to a method for preparing hydrophobic paper. Background technique [0002] Paper is widely used in the fields of industry, agriculture, culture, and packaging. Food paper packaging is easy to be damp and cause food deterioration; after the packaging carton is taken out of the freezer and returned to normal temperature, it is easy to be infiltrated by water, which makes the compressive strength and The bursting strength is greatly reduced, so the development of hydrophobic paper is an important direction to improve the competitiveness of the paper industry. The main factors affecting the wettability of solid surfaces are surface free energy and surface roughness. The introduction of low surface energy components and the construction of a certain rough structure are one of the effective methods to prepare hydrophobic surfaces. [0003] The traditional paper waterproof treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/10D21H19/22D21H25/04C08F251/00
Inventor 王德海肖圣威杜治波
Owner ZHEJIANG UNIV OF TECH
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