Waterproof and oil-proof white cardboard and production method thereof

A waterproof and oil-proof, white cardboard technology, applied in the field of papermaking, can solve the problems affecting paper recycling and natural degradation, endangering human health, pulping and pulping difficulties, etc., to improve surface smoothness and gloss, improve Surface properties, effects of migration avoidance

Pending Publication Date: 2022-05-10
湛江晨鸣浆纸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When paper needs to be waterproof and oil-proof, the commonly used method is to coat a layer of polymer film on its surface in the form of a coating, or to apply an oil-repellent agent. The former is difficult to break down and degrade due to the polymer film, which will cause the paper material to recycle. It is difficult to pulp and pulp after use, which affects the recycling and natural degradation of pape

Method used

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  • Waterproof and oil-proof white cardboard and production method thereof
  • Waterproof and oil-proof white cardboard and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] A waterproof and oil-proof white cardboard with a basis weight of 250g / m. 2 Such as Figure 1 As shown, it comprises a surface layer 1, a core layer 2 and a bottom layer 3 which are laminated in sequence, wherein the surface layer 1 is coated with a precoat layer 5, a core layer 6 and a top layer 7 from inside to outside, the bottom layer 3 is coated with a primer layer 9, and the primer layer is also coated with a waterproof and oil-proof coating (corresponding Figure 1 Middle waterproof and oil-proof coating layer 10), the slurry of the surface layer, the core layer and the bottom layer are all added with in-slurry sizing agent, and the surface layer sizing agent (corresponding Figure 1 The middle surface layer sizing layer 4), and the bottom layer sizing agent (corresponding Figure 1 Middle bottom sizing layer 8).

[0030] The pulp of the surface layer 1 is the combination of NBKP pulp and LBKP pulp, the pulp of the core layer 2 is the combination of NB...

Example Embodiment

[0049] Example 2

[0050] The structure, basis weight and papermaking process of white paperboard base paper are the same as those of Example 1, which comes from the same wet-end papermaking production line, and the processes and formulas of surface sizing, precoating, core coating and top coating are the same, with the difference that:

[0051] The primer coating comprises the following components in parts by weight: 100 parts of filler, 7 parts of carboxylated styrene-butadiene latex, 5 parts of biological latex, 2 parts of soybean protein isolate, 0.1 part of water-repellent agent, 0.03 part of dispersant, 0.2 part of lubricant, 0.4 part of CMC, 1.0 part of OBA whitening agent, 0.0015 part of coated blue and a proper amount of defoamer.

[0052] The waterproof and oil-proof coating comprises the following components in parts by mass: 35 parts of nitrile latex, 18 parts of silicone-acrylic emulsion, 25 parts of oxidized starch, 8 parts of paraffin emulsion, 1.5 parts of CMC, sta...

Example Embodiment

[0053] Example 3

[0054] Same as the rest of Example 1, except that:

[0055] The primer coating comprises the following components in parts by weight: 100 parts of filler, 8 parts of carboxylated styrene-butadiene latex, 4 parts of biological latex, 1.5 parts of soybean protein isolate, 0.12 parts of water-repellent agent, 0.03 parts of dispersant, 0.15 parts of lubricant, 0.3 parts of CMC, 1.0 parts of OBA whitening agent, 0.015 parts of coated blue and a proper amount of defoamer.

[0056] The waterproof and oil-proof coating comprises the following components in parts by mass: 35 parts of nitrile latex, 15 parts of silicone-acrylic emulsion, 30 parts of oxidized starch, 7 parts of paraffin emulsion, 1.5 parts of CMC, starch cross-linking agent, preservative and proper amount of defoamer. The dosage of starch cross-linking agent is 0.18% of the weight of oxidized starch, and the starch cross-linking agent is sodium trimetaphosphate.

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PUM

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Abstract

The waterproof and oil-proof white cardboard comprises a surface layer, a core layer and a bottom layer, the bottom layer is sequentially coated with a bottom coating and a waterproof and oil-proof coating, slurry is subjected to internal sizing firstly, surface sizing is conducted on the surface layer and the bottom layer, and then the surface layer and the bottom layer are subjected to surface sizing; the waterproof and oil-proof coating is prepared from 30 to 40 parts of butyronitrile latex, 10 to 20 parts of silicone acrylic emulsion, 20 to 30 parts of oxidized starch, a starch cross-linking agent, 5 to 10 parts of paraffin emulsion, 0.5 to 2 parts of CMC (Carboxymethyl Cellulose), a preservative and a defoaming agent; the coating of the bottom coating comprises 100 parts of filler, 5-8 parts of carboxylic butadiene-styrene latex, 3-6 parts of biological latex, 1-4 parts of soybean protein isolate, 0.08-0.2 part of a water repellent agent and the like; the bottom layer sizing agent comprises 100 parts of enzyme modified starch and 8-13 parts of polyvinyl alcohol. The back surface of the white cardboard has excellent water resistance and oil resistance, the whiteness and smoothness of the back surface are improved, the overall stiffness of the white cardboard is improved, and the white cardboard is low in cost and relatively environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a waterproof and oil-proof white cardboard and a production method thereof. Background technique [0002] White cardboard can be used as a packaging material to package a variety of items, including food. When used in food packaging, it is often required that the side in contact with food be waterproof and oil-proof. The side of white cardboard in contact with food is generally the back side, and the front side is used for printing patterns. . The front of ordinary white cardboard will be coated to make the paper have a certain surface strength and printability, which is convenient for printing. The back is often not coated or conventionally coated to improve whiteness and surface strength or reduce costs. When paper needs to be waterproof and oil-proof, the commonly used method is to coat a layer of polymer film on its surface in the form of a coating, or to apply an oil-re...

Claims

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Application Information

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IPC IPC(8): D21H27/30D21H27/10D21H19/82D21H19/84D21H21/14D21H21/16D21H19/14D21H19/18D21H19/20D21H19/32D21H21/36D21H11/04D21H11/02D21H19/38D21H19/58D21H19/44D21H19/50D21H19/52D21H21/30D21H19/60D21H19/46B32B29/00B32B33/00B32B37/00
CPCD21H27/30D21H27/10D21H19/82D21H19/84D21H21/14D21H21/16D21H19/14D21H19/18D21H19/20D21H19/32D21H21/36D21H11/04D21H11/02D21H19/385D21H19/58D21H19/44D21H19/50D21H19/52D21H21/30D21H19/60D21H19/46B32B29/005B32B33/00B32B37/00B32B2037/243B32B2255/28B32B2255/12B32B2255/26B32B2307/7265B32B2307/406B32B2307/746B32B2439/70Y02W90/10
Inventor 李金伟陈磊马禄润雷丽丽范景村
Owner 湛江晨鸣浆纸有限公司
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