A kind of high-efficiency surface sizing agent and preparation method thereof

A kind of surface sizing agent, high-efficiency technology, applied in the direction of adding water repellent, coating, paper coating, etc., can solve the problems of small increase of corrugated paper ring compressive strength, unstable paper quality, large amount of sizing agent, etc. Effect of surface strength improvement, Cobb value improvement, and surface strength improvement

Active Publication Date: 2018-03-13
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high
[0005] 3) Due to the many variable factors of internal sizing, the paper quality is unstable and the grade is difficult to improve, which makes manufacturers use less or give up internal sizing and use surface sizing to make up for it has become a popular trend
[0007] However, although the current surface sizing agent can improve the ring compressive strength of corrugated paper, the amount of sizing agent is large and the cost is high.
[0008] A sizing agent disclosed in Chinese patent CN201210136214.2, although the curing speed is fast and does not return to moisture, the ring compressive strength of corrugated paper is not greatly improved

Method used

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  • A kind of high-efficiency surface sizing agent and preparation method thereof
  • A kind of high-efficiency surface sizing agent and preparation method thereof

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preparation example Construction

[0035] The invention provides a kind of preparation method of high-efficiency surface sizing agent, comprises the following steps:

[0036] Step 1, uniformly mixing methylstyrene, acrylate monomers, crosslinking monomers, cationic monomers and initiators to form mixed monomers;

[0037] Step 2: Add 10-20% of the mixed monomers obtained in step 1 to the four-necked flask, raise the temperature to 80-140°C, add the remaining mixed monomers dropwise after reacting for 5-20 minutes, and then keep warm at 80-140°C for 0.5 -1.5 hours;

[0038] Step 3, adding acetic acid, reacting at 80-140°C for 20-60 minutes;

[0039] Step 4, adding deionized water preheated at 80-100°C, continuing to react for 0.5-2 hours, cooling, and filtering to obtain a high-efficiency surface sizing agent.

Embodiment 1

[0042] Preparation of surface sizing agent:

[0043] A) Mix 100 grams of styrene, 20 grams of n-butyl acrylate, 20 grams of N,N-dimethylaminoethyl acrylate, and 0.3 grams of dibenzoyl peroxide, and set aside.

[0044] B) Heat 161.47 g of deionized water to 80°C and set aside.

[0045] C) Add 10% of the mixed monomer in step A) to a four-neck flask equipped with a condenser, dropping device, stirrer, and thermometer, raise the temperature to 80°C, and add dropwise the remaining The mixed monomers were added dropwise for 5 hours. After the dropwise addition, the heat preservation was continued at 80°C for 1 hour, and then 10 g of acetic acid was added. After reacting at 80°C for 1 hour, the hot water in step B) was added, reacted for 1 hour, and cooled to 35 °C, pH=1.09. After filtering through a 100-mesh filter screen, the obtained surface sizing agent had a solid content of 44.89wt%.

Embodiment 2

[0047] Preparation of surface sizing agent:

[0048] A) Mix 100 grams of methyl styrene, 100 grams of isooctyl acrylate, 100 grams of methacrylamidopropyl dimethylamine, 10 grams of aminoethyl acrylate, and 5 grams of tert-butyl peroxybenzoate, and set aside .

[0049] B) Heat 1783 grams of deionized water to 100°C and set aside.

[0050] C) Add 20% of the mixed monomers in step A) to a four-neck flask equipped with a condenser, dropping device, stirrer, and thermometer, raise the temperature to 140°C, add, and add step A) dropwise after 10 minutes of reaction Add the remaining mixed monomer in the mixture for 1 hour. After the dropwise addition, continue to keep warm at 140°C for 0.5 hour, then add 2 grams of acetic acid, react at 140°C for 20 minutes, add the hot water in step B), and cool down to 95°C for reaction After 30 minutes, cool to 25°C, pH=5.85. After filtering through a 100-mesh filter screen, the obtained surface sizing agent had a solid content of 15.13wt%. ...

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Abstract

The invention discloses a preparation method of a high-efficiency surface sizing agent, which comprises the following steps: step 1, uniformly mixing methylstyrene, acrylate monomers, crosslinking monomers, cationic monomers and initiators to form a mixed unit body; step 2, add 10-20% of the mixed monomer obtained in step 1 to the four-necked flask, heat up to 80-140°C, and add the remaining mixed monomer dropwise after reacting for 5-20 minutes, then 80-140°C Keep warm for 0.5-1.5 hours; step 3, add acetic acid, react at 80-140°C for 20-60 minutes; step 4, add 80-100°C preheated deionized water, continue to react for 0.5-2 hours, cool, filter, and obtain high-efficiency Surface sizing agent. The high-efficiency surface sizing agent of the present invention not only can greatly reduce the Cobb value, can quickly ripen, and can be cooked almost immediately after leaving the machine, but also can greatly improve the surface strength of the cardboard base paper under the condition that the amount of the sizing agent remains unchanged.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a preparation method of a high-efficiency surface sizing agent. Background technique [0002] The development trend of paper, especially corrugated paper and cardboard is as follows: [0003] 1) It is developing from high grammage to low grammage. [0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high. [0005] 3) Due to the unstable quality of paper caused by many variable factors in internal sizing, and the difficulty of improving the grade, it has become a popular trend for manufacturers to use less or give up internal sizing and use surface sizing to make up for it. [0006] Requirements for the sizing agent used for the above-mentioned surface sizing: a) increase the ring compressive strength; b) greatly reduce the Cobb value (water absorption value); [0007] However, although the current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H19/20C08F212/08C08F220/18C08F220/34C08F212/12C08F220/60C08F220/32C08F220/14
CPCD21H19/20D21H21/16C08F212/08C08F212/12C08F220/1808C08F220/60C08F220/34C08F220/1804C08F220/14C08F220/1802C08F220/325
Inventor 施晓旦尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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