Novel surface sizing agent and preparation method thereof

A surface sizing agent, a new type of technology, applied in the direction of water repellent addition, coating, paper coating, etc., can solve the problems of large amount of sizing agent, difficult to improve the grade, high cost, etc., to improve the surface ring pressure strength, improve Cobb value, Cobb value reduction effect

Active Publication Date: 2017-02-01
SHANGHAI DONGSHENG NEW MATERIALS
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  • Abstract
  • Description
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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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  • Novel surface sizing agent and preparation method thereof

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preparation example Construction

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

[0036] Step 1, uniformly mixing methylstyrene, acrylate monomer, cationic monomer and initiator to form a mixed monomer;

[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: add deionized water preheated at 80-100°C, continue to react for 0.5-2 hours, add siloxane to react for 0.5-3 hours, cool, and filter to obtain a new 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=1.11. After filtering through a 100-mesh filter screen, the obtained surface sizing agent had a solid content of 44.95wt%.

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, 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, keep the temperature at 140°C for 0.5 hour, then add 2 g of acetic acid, react at 140°C for 20 minutes, add the hot water in step B), and cool down to 95°C. Add 10 g of vinyltriethoxysilane to react for 30 minutes, cool to 25°C, pH=5.78. After filtering through a 100-mesh filter screen, the obtained surface sizing agent had a solid content of 15.17wt%.

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Abstract

The invention discloses a novel surface sizing agent and a preparation method thereof. The preparation method comprises the following steps: 1, uniformly mixing methyl styrene, an acrylate monomer, a cationic monomer and an initiator to form a mixed monomer; 2, adding 10-20% of the mixed monomer obtained in the step 1 into a four-necked flask, heating to the temperature of 80-140 DEG C, reacting for 5-20 minutes, and dripping the residual mixed monomer; 3, adding acetic acid, and reacting at the temperature of 80-140 DEG C for 20-60 minutes; 4, adding preheated deionized water at the temperature of 80-140 DEG C, continuously reacting for 0.5-2 hours, adding siloxane for reacting 0.5-3 hours, cooling, and filtering, thereby obtaining the novel surface sizing agent. The novel surface sizing agent disclosed by the invention is capable of greatly reducing a Cobb value, promoting rapid curing, and greatly improving the ring crush compression resistance of corrugated paper and reducing gram weight of paper on the premise of maintaining invariable sizing agent amount.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a novel surface sizing agent and a preparation method thereof. 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 s...

Claims

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Application Information

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