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A kind of surface sizing agent and preparation method thereof

A technology of surface sizing agent and initiator, which is applied in the field of surface sizing agent and its preparation, can solve the problems of high water absorption value, difficult to improve the grade, and large amount of sizing agent, so as to improve the fiber compactness and improve the Cobb value , Strengthen the effect of cross-linking degree

Active Publication Date: 2018-01-05
SHANGHAI DONGSHENG NEW MATERIALS
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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.
A sizing agent disclosed in Chinese patent CN201210136214.2, although the curing speed is fast and does not return to moisture, the ring compression strength of corrugated paper is not greatly improved

Method used

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  • A kind of surface sizing agent and preparation method thereof
  • A kind of surface sizing agent and preparation method thereof

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preparation example Construction

[0034] The invention provides a kind of preparation method of surface sizing agent, it is characterized in that, comprises the following steps:

[0035] Step 1, uniformly mixing methylstyrene, acrylate monomer, cationic monomer and initiator to form a mixed monomer;

[0036] Step 2, add 10% of the mixed monomer obtained in step 1 to the four-necked flask, raise the temperature to 80-140°C, react for 5-20 minutes, add the remaining mixed monomer dropwise, and then keep warm at 80-140°C for 0.5-1.5 Hour;

[0037] Step 3, adding acetic acid, reacting at 80-140°C for 20-60 minutes;

[0038] Step 4: add deionized water preheated at 80-100°C, continue to react for 0.5-2 hours, cool to 25-35°C, add zirconium salt, stir evenly, and filter to obtain a surface sizing agent.

Embodiment 1

[0041] Preparation of surface sizing agent:

[0042] 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.

[0043] B) Heat 161.47 g of deionized water to 80°C and set aside.

[0044] 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=1.13. After filtering through a 100-mesh filter screen, the obtained surface sizing agent had a solid content of 44.93wt%.

Embodiment 2

[0046] Preparation of surface sizing agent:

[0047] 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.

[0048] B) Heat 1783 grams of deionized water to 100°C and set aside.

[0049] 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, add 10 grams of zirconium carbonate, stir evenly, pH=5.98. After filtering through a 100-mesh filter screen, the obtained surface sizing agent had a solid content...

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Abstract

The invention discloses a preparation method of a surface sizing agent. The preparation method comprises the following steps that firstly, methyl styrene, acrylic monomers, cationic monomers and an initiating agent are mixed to be uniform to form a mixed monomer; secondly, 10% of the mixed monomer obtained in the first step is added into a four-opening flask, the temperature is raised to 80-140 DEG C, residual mixed monomer is added dropwise after a reaction is carried out for 5-20 minutes, and then the temperature of 80-140 DEG C is kept for 0.5-1.5 hours; thirdly, acetic acid is added, and at the temperature of 80-140 DEG C, a reaction is carried out for 20-60 minutes; fourthly, preheated deionized water with the temperature being 80-100 DEG C is added, a reaction continues to be carried out for 0.5-2 hours, and the mixture is cooled to 25-35 DEG C, zircon salt is added, the mixture is stirred to be uniform, filtering is carried out, and the surface sizing agent is obtained. According to the surface sizing agent, the Cobb value can be greatly reduced, the surface sizing agent can be quickly cured and is basically cured as soon as the surface sizing agent is loaded to a machine, and the surface strength of body paper can be greatly improved under the situation that the dosage of the sizing agent is not changed.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a surface sizing agent and a preparation method thereof. Background technique [0002] The development trend and related problems of paper, especially corrugated paper and cardboard are manifested in: [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, alt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H17/66
CPCD21H17/66D21H21/16
Inventor 施晓旦尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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