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Surface Sizing Agent and Its Application

A surface sizing agent, carboxymethyl chitosan technology, applied in the direction of adding water repellent, no pigment coating, coating, etc., can solve the problem of poor compatibility with fluorescent whitening agent, fluorescent whitening agent Low retention rate, affecting the whitening effect, etc., to achieve the effect of unique formula, reduce production cost, and improve utilization rate

Active Publication Date: 2015-10-21
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The retention rate of adding fluorescent whitening agent in the pulp is low, generally only about 30%, the effect is poor, the dosage is large, and it will be lost to the white water, which will cause harm to the environment
[0008] The retention rate of the fluorescent whitening agent added to the surface sizing is close to 100%, but the general surface sizing agent is not compatible with the fluorescent whitening agent. After mixing with the fluorescent whitening agent, it will affect the whitening effect and affect the application. glue effect

Method used

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  • Surface Sizing Agent and Its Application
  • Surface Sizing Agent and Its Application
  • Surface Sizing Agent and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1.1 Preparation of surface sizing agent

[0023] In reactor, add carboxymethyl chitosan 30%, solid content is 55% of olefin copolymer emulsion of 25%, sodium carboxymethyl cellulose 10%, potassium persulfate 5%, add water after reaction and adjust solid content to be 20%.

[0024] 1.2 Experimental conditions

[0025] Experimental equipment: 0-200g balance, 1-100℃ constant temperature water bath, electric stirring, laboratory small sizing machine, Cooper surface absorption weight tester;

[0026] Surface sizing starch: sizing oxidized starch;

[0027] Surface sizing paper: electrostatic copy paper, quantitative 70g / m 2 ;

[0028] Surface sizing agent: the surface sizing agent prepared in Example 1;

[0029] Comparative sample: the surface sizing agent disclosed in Example 1 of Chinese Patent CN1749480A.

[0030] 1.3 Experimental process: Stir the oxidized starch for sizing and raise the temperature to 90-95°C, the concentration of oxidized starch is 10%, heat it fo...

Embodiment 2

[0036] 2.1 Preparation of a new type of surface sizing agent that can effectively reduce the amount of fluorescent whitening agent in pulp

[0037] In reactor, add carboxymethyl chitosan 40%, solid content is 58% of olefin copolymer emulsion of 30%, sodium carboxymethyl cellulose 1%, potassium persulfate 1%, add water after reaction and adjust solid content to be 20%.

[0038] 2.2 Experimental conditions

[0039] Paper machine type: 7280 fourdrinier paper machine;

[0040] Paper machine speed: 1230m / min;

[0041] Test paper type: 75g / m 2 double-adhesive paper;

[0042] Paper machine output: 41.00t / h;

[0043] Experimental sample: the surface sizing agent prepared in embodiment 2

[0044] Comparative sample: the sizing agent disclosed in the embodiment of Chinese patent CN101575322A and the AKD improved synergist 2508 mixed sizing agent produced by Shouguang Zhonghui Chemical Technology Co., Ltd.

[0045] 2.3 Experimental process:

[0046] Original process: internal pul...

Embodiment 3

[0053] 3.1 Preparation of surface sizing agent

[0054] In reactor, add carboxymethyl chitosan 35%, solid content is 30% olefin copolymer emulsion 57%, sodium carboxymethyl cellulose 5%, potassium persulfate 3%, add water after the reaction and adjust solid content to be 20%.

[0055] 3.2 Experimental conditions

[0056] Paper machine type: 1760 fourdrinier paper machine;

[0057] Paper machine speed: 172m / min;

[0058] Test paper type: 80g / m 2 xerographic copy paper;

[0059] Paper machine output: 25 tons / day;

[0060] Experimental sample: embodiment 3 surface sizing agent

[0061] Comparative sample: the sizing agent disclosed in the embodiment of Chinese patent CN101575322A and the AKD improved synergist 2508 mixed sizing agent produced by Shouguang Zhonghui Chemical Technology Co., Ltd.

[0062] 3.3 Experimental process

[0063] The original process: sizing agent AKD in the pulp, the dosage is 15kg / t paper, the dosage of surface sizing agent is 4kg / t paper; the amo...

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Abstract

The invention discloses a surface sizing agent, which comprises the following components by weight: 30%-40% of carboxymethyl chitosan, 55%-58% of an olefin copolymer emulsion, 1%-10% of sodium carboxymethylcellulose, and 1%-5% of potassium persulfate. By applying the surface sizing agent provided in the invention to papermaking coating, after a fluorescent whitening agent is added to the surface, the dosage of the fluorescent whitening agent in a paper pulp can be partially reduced or totally abolished, and the paper whiteness and sizing degree are not influenced, thereby reaching the purposes of cleaning a papermaking system, reducing environmental pollution, and lowering production cost.

Description

technical field [0001] The invention relates to a surface sizing agent, in particular to a surface sizing agent capable of reducing the amount of fluorescent whitening agent in pulp. Background technique [0002] At present, in order to pursue high whiteness of paper, domestic paper-making enterprises add a large amount of fluorescent whitening agent to the pulp, ranging from a few kilograms to more than ten kilograms. In my country's paper industry, fluorescent whitening agents are basically added to the production of cultural paper, printing paper and cardboard. According to food safety management regulations, fluorescent whitening agents are strictly prohibited from being used in the processing of food and food-related products. [0003] Fluorescent whitening agent is a kind of fluorescent dye, or white dye, which is also a complex organic compound. Its characteristic is that it can stimulate the incident light to produce fluorescence, so that the dyed substance can obta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H19/34D21H19/14D21H19/20
Inventor 施晓旦杨迪廖秀驰
Owner SHANGHAI DONGSHENG NEW MATERIALS