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Internal sizing agent and preparation method thereof

A technology of sizing and monomer in pulp, applied in the direction of adding reinforcing agent, adding water repellent, adding inorganic compound, etc., can solve the problems of lag in sizing performance, difficult papermaking sewage treatment, poor retention effect, etc. Enhanced toughness and water resistance, overcoming the effect of sizing lag

Active Publication Date: 2020-03-20
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently commonly used AKD sizing agent has disadvantages such as high cost, lagging sizing performance, poor retention effect, and difficult papermaking wastewater treatment.

Method used

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  • Internal sizing agent and preparation method thereof
  • Internal sizing agent and preparation method thereof
  • Internal sizing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 50g of cellulose, 20g (37wt%) formaldehyde, 15g of sodium hydroxide were dissolved in 580g of deionized water, the temperature of the reactor was raised to 90°C, and the reaction was carried out for 1.5h, then 20g of epichlorohydrin and methyl methacrylate were added to the reactor. 40g of ester, the temperature was raised to 85°C, and 20g (1.25wt%) of sodium persulfate solution was added dropwise within 1 hour, then kept for 2 hours, cooled and filtered to obtain a finished product with a solid content of 18.2%.

Embodiment 2

[0025] 40g of hemicellulose, 15g (37wt%) formaldehyde, and 10g of sodium hydroxide were dissolved in 500g of deionized water, and the reactor was heated to 80°C for 2.5h of reaction. Then, 15g of propylene oxide and 30g of acrylic acid amide were added to the reactor. The temperature was raised to 80° C., and 15 g (1.25 wt%) of potassium persulfate solution was added dropwise within 1 hour, and then kept for 3 hours, cooled and filtered to obtain a finished product with a solid content of 15.8%.

Embodiment 3

[0027] Xylose 30g, 10g (37wt%) formaldehyde, sodium hydroxide 10g are dissolved in 550g deionized water, the reaction kettle is warmed up to 85 ℃, reacts 2h, then adds epichlorohydrin 10g, acrylonitrile 20g in the reaction kettle, temperature The temperature was raised to 75° C., and 10 g (1.25 wt%) of ammonium persulfate solution was added dropwise within 1 hour, and then kept for 4 hours, cooled and filtered to obtain a finished product with a solid content of 11.5%.

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Abstract

The invention discloses a preparation method of an internal sizing agent. The preparation method comprises the following steps: 1, mixing a papermaking black liquor extract, a formaldehyde monomer andan alkaline substance, and sufficiently reacting; and 2, adding an epoxy monomer, a vinyl monomer and an initiator into the product obtained in the step 1, and fully reacting to obtain the internal sizing agent. According to the internal sizing agent disclosed by the invention, the renewable materials are used as the raw materials, so that the requirements of green chemistry are met; and based onthe performances, the novel efficient internal sizing agent can be rapidly cured in the drying process after papermaking, the toughness and the water resistance of paper are enhanced by introducing the epoxy monomer and the vinyl monomer, and the defect of sizing effect lagging in the application of AKD as the sizing agent is overcome.

Description

technical field [0001] The invention relates to the field of preparation of pulp and paper sizing agents, in particular to an internal pulp sizing agent and a preparation method thereof. Background technique [0002] Sizing agent is an additive for papermaking. Through sizing process, it can endow paper with certain physical properties, prevent the penetration and diffusion of some fluids, and at the same time endow paper and cardboard with ink-resistance, water-resistance, emulsion-resistance, and corrosion-resistance. Improves its smoothness, strength and longevity. The currently commonly used AKD sizing agent has disadvantages such as high cost, lagging sizing performance, poor retention effect, and difficult papermaking sewage treatment. Contents of the invention [0003] The present invention aims to provide a preparation method of an internal sizing agent to solve the above-mentioned defects in the background technology, and can significantly reduce environmental po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H21/18D21H17/66
CPCD21H21/16D21H21/18D21H17/66
Inventor 施晓旦段鹏真金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD