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Surface sizing agent and its production method

A technology of surface sizing agent and auxiliary agent, applied in the field of display sizing agent and its preparation, can solve the problems of easy demulsification, low chemical stability, affecting application effect, etc., achieve the ability to prevent demulsification and improve emulsification ability , Improve the effect of water solubility

Inactive Publication Date: 2009-06-17
上海埃格环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN1546792A discloses (a) adding (b) traditional compound emulsifier to adding (c) various sizing accelerators, sizing accelerator compounding agents and polysiloxanes in hydrophobic monomers and hydrophilic monomers Although the surface sizing agent preparation method of the defoamer can improve the sizing effect, adding traditional emulsifiers and more auxiliary agents increases the ion complexity of the emulsion and affects the use effect of the sizing agent; in US Patent No. 5,240,771, Disclosed is a surface sizing agent obtained by emulsion polymerization of (a) acrylic acid (b) unsaturated acrylic acid or acid compound (c) water-soluble monomer (d) other comonomers (e) polyvinyl alcohol
Although the storage stability and sizing performance of the surface sizing agent are good, its chemical stability is low, and it is easy to break the emulsion during use, thus affecting its practical application effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0034] Preparation Example 1: Add 10 parts of nonylphenol polyoxyalkylene ether and 150 parts of deionized water into a glass bottle equipped with a thermometer and a stirrer, and stir at 50° C. for 20 minutes. Then slowly add 100 parts of vinyl acetate, 40 parts of butyl acrylate and 10 parts of diethylhexyl acrylate, gradually increase the stirring speed and stir and emulsify for 1 hour to prepare a pre-emulsion; add 4 parts of ammonium persulfate and 40 parts of deionized water to mix and stir Form initiator solution; Add 300 parts of deionized water at 50° C., 2 parts of polyvinyl alcohol, 15% of pre-emulsion and 10% of For the initiator solution, continue heating and stirring to raise the temperature to 70°C, and when the blue light appears in the emulsion, start adding the remaining pre-emulsion and initiator solution dropwise, and control the addition within 2 hours. After the reaction is completed, keep warm for 45 minutes, cool down to 45°C and add an appropriate amou...

preparation Embodiment 2

[0035]Preparation Example 2: Add 8 parts of sodium lauryl sulfate and 180 parts of deionized water into a glass bottle equipped with a thermometer and a stirrer, and stir at 50° C. for 20 minutes. Slowly add 100 parts of styrene, 70 parts of methyl acrylate and 35 parts of sodium hydroxypropanesulfonate methacrylate, gradually increase the stirring speed and stir and emulsify for 1 hour to prepare a pre-emulsion; add 2 parts of ammonium persulfate and 40 parts of deionized water to mix Stir to form an initiator solution; add 400 parts of deionized water at 50°C, 5 parts of polyvinyl alcohol, 15% of pre-emulsion and 10% Continue heating and stirring to raise the temperature to 70°C, and when the blue light appears in the emulsion, start adding the remaining pre-emulsion and initiator solution dropwise, and control the addition within 2 hours. After the reaction is completed, keep warm for 45 minutes, cool down to 45°C and add an appropriate amount of ammonia water to adjust the...

preparation Embodiment 3

[0036] Preparation Example 3: Add 4 parts of sodium dodecylbenzenesulfonate and 200 parts of deionized water into a glass bottle equipped with a thermometer and a stirrer, and stir at 50° C. for 20 minutes. Then slowly add 100 parts of methyl methacrylate, 90 parts of ethyl acrylate and 20 parts of sodium methacrylate hydroxypropyl sulfonate, gradually increase the stirring speed and stir and emulsify for 1 hour to prepare a pre-emulsion; add 8 parts of potassium persulfate and 40 parts of Mix and stir the ionic water to form an initiator solution; add 400 parts of deionized water at 50°C, 2 parts of polyvinyl alcohol, and 15% of pre-emulsion and 10% initiator solution, continue heating and stirring to raise the temperature to 70°C, and when the blue light appears in the emulsion, start to add the remaining pre-emulsion and initiator solution dropwise, and control the addition within 2 hours. After the reaction is completed, keep warm for 45 minutes, cool down to 45°C and add ...

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Abstract

The invention relates to a method for preparing a surface sizing agent for papers. The raw materials used for preparing the surface sizing agent for papers consist of main agents and assistant agents. The main agents are rigid monomers, soft monomers and functional monomers; and the assistant agents are compound emulsifying agents, protective colloids and evocating agents. The proportions of the main agents by weight are as follows: 100 portions of rigid monomers, 40 to 100 portions of soft monomers and 5-40 portions of functional monomers; and the proportions of the assistant agents by weight are as follows: 1 to 10 portions of compound emulsifying agents, 1 to 10 portions of protective colloids and 1 to 8 portions of evocating agents. Compared with the styrene-maleic anhydride surface sizing agent prepared by common emulsifying agents, the surface sizing agent for papers prepared by the method has good mechanical stability, the latex contains no residual emulsifying agents, the particle surface is clean, and no side influence resulted from the emulsifying agents is existed during the sizing and drying process; the surface sizing agent has good membrane forming performance on the paper surface so as to provide excellent water-proof performance and surface flatness for the paper; and the surface sizing agent can increase the stiffness and the smoothness of the paper surface greatly.

Description

technical field [0001] The invention relates to a display sizing agent and a preparation method thereof, which is used for surface sizing of paper in the papermaking process to improve the display performance of paper and improve the quality of paper, and belongs to the field of papermaking chemicals. technical background [0002] Sizing is an important process in papermaking, the purpose is to make paper or paperboard resistant to the diffusion and penetration of liquids (especially water and aqueous solutions). Sizing can be divided into internal sizing and surface sizing, because internal sizing is easily affected by production conditions (such as water quality, pH value, temperature, and shear rate during pumping); at the same time, with the development of printing technology Improvement, high-speed printing and the application of high-viscosity inks have put forward higher requirements for the surface strength and surface smoothness of paper, which is difficult to achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 朱勇强易玉林丁国际
Owner 上海埃格环保科技有限公司
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