Development of styrene acrylic waterborne polish f

Development of styrene acrylic Waterborne Glazing oil for printing paper

release date: Source: China packaging

styrene, methyl methacrylate, butyl acrylate and other monomers are used to synthesize styrene acrylic lotion by absorbing some characteristics of micro lotion polymerization and soap free lotion polymerization and feeding in a semi continuous feeding mode without pre emulsification. The effects of pH regulator, subsequent monomer dropping time and heat preservation reaction time on the properties of lotion and latex film were studied. The results showed that the monomer conversion, solid content and gel ratio of the prepared lotion were 95.31%, 42.66% and 0.41% respectively; The gloss of the latex film reaches 94.8%, and the water absorption is 19.2%. The hardness, flexibility and adhesion of the latex film are excellent. Today, China paper industry takes you into the related content of packaging and printing paper, and introduces the development of varnish in detail

key words: semi continuous feeding; Microemulsion polymerization; Soap free lotion polymerization; Styrene acrylic lotion; Latex film performance

using synthetic resin instead of grease and water instead of organic solvents has become one of the main development directions of the coating industry. Paper water-based glazing oil is a new type of glazing paint with the improvement of the glazing requirements of packaging materials and the enhancement of people's awareness of environmental protection. Its advantages of advanced technology, convenient use and economic rationality make it have great development prospects. It has gradually replaced solvent based glazing oil and oily glazing oil, and will occupy a dominant position in the printing and packaging industry

at present, the majority of waterborne polish is water lotion. According to the polymerization method, it mainly includes ordinary lotion polymerization, microemulsion polymerization, core-shell lotion polymerization and soap free lotion polymerization. The first three polymerization methods, especially micro lotion polymerization, use more emulsifiers in the preparation process. The residual emulsifiers will affect the transparency, water resistance, gloss and other properties of the emulsion film, and also cause environmental pollution, limiting its scope of use. Although soap free lotion polymerization without emulsifier overcomes the disadvantages caused by the addition of emulsifier, its reaction system is unstable, the size of latex particles formed is large, and the distribution is uneven, which makes its latex film glossy, and also limits its application in paper polishing. In this work, the semi continuous feeding method without pre emulsification is adopted, and some advantages of micro lotion polymerization and soap free lotion polymerization are absorbed. An appropriate amount of emulsifier is added at the initial stage of polymerization, and an appropriate amount of hydrophilic monomer is added at the later stage of polymerization, which not only reduces the total amount of emulsifier, but also ensures the stability of the reaction system, and achieves good results

1 experimental part

1.1 raw material

styrene (st): chemically pure, Dongda chemical plant, Dongli District, Tianjin; Methyl methacrylate (MMA): analytical pure, Shanghai Ying Chemical Co., Ltd; Butyl acrylate (BA): chemically pure, Tianjin Institute of chemical reagents; Bifunctional monomer (s monomer for short): Industrial polymerization grade, commercially available; Acid-1: chemically pure, Shanghai reagent No.1 Factory; Acid-2: chemically pure, Tianjin Institute of chemical reagents; Sodium dodecylbenzene sulfonate (SDBS): chemically pure, Shanghai reagent station central chemical plant; Polyethylene glycol octyl phenyl ether (OP): chemically pure, Shanghai reagent No.1 Factory; Ammonium persulfate (APS): analytically pure, Beijing No. 3 chemical reagent factory; Ammonia: analytically pure, Zhengzhou No.2 Chemical Reagent Factory; Triethylamine: analytically pure, Beijing chemical plant; Sodium bicarbonate: analytically pure, commercially available; Disodium hydrogen phosphate, analytically pure, commercially available

1.2 the preparation of styrene acrylic lotion

and the rubber used in tires or shock absorbers belong to polymers. In a four port reactor equipped with stirrer, thermometer, reflux condenser and separation funnel, emulsifier and distilled water are added first, stirred, heated to a certain temperature, and a small amount of monomers (st, MMA, Ba, etc.) are added. After emulsification, this kind of slip is unrecoverable. Then, follow-up monomers and initiators are added by semi continuous method, Heat preservation reaction at a certain pH value and temperature for a certain time, adjust the pH value to 7-8, lower the temperature, and discharge the material to obtain styrene acrylic lotion

1.3 test of lotion performance

gel content after the polymerization reaction, collect gel in the inner wall of the mixing shaft blade reactor and lotion in the reaction system, dry it to constant weight (WG), and calculate gel content according to the following formula（ σ）：

(1) gel content（ σ） In the formula

, WM is the total mass of monomer input into the reaction system

monomer conversion was determined according to GB (88). Put a certain amount of sample into a dry and clean Petri dish with weighed W, weigh the mass W0 of the sample, and bake it in a 105 ℃ blast oven to constant weight, weigh the mass W 'of the Petri dish and the latex film, and calculate the monomer conversion rate P according to the following formula:

(2) monomer conversion rate P calculation formula

separated by air gap: WP is the total output of lotion; M1 and M2 are the dosage of initiator and emulsifier in the reaction system

the solid content of lotion is determined according to GB (88). Add a certain amount of sample into the dry and clean Petri dish with weighed W, weigh the mass stroke range of the sample, and bake it in the 105 ℃ blast oven to the constant weight W ', then the solid content x is calculated according to the following formula:

(3) solid content x calculation formula

viscosity is measured at room temperature with NDJ-79 rotary viscometer (manufactured by Tongji University Electromechanical Factory)

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