Preparation method of emulsion antioxidant

Abstract

The invention discloses a preparation method of an emulsion antioxidant, relating to a preparation method of a synthetic material antioxidant product. The method comprises the following steps of: preparing a composite antioxidant from a phenol antioxidant, di(isotridecanol) pentaerythritol diphosphite or tri(nonylphenyl) phosphite serving as a liquid phosphite ester antioxidant and thiodipropionate diisononanoate ester serving as a liquid thioether antioxidant; adding a surfactant and an organic solvent; heating to 50-120 DEG C with stirring to form a liquid organic phase component in a homogenized state; adding deionized water and a dispersant respectively to disproportionate potassium rosinate soap lye; and implementing a high-speed shearing and mixing method to obtain an antioxidant product in a fine particle emulsion state. In the method, an aqueous emulsion antioxidant is produced with an emulsion method, the antioxidant exists in the form of liquid fine particles, is uniformly dispersed in an emulsion and has particularly high intermiscibility with a polymer in ABS (Acrylonitrile Butadiene Styrene) rubber latex, and effective composite antioxidant components can be uniformlydispersed in ABS grafted powder after agglomeration, so that the efficiency of the antioxidant is increased.

Description

technical field [0001] The invention relates to a process for preparing synthetic material antioxidant products, in particular to a process for preparing an emulsion-type antioxidant used in the production of ABS latex by an emulsion graft polymerization process. Background technique [0002] The anti-aging problem of ABS resin is relatively prominent. Under the action of heat, light and oxygen at ambient temperature, ABS resin will gradually turn yellow, harden and become brittle, and it can cause coking and blackening at higher temperatures. In order to inhibit or delay its oxidative degradation during production, processing, and use, the addition and selection of antioxidants is crucial. Suitable antioxidants can effectively improve the anti-aging performance of resins and prolong their service life. [0003] The ABS latex produced by the emulsion graft polymerization process is a terpolymer composed of acrylonitrile, butadiene and styrene. Polybutadiene elastic particles...

AI Technical Summary

Problems solved by technology

[0017] During the stabilization process of ABS grafted powder, the hindered phenol primary antioxidant and thioester antioxidant stabilization system effectively delayed the aging speed of the resin, However, when it is necessary to improve the processing temperature and the application performance of the final product, the oxidation products of hindered phenolic main antioxidants tend to cause color stains on the polymer, which makes the color stability of the ABS grafted powder worse. In order to improve its thermal stability Stability and anti-tarnish performance, the use of phosphite antioxidants can effectively improve the color stability and high temperature thermal stability of the product

[0018] Fine Chemical Industry, 2002, 19 (5) disclosed the compound antioxidant YHK-1, put trinonylphenyl phosphite and dispersant A in the reactor, stir evenly and heat up to a certain temperature, add a certain The proportion of antioxidant 245, its disadvantage is that the hot water melts the antioxidant and uses it after emulsification, which makes the production process cumbersome, and the dispersion of the antioxidant in the ABS latex is uneven

[0019] Plastic Science and Technology, 2007, 35 (8) proposed to use antioxidant 1076, T501, trinonylphenyl sulfide phosphite, and anti-hydrolysis stabilizer to form an emulsion antioxidant to be used in ABS latex. The effect of 1076 and T501 as the main antioxidant is not very good. In addition, the thioether antioxidant in YHK-2 and YHK-4 is not disclosed, and the addition of aniline is likely to cause pollution and discoloration of the product

[0020] China Plastics, 2008, 22 (4) discloses that the emulsion compounded with antioxidant Irganox 245 and DLTDP is used in ABS latex. Melting in hot water and re-emulsification makes the production process cumbersome. In addition, it is difficult for the antioxidant component to disperse evenly in the emulsion, so that it cannot be evenly dispersed in the ABS latex. As a result, the obtained ABS powder has a poor antioxidant effect.

[0021]Petrochemical Technology and Application, 2009, 27(3), discloses the compounding of antioxidant 2246 and antioxidant 168 used in ABS latex, its shortcomings The anti-aging performance is poor, and the product is easy to age and turn yellow. It is recommended to use the antioxidant Wingstay-L and the thioester auxiliary antioxidant DLDTP to make a water emulsion type composite use

[0022]Plastic Additives, 2008, No4, introduced the method of preparing an emulsion-type ABS antioxidant by the Daqing Chemical Research Center of China Petrochemical Research Institute, and its shortcomings The variety, formula, preparation process, and process parameters of each antioxidant are not disclosed. In addition, the energy consumed by the mechanical grinding mixed material process is large, and the labor cost is high, which is not convenient for industrial production. What is more important is the mechanical grinding of antioxidants. Large average particle size, poor compatibility with ABS latex, resulting in low antioxidant efficiency

[0029] The disadvantage of CN 101654540 and CN101805458 is that the antioxidant system formed is solid at normal temperature, and there is no suitable solvent to dissolve it, so the water emulsion type antioxidant can only be produced by the suspension method

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