Study On Preparation Of Flame Retardant Latex And Its Influence On The Performance Of Automotive Air Filter Paper

Automobile air filter paper is the core part of automobile engine air filter.It may burn and cause a safety hazards when the engine backfires.Therefore,automobile air filter paper needs to have good flame retardance.Air filter base paper has a loose structure,soft texture,low physical strength,poor water resistance.Impregnating latex is an important measure to improve the physical strength and pore structure of automotive air filter paper,and water soluble styrene acrylic latex is widely used in the production of automobile air filter paper due to its good adhesion to paper fiber,easy film formation and low cost.However the strength and water resistance of traditional styrene acrylic latex are insufficient,and the stiffness,water resistance and aging resistance of air filter paper after impregnation are poor.In view of the above problems,in this paper,four flame retardants and commercially available styrene-acrylic latex were compounded to prepare flame retardant latex,which was used to impregnate base paper to obtain a flame retardant air filter paper,the relationships between the physical properties,flame retardance of the flame retardant air filter paper and the composition of the flame retardant latex were studied,and the flame retardant was optimized.Then two functional monomers,itaconic acid(ITA)and N-isobutyloxymethylacrylamide(IBMA),and organic modified montmorillonite were used to synthesize the modified styrene acrylic latex,which was compounded with the selected flame retardant and was sequently used to impregnate the base paper to obtain the flame retardant air filter paper.The effect of the synthesis process of styrene acrylic latex on the performance of the flame retardant air filter paper was studied.The main contents of this paper are as follows:(1)The flame retardant FR3 has a good flame retardant effect on theair filter paper due to the synergistic effect of boron,phosphorus,and nitrogen,and the air filter paper impregnated with the flame retardant latex containing FR3 also has good physical strength and suitable pore size.(2)The modified styrene acrylic latex with ITA and IBMA monomers has better water resistance and thermal stability.When the ratio of ITA to IBMA is 3/1,the particle size distribution of the synthetic latex is uniform,and it has good water resistance and stability.The average pore diameter of the prepared flame-retardant air filter paper is17.7 μm,compared with the air filter paper impregnated by commercially available styrene-acrylic latex,the stiffness of air filter paper is increased by 300%,the water resistance and aging resistance are obviously improved,but the bursting strength is reduced by 14%.(3)Adding organic modified sodium montmorillonite can further improve the water resistance and aging resistance of modified styrene acrylic latex.Sodium montmorillonite is modified by Octadecyltrimethylammonium chloride(OTAC)to improve its interlayer spacing and compatibility,when the dosage of OTAC is 90mmol/100 g and the reaction time is 4h,the organic modified montmorillonite has the largest interlayer spacing,which provides more space for polymer molecules to enter during the synthesis of styrene-acrylic latex.When0.5% of the organic montmorillonite is added during the synthesis process of the modified styrene-acrylic latex,the synthetic latex has a uniform particle size distribution and has good water resistance and stability.Compared with that without organic montmorillonite,the flame retardant air filter paper has an average pore size of 14.8 μm,the water resistance and aging resistance of air filter paper are further improved,and the bursting strength is increased by 10%.