Preparation Mechanism And Experimental Study Of Natural Latex Functional Composite Film

Natural latex is widely used as an indispensable polymer material in various fields.Latex products such as medical gloves used in life are prepared from natural latex,and medical gloves have a higher chance of contact with viruses and bacteria.In order to reduce the probability of infection,it is necessary to improve the denseness of the natural latex film and reduce the appearance of pores.Therefore,the preparation of highly dense natural latex composite films has become an important research direction in the latex products industry.In this study,we propose a method to prepare highly dense natural latex composite film by layer vulcanization stacking,which reduces the complicated process steps and vulcanization time,reduces the process and cost of filler/natural latex composite preparation,and improves the dispersion and binding of filler in natural latex.In this paper,based on the study of the film-forming mechanism of natural latex functional composite film,we designed and piloted the relevant experimental device,and researched an innovative technology of forming and vulcanizing natural latex functional composite film.The specific work accomplished is as follows:(1)The preparation mechanism of natural latex functional composite film was studied.The film formation mechanism of latex and the surface treatment mechanism of latex by low temperature plasma were focused on.(2)A pilot plant for the preparation of natural latex functional composite film was designed and piloted.According to the characteristics of the molding and vulcanization process of natural latex functional composite film,the test device is mainly composed of atomizing gun device,vulcanization device,three-dimensional slide motion platform,signal control system and so on.The device was fully commissioned to ensure the smooth preparation of the rubber film.(3)The effects of the parameters of low temperature plasma such as duration of treatment,output power and gas flow rate on the performance of the prepared latex films were analyzed and experimentally studied.The latex composite films were prepared under different parameters of duration,output power and gas flow rate,respectively,and the performance was co MPared.The optimal duration of treatment,the optimal output power of treatment process,and the optimal gas output flow rate were determined.Regular changes in the degree of cross-linking of the polymer can be found when certain factors are changed.By considering the efficiency of the plasma treatment process,the production cost and the degree of etching on the surface of the adhesive film,the optimal conditions for the treatment process were determined as follows: plasma treatment process duration of 3 min,treatment process output power of 600 W,and gas flow rate of 30 L/min.(4)The optimal treatment process for the preparation of natural latex films by atomization with low temperature plasma was developed.It was found that the atomization treatment method of low-temperature plasma was superior to the hot air atomization process in terms of surface denseness and uniformity of film formation of latex films.Under the same pretreatment conditions,the differences between the two processes were obvious through the analysis of the degree of pre-curing,mechanical properties,gas permeability,microscopic morphology,etc.The cross-linking effect,density of cross-linking,and denseness of the composite latex film prepared by low-temperature plasma atomization treatment were better than the traditional hot-air curing method,and the gas permeability decreased by 22%.The feasibility of low-temperature plasma atomization treatment method was verified.(5)The effects of low-temperature plasma treatment technology on improving the hydrophilicity of fillers were investigated,focusing on the effects of modified filler graphene on the cross-linking properties,mechanical properties,densification properties and electrical conductivity of the composite films,and microscopic characterization of contact angle,dispersion and SEM was done.It was found that co MPared w00 ith untreated graphene,the dispersion of graphene in latex by low-temperature plasma treatment was better,and the tensile strength of the prepared composite latex film was increased by 9.7% and the gas transmission rate was reduced by 12.7%.