Research on Aging Properties of Agricultural Intelligent Greenhouse Film
Traditional cover films are prone to aging and damage,and the development of new anti-aging composite films is condu-cive to recycling and reducing white pollution.A new type of composite film material was prepared by mixing polyvinyl alcohol into the traditional formula,and the aging properties of the composite film with different polyvinyl alcohol content were studied.The re-sults showed that the fluidity of the composite particles is enhanced after adding polyvinyl alcohol,which is beneficial to the prepara-tion and processing of the composite particles,but the film bubbles formed during the film blowing process are more unstable.With the increase of the content of polyvinyl alcohol,the oxidation induction period of the composite film first increased and then de-creased,and the service life of the composite film was increased when the content of polyvinyl alcohol was 20％.With the increase of polyvinyl alcohol content,the carboxyl index of the composite film decreased and finally became flat,indicating that the degree of photooxidative degradation of the composite film decreased after the addition of polyvinyl alcohol.With the increase of the content of polyvinyl alcohol,the retention rate of tensile strength and nominal strain at longitudinal fracture of the composite film both in-creased.Considering all the aging performance indexes of the composite film comprehensively,the preferred content of polyvinyl al-cohol is 20％.
万方数据
维普
