海藻酸钠地膜制备及其性能研究

Preparation and Properties of Sodium Alginate Film

[目的]针对塑料地膜造成的白色污染问题,研究了可降解海藻酸钠地膜的制备方法。[方法]研究了海藻酸钠浓度、增塑剂种类及浓度和持水剂浓度对膜性能的影响,并通过大田试验研究了膜的降解情况。[结果]随着海藻酸钠浓度的增大,膜的拉伸强度和断裂伸长率逐渐上升。增稠剂提高了膜的拉伸强度和断裂伸长率,其中羧甲基纤维素钠的效果最好。持水剂使膜的拉伸强度和断裂伸长率降低,但解决了膜干裂的问题。[结论]海藻酸钠地膜最佳成膜液的组成为:1.0%海藻酸钠、0.2%羧甲基纤维素钠和0.6%甘油,此时海藻酸钠地膜的膜薄、拉伸强度和断裂伸长率高、透光率好,且可生物降解。

[Objective] For the white pollution caused by plastic film,preparation of sodium alginate film which can be degraded was studied.[Method]The effects of concentration of sodium alginate,the concentration and type of plasticizers and humectant concentration on the properties of sodium alginate film were studied. And the degradation of the film was studied through field experiment. [Result]The tensile strength and elongation at break of sodium alginate films increased with increasing of sodium alginate concentration and adding of plasticizers. The tensile strength and elongation at break of sodium alginate films dropped with adding of humectant,but the dehiscence was solved. [Conclusion]The best composition of sodium alginate film was 1% sodium alginate,0. 2% sodium carboxymethyl cellulose and 0. 6% glycerol. The film was thin,tensile strength and elongation at break were high,and the film could be degraded.