Composite material of poly lactic acid / natural faric, and production method

[0014] Example 1

[0015] Accurately weigh 70 parts of polylactic acid and 0.3 parts of antioxidant tetra{β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid} pentaerythritol and add them to the extruder from the main hopper. At the same time, 30 parts of ramie short fibers are added to the extruder through the side feeder to be extruded and granulated, and the product is obtained after drying. Its mechanical properties are shown in Table 1 in 1 # As shown, for comparison, 0 in Table 1 # The mechanical properties of pure polylactic acid are listed.

[0016] Differential scanning calorimetry (DSC) was used to measure the crystallization performance of the composite material. The first cooling and the second heating curve were taken, and the crystallization peak (crystallization temperature) and half-width of the crystallization peak were used to characterize the crystallization rate. The higher the temperature and the narrower the half-width, the greater the crystallization rate. The area of ​​the crystallization peak (enthalpy of crystallization) and the area of ​​the melting peak (enthalpy of fusion) indicate the relative crystallinity. The greater the enthalpy, the higher the relative crystallinity. Its crystallization performance is shown in Table 2 in 1 * As shown, and 0 in Table 2 * The crystallization properties of pure polylactic acid are listed.

[0017] It can be seen from Table 1: The mechanical properties of the composite material of the present invention, such as flexural strength, flexural modulus and thermal deformation temperature, are much better than those of pure polylactic acid.

[0018] It can be seen from Table 2 that the crystallization performance of the present invention is also significantly better than that of pure polylactic acid.

[0019] Example 2

[0020] The cotton staple fiber is surface treated with coupling agent γ-glycidoxypropyltrimethoxysilane. The specific method is as follows: prepare a 1wt% coupling agent aqueous solution, drop a certain amount of concentrated hydrochloric acid to adjust the pH of the solution to pH 3 to 4, The cotton fiber is soaked in the solution, and after soaking for two hours, it is taken out and placed in a blast oven at 80°C for drying.

[0021] Accurately weigh 90 parts of polylactic acid and 0.3 parts of antioxidant tetra{β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid} pentaerythritol and add them from the main hopper to the extruder. At the same time, 10 parts of the treated cotton staple fiber is added to the extruder through the side feeder for extrusion granulation, and the product is dried after drying. The rest is the same as in Example 1, and its mechanical properties are shown in Table 1 in 2 # As shown, the crystallization properties are shown in Table 2 in 2 * Shown.

[0022] It can be seen from Table 1: The mechanical properties of the composite material of the present invention, such as flexural strength, flexural modulus and thermal deformation temperature, are much better than those of pure polylactic acid.

[0023] It can be seen from Table 2 that the crystallization performance of the present invention is also significantly better than that of pure polylactic acid.

[0024] Example 3

[0025] Ramie staple fiber is surface treated with coupling agent γ-glycidoxypropyltrimethoxysilane, and the soaking time is 0.5 hours. The specific treatment method is the same as the treatment of cotton fiber in Example 2.

[0026] Accurately weigh 80 parts of polylactic acid and 0.2 parts of antioxidant tetra{β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid} pentaerythritol and add them to the extruder from the main hopper. At the same time, 20 parts of the treated ramie short fiber was added to the extruder through the side feeder for extrusion and granulation, and the product was dried after drying. The rest are the same as in Example 1. The mechanical properties are shown in Table 1 in 3 # As shown, the crystallization properties are shown in Table 2 in 3 * Shown.

[0027] It can be seen from Table 1: The mechanical properties of the composite material of the present invention, such as flexural strength, flexural modulus and thermal deformation temperature, are much better than those of pure polylactic acid.

[0028] It can be seen from Table 2 that the crystallization performance of the present invention is also significantly better than that of pure polylactic acid.