Polylactic acid composite material and preparation method thereof
A composite material, polylactic acid technology, applied in the field of polylactic acid composite materials and its preparation, can solve the problems of low calcium carbonate filling, strong interface adhesion, etc., and achieve the effects of increasing filling, low cost and simple preparation method
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Embodiment 1
[0024] 30 parts of butylene adipate-butylene terephthalate copolymer (PBAT, product of Hangzhou Xinfu Pharmaceutical Co., Ltd.) and calcium carbonate (2500 mesh, product of Zhejiang Ningbo Jiufeng Mining Co., Ltd.) 110 parts were blended in a rotor internal mixer for 2 minutes, and then 3.0 parts of methacrylic acid and 0.6 parts of dicumyl peroxide were added respectively, and mixing was continued for 5 minutes to obtain a blend. The rotor speed was 40 rpm and the temperature was 120°C.
[0025] 120 parts of PLA (4032D, a product of Natureworks LLC) and the above mixture were melt blended in a rotor internal mixer for 5 minutes to obtain a polylactic acid composite material, the rotor speed was 40 rpm and the temperature was 170°C. The polylactic acid composite material was pressed into sheets with a thickness of 1mm and 4mm using a flat vulcanizer for tensile and impact experiments. The tensile strength of the polylactic acid composite sheet is 25MPa, the elongation at break is...
Embodiment 2
[0027] Combine 28 parts of 3-hydroxybutyrate-4 hydroxybutyrate copolymer (the molar content of 4-hydroxybutyrate is 10%, the product of Shenzhen Ekman Technology Co., Ltd.) and talc powder (1250 mesh, Jiangxi Aote Fine Mine Powder Co., Ltd. product) 100 parts, 2.5 parts of acrylic acid and 0.5 parts of dicumyl peroxide were blended in a rotor internal mixer for 6 minutes to obtain a blend. The rotor speed was 50 rpm and the temperature was 135°C.
[0028] Melt blending 100 parts of PLA (4032D, a product of Natureworks LLC) with the above mixture in a rotor internal mixer for 5 minutes to obtain a polylactic acid composite material. The rotor speed is 40 rpm and the temperature is 170°C. The polylactic acid composite material was pressed into sheets with a thickness of 1mm and 4mm using a flat vulcanizer for tensile and impact experiments. The tensile strength of the polylactic acid composite sheet is 28MPa, the elongation at break is 55%, and the notched impact strength is 4.8kJ / ...
Embodiment 3
[0030] Combine 30 parts of ethylene-vinyl acetate copolymer (50% by mass of vinyl acetate, product of LANXESS, Germany) and 165 parts of calcium carbonate (60-80 nm, product of Shiraishi, Japan) in a rotor internal mixer. Mix for 2 minutes, then add 5.2 parts of methacrylic acid and 1.0 part of dicumyl peroxide, and continue mixing for 5 minutes to obtain a blend. The rotor speed is 40 rpm and the temperature is 100°C.
[0031] Melt blending 100 parts of PLA (4032D, a product of Natureworks LLC) with the above mixture in a rotor internal mixer for 5 minutes to obtain a polylactic acid composite material. The rotor speed is 40 rpm and the temperature is 170°C. The polylactic acid composite material was pressed into sheets with a thickness of 1mm and 4mm using a flat vulcanizer for tensile and impact experiments. The measured tensile strength of the polylactic acid composite sheet is 32MPa, the elongation at break is 65%, and the notched impact strength is 7.3kJ / m 2 .
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