Method for preparing polylactic acid/bamboo particle/bamboo charcoal composite materials

A composite material, polylactic acid technology, applied in the field of preparation of polylactic acid/bamboo particles/bamboo charcoal composite materials, can solve the problem of incomplete optimization of ultra-fine bamboo charcoal pore channels, limited improvement in toughness and other properties, and increased tensile elongation at break, etc. problems, to achieve the effect of increasing the specific surface area and surface activity, improving the performance of the surface and interface, and improving the aggregation form

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Problems solved by technology

However, polylactic acid has weak crystallization ability and slow crystallization speed, and the processed polylactic acid products often have problems of poor strength and toughness, especially its impact strength and tensile elongation at break are about 8J / m and 3.5%, respectively. Greatly limit its use in areas with high toughness requirements
[0003] The mechanical properties of PLA can be effectively improved by introducing reinforcements, but the size, shape, interface and other properties of reinforcements have a great influence on the performance of PLA composites.
The Chinese patent application with the application number 201610555090.X discloses a preparation method of polylactic acid bamboo nanocellulose whisker bamboo charcoal composite film. The method uses a solution casting method to cast bamboo fiber nanocrystals, ultrafine bamboo charcoal and polylactic acid into a composite film. film, the tensile elongation at break of the obtained composite material is greatly improved, but the preparation of nanomaterials is complicated and the cost is high, and the elastic modulus of the film prepared by this method is much lower than that of pure polylactic acid material
The Chinese patent application with the application number 201610560604.0 discloses a preparation method of polypropylene / bamboo particles / ultramicro bamboo charcoal composite material, which can improve the tensile properties and bending properties of polypropylene-based composite materials and improve the toughness of the material, but Among them, the shape of bamboo particles is single, the pore channels of ultra-fine bamboo charcoal are not fully optimized, and the improvement of toughness and other properties is limited.

Method used

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  • Method for preparing polylactic acid/bamboo particle/bamboo charcoal composite materials
  • Method for preparing polylactic acid/bamboo particle/bamboo charcoal composite materials

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Embodiment 1

[0045] The preparation method of the polylactic acid / bamboo particle / bamboo charcoal composite material of embodiment 1, comprises the following steps:

[0046] 1), first carry out broomification pretreatment to the bamboo particles, the specific process is:

[0047] Take bamboo granules with a particle size of 40 meshes and pre-dry them at 100°C for 15 hours to obtain dried bamboo granules;

[0048] Prepare pretreatment liquid, this pretreatment liquid is formulated with the weight ratio of 5:12:83 by NaOH, urea and pure water;

[0049] Take an appropriate amount of dry bamboo granules and put them into the pretreatment solution, soak them at room temperature for 4 hours, then use a centrifuge to repeatedly add pure water to centrifuge 5 times at a speed of 9000rpm, and then use a sand core funnel to repeatedly filter and wash 4 times to remove residual NaOH and urea to get swelling bamboo particles;

[0050] Take an appropriate amount of swollen bamboo particles and put th...

Embodiment 7

[0067] The preparation method of the polylactic acid / bamboo particle / bamboo charcoal composite material of embodiment 7, the difference with embodiment 1 is, in the step 1) of embodiment 7, pretreatment liquid is by NaOH, urea and pure water with 7:13:80 The weight ratio is formulated, and the homogenization treatment conditions are: homogenization treatment at 60°C and 120MPa for 60 minutes, the silane coupling agent is A-151, and methanol / water solution is changed to ethanol / water solution; step 2) The silane coupling agent is A-151, and the HNO with a material-to-liquid ratio of 55g / 100mL is prepared 3 / aqueous solution, methanol / aqueous solution is changed into ethanol / aqueous solution; The nucleating agent used in step 3) is the PEG of molecular weight 2000, and consumption is 4% of polylactic acid particle weight; Step 4) in, change thermocompression molding into extrusion The process of extrusion molding and extrusion molding is as follows: send the mixed sample into th...

Embodiment 13

[0070] The preparation method of the polylactic acid / bamboo particle / bamboo charcoal composite material of embodiment 13, the difference with embodiment 1 is, in the step 1) of embodiment 7, pretreatment liquid is made of NaOH, urea and pure water with 6:13:81 The weight ratio is formulated, the homogenization treatment conditions are: homogenization treatment at 70°C and 110MPa for 50min, the silane coupling agent is KH-550, the methanol / water solution is changed to ethanol / water solution, and the ratio of 1g / Add silane coupling agent KH-550 as a surface modifier to the ethanol / water solution at a solid-liquid ratio of 20mL, and the stirring hydrolysis time at 50°C is 40min; in step 2), the prepared solid-liquid ratio is 55g / 100 mL of HNO 3 / water solution, the silane coupling agent is KH-550, change the methanol / water solution to ethanol / water solution, add the silane coupling agent KH-550 as a surface modifier to the ethanol / water solution at a solid-liquid ratio of 1g / 10...

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Abstract

The invention discloses a method for preparing polylactic acid/bamboo particle/bamboo charcoal composite materials. The method includes steps of 1), carrying out brooming pretreatment on bamboo particles, and further carrying out surface modification treatment to obtain modified bamboo particles; 2), carrying out surface modification treatment on bamboo charcoal particles to obtain modified bamboocharcoal particles; 3), premixing the modified bamboo particles, the modified bamboo charcoal particles, polylactic acid particles and nucleating agents at the normal temperature and the high speedsto obtain premixed particles; 4), carrying out melt blending, hot-press molding or extrusion molding on the premixed particles to obtain the polylactic acid/bamboo particle/bamboo charcoal composite materials. The method has the advantages that the aggregation morphology, the dispersibility and the surface and interface properties of the bamboo particles and the bamboo charcoal particles in polylactic acid matrixes can be effectively improved by the aid of the method, reinforcement structures of polylactic acid molecular chains can be optimized, and accordingly the high-performance polylacticacid/bamboo particle/bamboo charcoal composite materials with the excellent mechanical properties such as the strength and the toughness (the elongation at break and the impact strength) can be prepared by the aid of the method.

Description

technical field [0001] The invention relates to the technical field of composite material processing, in particular to a preparation method of a polylactic acid / bamboo particle / bamboo charcoal composite material. Background technique [0002] Polylactic acid (PLA) is an aliphatic polyester plastic transformed from biomass starch, which has good biocompatibility and biodegradability. Due to its excellent environmental friendliness and processability, it has good application potential and prospects in the fields of biology, medical treatment, agriculture, engineering materials, packaging and so on. However, polylactic acid has weak crystallization ability and slow crystallization speed, and the processed polylactic acid products often have problems of poor strength and toughness, especially its impact strength and tensile elongation at break are about 8J / m and 3.5%, respectively. It greatly limits its use in areas with high toughness requirements. [0003] The mechanical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02C08K9/02C08K9/06C08K7/24C08H8/00
Inventor 钱少平龙洁何欢陶莹莹
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