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Method for preparing polylactic acid, bamboo nano-cellulose whisker and ultrafine bamboo charcoal composite material film

A composite material film and nanocellulose technology, which is applied in the field of preparation of polylactic acid/bamboo nanocellulose whiskers/ultrafine bamboo charcoal composite material film, can solve the problem of reduced tensile strength, low mechanical properties, and high tensile strength of the film. problem, to achieve the effect of improving the brittleness

Inactive Publication Date: 2016-10-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN 201210485864.8 discloses a preparation method of polylactic acid / nanocellulose composite material, by preparing polyethylene glycol nanocellulose blend material, and then melt blending with polylactic acid to prepare composite material, which solves the problem of nanocellulose in polylactic acid Dispersion problem in the medium, although the tensile elongation at break is improved, but the tensile strength is reduced
CN 201510070556.2 discloses a preparation method of lignin nanocellulose reinforced polylactic acid composite film, which solves the problem of poor compatibility between nanocellulose and polylactic acid matrix by compounding lignin-containing nanocellulose and polylactic acid. The problem of low performance, but the prepared film has high tensile strength and low elongation at break

Method used

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  • Method for preparing polylactic acid, bamboo nano-cellulose whisker and ultrafine bamboo charcoal composite material film
  • Method for preparing polylactic acid, bamboo nano-cellulose whisker and ultrafine bamboo charcoal composite material film
  • Method for preparing polylactic acid, bamboo nano-cellulose whisker and ultrafine bamboo charcoal composite material film

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Experimental program
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Embodiment 1-1

[0068] Embodiment 1-1, a kind of preparation method of polylactic acid bamboo nano cellulose whisker bamboo charcoal composite material film, carries out following steps successively:

[0069] 1), bamboo nanocellulose whiskers carry out surface modification treatment:

[0070] ①. Add the silane coupling agent KH-590 as a surface modifier to the methanol / water solution (methanol / water: 80 / 20, volume ratio), adjust the pH to 4~5 with acetic acid, and test the magnetic force at 50°C Stir and hydrolyze for 30 minutes to obtain a hydrolyzed silane coupling agent solution; the solid-liquid ratio of the silane coupling agent to methanol / water solution is 1g / 25ml;

[0071] 2. According to the mass ratio of silane coupling agent:bamboo nanocellulose whiskers=8%, add bamboo nanocellulose whiskers to the silane coupling agent solution after hydrolysis, keep stirring at 45°C for 2h, wash with methanol / water solution Afterwards, drying (drying at 75° C. for 24 hours) to obtain the modifie...

Embodiment 1-2～ Embodiment 1-6

[0081] The mass ratio of silane coupling agent and bamboo nanocellulose whisker in the step 1) of embodiment 1-1 is changed into 0%, 1.0%, 2.0%, 4.0%, 16% respectively by 8%; All the other are equal to implementing Example 1-1; thus correspondingly obtain Example 1-2 to Example 1-6.

[0082] Gained composite material film is detected according to the method described in embodiment 1-1, and its tensile strength, tensile modulus and tensile elongation at break are as follows: Figure 4 mentioned.

Embodiment 2-1～2-6

[0084] Change the silane coupling agent in Example 1-1 to Example 1-6 from KH-590 to A-151; step 1) and step 2) in "methanol / water solution (methanol / water: 80 / 20, Volume ratio)" are correspondingly changed to "ethanol / water solution (ethanol / water: 80 / 20, volume ratio)"; the rest are the same.

[0085] Gained composite material film is detected according to the method described in embodiment 1-1, and its tensile strength, tensile modulus and tensile elongation at break are as follows: figure 1 mentioned.

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Abstract

The invention discloses a method for preparing a polylactic acid, bamboo nano-cellulose whisker and ultrafine bamboo charcoal composite material film. The method comprises the following steps: (1) performing surface modification treatment on bamboo nano-cellulose whiskers to obtain modified bamboo nano-cellulose whiskers; (2) performing surface modification treatment on ultrafine bamboo charcoal particles to obtain modified ultrafine bamboo charcoal particles; (3) conducting a solution pouring-solvent evaporation method: adding an organic solvent into polylactic acid, heating and stirring till polylactic acid is completely dissolved, then adding the modified bamboo nano-cellulose whiskers and the modified ultrafine bamboo charcoal particles, performing dispersion treatment to obtain a blend system, pouring the blend system in a die to manufacture a film, and drying to obtain the polylactic acid, bamboo nano-cellulose whisker and ultrafine bamboo charcoal composite material film. The method provided by the invention can endow a composite material with favorable tensile strength and tensile modulus of elasticity while toughening the polylactic acid composite material.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a method for preparing a polylactic acid / bamboo nano-cellulose whisker / ultrafine bamboo charcoal composite film. Background technique [0002] Traditional petroleum-based plastics are widely used in people's daily life, but these plastic wastes cannot be degraded naturally, causing serious environmental problems, which makes the development and utilization of fully biodegradable plastics more and more important. Polylactic acid (PLA) is an aliphatic polyester obtained by converting starch extracted from renewable plant resources such as corn and potatoes into glucose, which is fermented into lactic acid and further polymerized. It is thermoplastic and can be processed on common processing equipment like PP, PS and PET for extrusion, injection molding, bottle blowing and thermoforming to produce films, sheets, bottles and various thermoformed products. Among the biodeg...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L1/04C08K9/06C08K3/04C08J5/18
CPCC08J5/18C08J2367/04C08J2401/04C08L67/04C08L2201/06C08L2203/16C08L1/04C08K9/06C08K3/04
Inventor 盛奎川钱少平姚文超张欢欢钱湘群
Owner ZHEJIANG UNIV
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