Toughening treatment method of PHBV product

A processing method and product technology, applied in the production of bulk chemicals, etc., can solve problems such as reduction in tensile strength

Active Publication Date: 2021-08-13
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alireza Javadi et al. discuss the tensile properties of polyPHBV / poly(butylene adipate-terephthalate) (PHBV / PBAT) composites prepared by conventional injection molding; the results show that increasing the content of PBAT can significantly Improve the tensile toughness and fracture strain of the composite; but unfortunately, this method also has limitations, such as sacrificing certain strength and modulus, when the PBAT content reaches 55wt%, the elongation at break of the composite increases to 6%, but the tensile strength has dropped by nearly 50% (Polym EngSci, 2010, 50(7): 1440-8)

Method used

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  • Toughening treatment method of PHBV product
  • Toughening treatment method of PHBV product
  • Toughening treatment method of PHBV product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The PHBV sheet was obtained by injection molding, and the thickness of the sheet was 4mm. Among the PHBV raw materials used, the molecular weight was 300,000, and the HV content was 3%. The specific steps are as follows:

[0031] Step 1: Place the PHBV product in a pressure vessel with an infiltration temperature of 175°C, fill it with supercritical carbon dioxide to an infiltration pressure of 10 MPa, and then infiltrate at the infiltration temperature and pressure for 20 minutes; Step 2: Adjust the temperature of the pressure vessel to the saturation temperature for saturation, the saturation temperature is 60°C, and the saturation time is 60 minutes; step 3: depressurize the pressure vessel at a rate of 0.05MPa / s.

Embodiment 2

[0032] Embodiment 2: The saturation temperature is changed from 60° C. to 70° C., and other conditions are the same as in Embodiment 1.

Embodiment 3

[0033] Embodiment 3: The saturation temperature is changed from 60° C. to 80° C., and other conditions are the same as in Embodiment 1.

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Abstract

The invention belongs to the field of toughening of biodegradable plastics, and particularly relates to a toughening treatment method of a PHBV product. The method comprises the following specific steps: placing the PHBV product in a pressure container, sealing the pressure container, heating to an infiltration temperature of 140-180 DEG C, filling supercritical carbon dioxide to an infiltration pressure of 5-15 MPa, and then infiltrating at the infiltration temperature and the infiltration pressure for 10-60 minutes; adjusting the temperature of the pressure container to a saturation temperature for saturation, wherein the saturation temperature ranges from 60 DEG C to 120 DEG C, and the saturation time ranges from 30 min to 180 min; and releasing the pressure of the pressure container, wherein the pressure releasing rate is 0.01-1 MPa / s. According to the PHBV product toughened by the method, the tensile toughness is greater than 5MPa, the elongation at break is greater than 20%, and the impact strength is greater than 5KJ / M<2>.

Description

technical field [0001] The invention belongs to the field of toughening biodegradable plastics, and in particular relates to a toughening treatment method for PHBV products. [0002] technical background [0003] Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), as one of the most promising degradable resins, has excellent characteristics such as biodegradability and compatibility. Although PHBV has polypropylene-like mechanical properties, its apparent brittleness limits its widespread commercial use. By introducing more hydroxyvalerate (HV) segments into PHBV, the toughness of PHBV can be improved to a certain extent, but the effect is very limited. Therefore, it is necessary to modify PHBV to improve the application performance of the material. At present, the toughening of PHBV is mainly improved by blending flexible polymers or adding plasticizers. Wang et al. toughened PHBV by blending thermoplastic polyurethane (TPU). After the introduction of 40wt% TPU, the elo...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/00C08L67/04
CPCC08J7/12C08J7/00C08J2367/04Y02P20/54
Inventor 张利李微微孙巍
Owner NINGBO UNIV
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