Biodegradable material poly(hexanedioic acid-para-phthalic acid-butanediol ester) foaming particles preparation method

Abstract

The invention discloses a biodegradable material poly(hexanedioic acid -para-phthalic acid-butanediol ester) (PBAT) foaming particles preparation method which is characterized in that the preparation method comprises the following steps: placing PBAT particles in an airtight container of which the temperature is 120-142 DEG C and the volume is 25 times or more than 25 times of the total volume of the particles, injecting 8-20MPa of pressure gas in the container, keeping the temperature and the pressure for 5-30min, and then relieving the pressure in a speed of 5-20MPa / s to the normal pressure to obtain the PBAT foaming particles. The cell diameter of the PBAT foaming particles is 10-260mu m and the density is 0.13-0.35g / cm<3>. The invention has simple process, easy operation, short production cycle and low cost, thus being applicable to the industrialized production.

Description

Technical field:

[0001] The invention relates to a preparation method of a biodegradable material polyadipate-terephthalate-butylene glycol (PBAT) foamed particle, which belongs to the field of biodegradable macromolecular foaming materials. Background technique:

[0002] Foam is a polymer / gas composite material based on a polymer. Because this material generally has the properties of high specific strength, high impact strength, good heat insulation and good electrical insulation, it is widely used in packaging, aircraft and auto parts, sports equipment, building materials and thermal insulation materials, and in the fields of medicine, etc. There are three main types of foam plastics: polyurethane (EPU), polystyrene (EPS), and polyethylene (EPE), but they all have their limitations. EPU has monomer residues that are harmful to the human body and cannot be completely removed; EPS has been banned by the United Nations from the production and use of catering and packaging i...

Examples

Embodiment 1

[0030] Put pure PBAT particles in a container, and ensure that the total volume of the particles does not exceed 1 / 25 of the volume of the container, so that the particles have enough space for foaming. When the container reaches the set temperature of 136°C, it is filled with high pressure N of 20MPa. 2 , keep the pressure at a constant temperature for 10min, and then release the pressure to normal pressure at a speed of 10MPa / s. The foamed material was removed and subjected to optical microscopy analysis and density measurements. The cell diameter of the PBAT expanded particles is 80 μm and the density is 0.15 g / cm 3 , the foaming ratio is 8.2 times. Particle size comparison before and after particle foaming figure 1 As shown, the optical microscope photo after foaming is as follows figure 2 shown.

Embodiment 2

[0032] Put pure PBAT particles in a container, and ensure that the total volume of the particles does not exceed 1 / 25 of the volume of the container, so that the particles have enough space for foaming. When the container reaches the set temperature of 130°C, it is filled with high pressure N of 15MPa. 2 , maintain the pressure at a constant temperature for 20min, and then release the pressure to normal pressure at a speed of 20MPa / s. The foamed material was removed and subjected to optical microscopy analysis and density measurements. The cell diameter of the PBAT expanded particles is 45 μm and the density is 0.32 g / cm 3 , the foaming ratio is 3.8 times.

Embodiment 3

[0034] Put pure PBAT particles in a container, and ensure that the total volume of the particles does not exceed 1 / 25 of the volume of the container, so that the particles have enough space for foaming. When the container reaches the set temperature of 138°C, it is filled with high pressure N of 20MPa. 2 , keep the pressure at a constant temperature for 15min, and then release the pressure to normal pressure at a speed of 10MPa / s. The foamed material was removed and subjected to optical microscopy analysis and density measurements. The cell diameter of the PBAT expanded particles is 90 μm and the density is 0.14 g / cm 3 , the foaming ratio is 8.8 times.

Technical field:

[0001] The invention relates to a preparation method of a biodegradable material polyadipate-terephthalate-butylene glycol (PBAT) foamed particle, which belongs to the field of biodegradable macromolecular foaming materials. Background technique:

[0002] Foam is a polymer / gas composite material based on a polymer. Because this material generally has the properties of high specific strength, high impact strength, good heat insulation and good electrical insulation, it is widely used in packaging, aircraft and auto parts, sports equipment, building materials and thermal insulation materials, and in the fields of medicine, etc. There are three main types of foam plastics: polyurethane (EPU), polystyrene (EPS), and polyethylene (EPE), but they all have their limitations. EPU has monomer residues that are harmful to the human body and cannot be completely removed; EPS has been banned by the United Nations from the production and use of catering and packaging i...

Examples

Embodiment 1

[0030] Put pure PBAT particles in a container, and ensure that the total volume of the particles does not exceed 1 / 25 of the volume of the container, so that the particles have enough space for foaming. When the container reaches the set temperature of 136°C, it is filled with high pressure N of 20MPa. 2 , keep the pressure at a constant temperature for 10min, and then release the pressure to normal pressure at a speed of 10MPa / s. The foamed material was removed and subjected to optical microscopy analysis and density measurements. The cell diameter of the PBAT expanded particles is 80 μm and the density is 0.15 g / cm 3 , the foaming ratio is 8.2 times. Particle size comparison before and after particle foaming figure 1 As shown, the optical microscope photo after foaming is as follows figure 2 shown.

Embodiment 2

[0032] Put pure PBAT particles in a container, and ensure that the total volume of the particles does not exceed 1 / 25 of the volume of the container, so that the particles have enough space for foaming. When the container reaches the set temperature of 130°C, it is filled with high pressure N of 15MPa. 2 , maintain the pressure at a constant temperature for 20min, and then release the pressure to normal pressure at a speed of 20MPa / s. The foamed material was removed and subjected to optical microscopy analysis and density measurements. The cell diameter of the PBAT expanded particles is 45 μm and the density is 0.32 g / cm 3 , the foaming ratio is 3.8 times.

Embodiment 3

[0034] Put pure PBAT particles in a container, and ensure that the total volume of the particles does not exceed 1 / 25 of the volume of the container, so that the particles have enough space for foaming. When the container reaches the set temperature of 138°C, it is filled with high pressure N of 20MPa. 2 , keep the pressure at a constant temperature for 15min, and then release the pressure to normal pressure at a speed of 10MPa / s. The foamed material was removed and subjected to optical microscopy analysis and density measurements. The cell diameter of the PBAT expanded particles is 90 μm and the density is 0.14 g / cm 3 , the foaming ratio is 8.8 times.

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