CN-121975280-A - Machinable PETG composite foam material and preparation method thereof

Abstract

The invention discloses a machinable PETG composite foaming material and a preparation method thereof, wherein the preparation method of the PETG composite foaming material mainly comprises the steps of drying and melt blending 100 parts by weight of PETG resin, 5-20 parts by weight of calcium carbonate, 5-20 parts by weight of toughening agent and 0.5-3 parts by weight of chain extender to obtain modified PETG particles, adding the dried modified PETG particles into an injection molding machine, introducing supercritical nitrogen, and obtaining the PETG composite foaming material through melt blending and underinjection molding. According to the method, the PETG is synergistically modified by the calcium carbonate, the toughening agent and the chain extender, and the technical problems of low melt strength, easy foam collapse, poor toughness and the like of the PETG are effectively solved by combining a supercritical nitrogen injection foaming process, and the PETG composite foaming material prepared by the method has good foamability and machinability and can be applied to packaging materials of eyebrow pencil shells.

Inventors

• Qian Tonghai
• GU WENJIA
• DING HAOHAO
• LAN XIAOQIN
• WU FEI
• SHAO CHENGLI

Assignees

• 宁波杰立化妆品包装用品有限公司

Dates

Publication Date

20260505

Application Date

20260314

Claims (9)

1. 1. The machinable PETG composite foaming material is characterized by comprising 100 parts of PETG resin, 5-20 parts of calcium carbonate, 5-20 parts of toughening agent and 0.5-3 parts of chain extender.
2. 2. The machinable PETG composite foam material of claim 1, wherein the calcium carbonate in step S1 is heavy calcium carbonate having a particle size of 0.1-1 μm.
3. 3. The machinable PETG composite foam material of claim 1, wherein said toughening agent is one or more of thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), acrylic Copolymer (ACR), nylon elastomer (PEBAX).
4. 4. The machinable PETG composite foam material of claim 1, wherein said chain extender is an epoxy-type chain extender.
5. 5. The machinable PETG composite foam material of claim 4, wherein said chain extender is one of ADR4468, ADR4368, ADR 4400.
6. 6. The machinable PETG composite foam material of claim 1, applied to an eyebrow pencil shell material.
7. 7. A preparation method of a machinable PETG composite foaming material is characterized in that, a machinable PETG composite foamed material comprising any of claims 1-5, the steps of: S1, mixing the dried raw materials, namely PETG resin, calcium carbonate, a toughening agent and a chain extender, and performing twin-screw melt blending, extrusion granulation to obtain modified PETG particles; s2, adding the dried modified PETG particles into an injection molding machine, introducing supercritical nitrogen into the injection molding machine, carrying out melt blending, and carrying out injection molding foaming to obtain the PETG composite foaming material.
8. 8. The method for preparing the machinable PETG composite foam material of claim 7, wherein the raw materials and the modified PETG particles in the steps S1 and S2 are subjected to drying treatment for 6-12 hours at a drying temperature of 75-80 ℃ before being used.
9. 9. The method for preparing the machinable PETG composite foam material of claim 7, wherein the addition of supercritical nitrogen in the step S2 is 0.5-1% of the addition of modified PETG particles, and the supercritical nitrogen is high-purity nitrogen.

Description

Machinable PETG composite foam material and preparation method thereof Technical Field The invention relates to the technical field of polymer composite materials, in particular to a machinable PETG composite foaming material and a preparation method thereof. Background With the rapid development of the cosmetic industry, packaging materials that directly contact the active ingredient are being regulated, and their market has reached billions of dollars in recent years. For the safety of consumers, the safety of packaging materials is regulated by the state and related departments, wherein the related regulations of cosmetic supervision and management regulations, cosmetic safety technical regulations (2015 edition) and the like regulate that chemical reaction with cosmetics and release of substances harmful to human bodies cannot be carried out, and the compatibility between the packaging materials and the cosmetics is ensured. The packaging material is not only required to protect the product and attract consumers, but also is required to avoid the introduction of dangerous substances such as the generation of extract, and can not adsorb the effective components in the cosmetics so as to ensure the quality and efficacy of the product. At present, materials such as styrene polymers, polypropylene, polyethylene and the like are mainly used as direct contact packaging materials in the industry. With the implementation of the two-carbon policy, the use of packaging materials needs to be further reduced, and the use of silicone oil solvents and styrene polymers in cosmetics is gradually restricted and prohibited by the european related regulations, so that new materials need to be adopted for replacement in the whole industry. At present, related researches such as extrusion injection molding foaming and the like are carried out on the light weight technology of packaging materials in China, but targeted researches such as solvent resistance such as isoparaffin resistance and the like and free cutting property and the like are lacking. Polyethylene terephthalate-1, 4-cyclohexanedimethanol ester (PETG) is a completely recyclable polymer, has good tolerance to most of grease and alcohol, meets the FDA food exposure standard, and can be used for direct contact packaging materials of cosmetics. However, the PETG resin has a high elastic modulus and is poor in foamability as an intangible polymer, and the machinability of the eyebrow pencil packaging material cannot be satisfied. Disclosure of Invention The patent application aims to provide a machinable PETG composite foaming material and a preparation method thereof, so as to improve the expandability and machinability of the PETG material and obtain the foaming material suitable for eyebrow pencil packaging materials. The object of the present patent application is achieved in that: The machinable PETG composite foaming material is characterized by comprising 100 parts of PETG resin, 5-20 parts of calcium carbonate, 5-20 parts of toughening agent and 0.5-3 parts of chain extender. Preferably, the calcium carbonate in the step S1 is heavy calcium carbonate, and the particle size is 0.1-1 μm. The calcium carbonate selected by the invention not only can promote the dimensional stability of the foaming product, but also can improve the hardness and rigidity of the material, so that the foaming material is easier to plane and is easy to cut. Preferably, the toughening agent is one or more of thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), acrylic Copolymer (ACR) and nylon elastomer (PEBAX). Preferably, the chain extender is an epoxy chain extender. Preferably, the chain extender is one of ADR4468, ADR4368 and ADR 4400. The chain extender selected by the invention recovers the molecular weight and strength through chain extension, and further improves the impact resistance of PETG through synergy with toughening. The machinable PETG composite foaming material can be applied to eyebrow pencil shell materials. The preparation method of the machinable PETG composite foaming material comprises the following steps of: S1, mixing the dried raw materials, namely PETG resin, calcium carbonate, a toughening agent and a chain extender, and performing twin-screw melt blending, extrusion granulation to obtain modified PETG particles; s2, adding the dried modified PETG particles into an injection molding machine, introducing supercritical nitrogen into the injection molding machine, carrying out melt blending, and carrying out injection molding foaming to obtain the PETG composite foaming material. Preferably, the raw materials and the modified PETG particles in the steps S1 and S2 are subjected to drying treatment before use, the drying time is 6-12 hours, and the drying temperature is 75-80 ℃. Preferably, the addition amount of the supercritical nitrogen in the step S2 is 0.5-1% of the addition amount of the modified PETG particles, and the