CN-121975233-A - Polypropylene composite material and preparation method and application thereof

CN121975233ACN 121975233 ACN121975233 ACN 121975233ACN-121975233-A

Abstract

The invention relates to the technical field of polypropylene composite materials, and provides a polypropylene composite material and a preparation method and application thereof, wherein the polypropylene composite material comprises, by mass, polypropylene, a modified toughening agent, an antibacterial agent, an antioxidant, 0.1% -1% of a lubricant and a degradation agent, the modified toughening agent comprises, by mass, a composite toughening agent, maleic anhydride, an initiator, an aromatic olefin containing conjugated double bonds and an antioxidant, the composite toughening agent comprises a first type toughening agent and a second type toughening agent, the first type toughening agent is a styrene thermoplastic elastomer, the second type toughening agent is a polyolefin elastomer, and the mass ratio of the first type toughening agent to the second type toughening agent is (0.5-2): 1, so that the compatibility of the toughening agent and the polypropylene composite material is improved, and the mechanical property of the prepared polypropylene composite material is improved.

Inventors

CHANG XUESONG
BAO YI
BAI QING
SONG WEIJIAN
Yi Xiaoliang
DU JIANQIANG
LIU ZHAOYANG
LI TAO
BIN LIMIN
WANG JI

Assignees

海信家电集团股份有限公司
海信容声(广东)冰箱有限公司
海信冰箱有限公司

Dates

Publication Date: 20260505
Application Date: 20260327

Claims (10)

1. The polypropylene composite material is characterized by comprising, by mass, 77% -88.15% of polypropylene, 10% -20% of a modified toughening agent, 0.1% -0.5% of an antibacterial agent, 0.3% -1% of an antioxidant, 0.1% -1% of a lubricant and 0.1% -0.5% of a degradation agent; Wherein, the modified toughening agent comprises 92.3 to 98.15 percent of composite toughening agent, 1 to 5 percent of maleic anhydride, 0.05 to 0.2 percent of initiator, 0.5 to 1.5 percent of aromatic olefin containing conjugated double bonds and 0.3 to 1 percent of antioxidant by mass percent; The composite toughening agent comprises a first type toughening agent and a second type toughening agent, wherein the first type toughening agent is a styrene thermoplastic elastomer, the second type toughening agent is a polyolefin elastomer, and the mass ratio of the first type toughening agent to the second type toughening agent is (0.5-2): 1.
2. The polypropylene composite according to claim 1, wherein the polypropylene is, The first toughening agent is at least one of SEBS, SBS, SIS and SEPS; The second type of toughening agent is at least one of POE, EBR, EPDM and EHM.
3. The polypropylene composite according to claim 1, wherein the antimicrobial agent is an Ag-MOF having amino or carboxyl groups attached to the surface.
4. A process for preparing a polypropylene composite material according to any one of claims 1 to 3, comprising the steps of: The preparation method comprises the steps of weighing 92.3% -98.15% of composite toughening agent, 1% -5% of maleic anhydride, 0.05% -0.2% of initiator, 0.5% -1.5% of aromatic olefin containing conjugated double bonds and 0.3% -1% of antioxidant according to mass percentage, mixing and melt extruding to obtain the modified toughening agent, wherein the mass ratio of the first type toughening agent to the second type toughening agent in the composite toughening agent is (0.5-2): 1; The polypropylene blending is carried out by weighing 77% -88.15% of polypropylene, 10% -20% of modified toughening agent, 0.1% -0.5% of antibacterial agent, 0.3% -1% of antioxidant, 0.1% -1% of lubricant and 0.1% -0.5% of degradation agent according to mass percentage, mixing, melting, extruding, cooling, and granulating to obtain the polypropylene composite material.
5. The method for preparing a polypropylene composite according to claim 4, wherein the method for preparing the antibacterial agent comprises the steps of: Taking a carboxylic acid ligand and a soluble zinc salt with the molar ratio of (1-2) 1, and dissolving the carboxylic acid ligand and the soluble zinc salt in DMF to prepare Zn-MOF, wherein the carboxylic acid ligand contains an active functional group, and the active functional group comprises at least one of amino, hydroxyl, sulfhydryl and pyridine; Activating Zn-MOF in dilute hydrochloric acid, then placing the activated Zn-MOF in a silver nitrate solution with a first concentration, stirring in a dark place, and then placing the activated Zn-MOF in a silver nitrate solution with a second concentration, stirring in a dark place, so as to obtain activated Ag-MOF, wherein the first concentration is smaller than the second concentration; dispersing the activated Ag-MOF in an amino-containing modifier for covalent bonding reaction, and washing and drying to obtain the modified antibacterial agent with the surface grafted with the amino.
6. The method for producing a polypropylene composite material according to claim 5, wherein, The carboxylic acid ligand comprises at least one of 5-hydroxy isophthalic acid, 2-amino terephthalic acid, 2, 6-pyridine dicarboxylic acid, 4-hydroxypyridine-2, 6-dicarboxylic acid, imidazole-4, 5-dicarboxylic acid, 2-methylimidazole-4, 5-dicarboxylic acid, and mercaptosuccinic acid.
7. The method for producing a polypropylene composite according to claim 5, wherein the amino group-containing modifier comprises at least one of an aminosilane coupling agent and maleic anhydride.
8. The method for producing a polypropylene composite material according to claim 4, wherein, In the step of preparing the modified toughening agent, the mixing time is 3 min-5 min, the reaction temperature of melt extrusion is 160-200 ℃, the rotating speed is 100-200 rpm, and/or In the step of polypropylene blending, the mixing time is 3-5 min, the reaction temperature of melt extrusion is 160-200 ℃, and the rotating speed is 200-300 rpm.
9. The method for producing a polypropylene composite material according to claim 4, wherein, The step of preparing the modified toughening agent is performed in a first reaction device, the step of polypropylene blending is performed in a second reaction device, and the first reaction device is communicated with the second reaction device so that the prepared modified toughening agent is input into the second reaction device.
10. Use of the polypropylene composite according to claim 1 for the preparation of low temperature resistant structures.

Description

Polypropylene composite material and preparation method and application thereof Technical Field The invention relates to the technical field of polypropylene composite materials, and mainly relates to a polypropylene composite material, a preparation method and application thereof. Background The polypropylene has the advantages of light weight, easy processing, low cost and good rigidity, and can meet the basic molding and use requirements of the refrigerator structural parts. Wherein, pure polypropylene has the disadvantage of brittleness at low temperature, and can not be used alone, and has no antibacterial property, thus affecting the use of polypropylene materials in refrigerators. In the related art, the polypropylene composite material is prepared by compounding the toughening agent, the antibacterial agent and the polypropylene, but interfacial tension exists in the process of mixing extrusion, and the compatibility of the toughening agent and the polypropylene is poor, so that the mechanical property of the prepared polypropylene composite material is reduced. Disclosure of Invention The invention aims to provide a polypropylene composite material, a preparation method and application thereof, and compatibility of polypropylene and a toughening agent in the polypropylene composite material is utilized. In order to solve the problems, the invention provides a polypropylene composite material, which comprises, by mass, 77% -88.15% of polypropylene, 10% -20% of a modified toughening agent, 0.1% -0.5% of an antibacterial agent, 0.3% -1% of an antioxidant, 0.1% -1% of a lubricant and 0.1% -0.5% of a degradation agent; Wherein, the modified toughening agent comprises 92.3 to 98.15 percent of composite toughening agent, 1 to 5 percent of maleic anhydride, 0.05 to 0.2 percent of initiator, 0.5 to 1.5 percent of aromatic olefin containing conjugated double bonds and 0.3 to 1 percent of antioxidant by mass percent; The composite toughening agent comprises a first type toughening agent and a second type toughening agent, wherein the first type toughening agent is a styrene thermoplastic elastomer, the second type toughening agent is a polyolefin elastomer, and the mass ratio of the first type toughening agent to the second type toughening agent is (0.5-2): 1. In one embodiment, the first type of toughening agent is at least one of SEBS, SBS, SIS and SEPS. In one embodiment, the second type of toughening agent is at least one of POE, EBR, EPDM and EHM. In one embodiment, the antimicrobial agent is an Ag-MOF with amino or carboxyl groups attached to the surface. In a second aspect the present invention provides a method for preparing a polypropylene composite as described in any one of the embodiments above, comprising the steps of: The preparation method comprises the steps of weighing 92.3% -98.15% of composite toughening agent, 1% -5% of maleic anhydride, 0.05% -0.2% of initiator, 0.5% -1.5% of aromatic olefin containing conjugated double bonds and 0.3% -1% of antioxidant according to mass percentage, mixing and melt extruding to obtain the modified toughening agent, wherein the mass ratio of the first type toughening agent to the second type toughening agent in the composite toughening agent is (0.5-2): 1; The polypropylene blending is carried out by weighing 77% -88.15% of polypropylene, 10% -20% of modified toughening agent, 0.1% -0.5% of antibacterial agent, 0.3% -1% of antioxidant, 0.1% -1% of lubricant and 0.1% -0.5% of degradation agent according to mass percentage, mixing, melting, extruding, cooling, and granulating to obtain the polypropylene composite material. In one embodiment, the method for preparing the antibacterial agent comprises the following steps: Taking a carboxylic acid ligand and a soluble zinc salt with the molar ratio of (1-2) 1, and dissolving the carboxylic acid ligand and the soluble zinc salt in DMF to prepare Zn-MOF, wherein the carboxylic acid ligand contains an active functional group, and the active functional group comprises at least one of amino, hydroxyl, sulfhydryl and pyridine; Activating Zn-MOF in dilute hydrochloric acid, then placing the activated Zn-MOF in a silver nitrate solution with a first concentration, stirring in a dark place, and then placing the activated Zn-MOF in a silver nitrate solution with a second concentration, stirring in a dark place, so as to obtain activated Ag-MOF, wherein the first concentration is smaller than the second concentration; dispersing the activated Ag-MOF in an amino-containing modifier for covalent bonding reaction, and washing and drying to obtain the modified antibacterial agent with the surface grafted with the amino. In one embodiment, the carboxylic acid ligand comprises at least one of 5-hydroxyisophthalic acid, 2-amino terephthalic acid, 2, 6-pyridinedicarboxylic acid, 4-hydroxypyridine-2, 6-dicarboxylic acid, imidazole-4, 5-dicarboxylic acid, 2-methylimidazole-4, 5-dicarboxylic acid, and mercaptosuccinic acid. In one e