CN-121975309-A - Reinforced polyamide material and preparation method thereof

Abstract

The invention relates to a reinforced polyamide material and a preparation method thereof, belonging to the technical field of high polymer materials. The reinforced polyamide material comprises, by weight, 1398 parts of a polyamide base material, 90 parts of an additive and 12 parts of an antioxidant, wherein the additive comprises a chain extender and a stabilizer, the chain extender is an ethylene maleic anhydride copolymer, and the stabilizer is N, N-bis (2, 6-tetramethyl-4-piperidinyl) -1, 3-phthalamide. The invention starts from amidation polycondensation/chain extension reaction mechanism, combines reaction extrusion technology, designs the compounding and dosage of the chain extender and the stabilizer, and utilizes the high-activity amine group carried by the molecular structure of the polyamide base material and the anhydride functional group of the macromolecular chain extender to carry out branching reaction, thereby improving the molecular weight and melt strength of the polyamide material. Meanwhile, by compounding the antioxidant, the mechanical property and thermodynamic property of the polyamide material are improved.

Inventors

• TAO LEI
• YAN YINGWEN
• QIAO ZHIYONG
• ZHOU ZIHAN
• TANG JIANHUA
• WU HONGJUN
• WANG QINGFANG
• XIE XIMING
• LIU CHUANYONG
• MING YONGQIANG
• ZHANG YUFAN

Assignees

• 常州纺织服装职业技术学院

Dates

Publication Date

20260505

Application Date

20260131

Claims (10)

1. 1. The reinforced polyamide material is characterized by comprising the following raw materials in parts by weight: 1398 parts of polyamide base material, 90 parts of additive and 12 parts of antioxidant; the additive comprises a chain extender and a stabilizer; the chain extender is an ethylene maleic anhydride copolymer, and the stabilizer is N, N-bis (2, 6-tetramethyl-4-piperidinyl) -1, 3-benzenedicarboxamide.
2. 2. The reinforced polyamide material of claim 1, wherein the polyamide substrate comprises polyamide 6 and/or polyamide 66.
3. 3. The reinforced polyamide material of claim 1, wherein the antioxidants comprise antioxidant 1790 and antioxidant 9228.
4. 4. A reinforced polyamide material according to claim 3, wherein the mass ratio of antioxidant 1790 to antioxidant 9228 is 1:1.
5. 5. The reinforced polyamide material according to claim 1, which comprises, by weight, 1398 parts of a polyamide base material, 0 to 90 parts of a chain extender, 0 to 90 parts of a stabilizer and 12 parts of an antioxidant, wherein the parts of the chain extender and the stabilizer are not 0, and the sum of the parts by weight is 90.
6. 6. The reinforced polyamide material according to claim 5, which comprises, by weight, 1398 parts of a polyamide base material, 45 parts of a chain extender, 45 parts of a stabilizer, and 12 parts of an antioxidant.
7. 7. A method of producing a reinforced polyamide material according to any one of claims 1 to 6, comprising the steps of: Step (1) weighing the raw materials according to parts by weight; Step (2), adding the polyamide base material, a chain extender, a stabilizer and an antioxidant into a high-speed mixer together, and heating and stirring to obtain a mixture; step (3) adding the mixed material into a double-screw extruder, carrying out melt blending, and then heating and carrying out melt extrusion reaction to obtain an extrusion product; And (4) carrying out belt casting, granulating, extracting and drying on the extruded product in sequence to obtain the reinforced polyamide material.
8. 8. The method for producing a reinforced polyamide material as claimed in claim 7, wherein in the step (2), the temperature of the heating and stirring is 60℃and the stirring speed is 400rpm.
9. 9. The method for producing a reinforced polyamide material as claimed in claim 7, wherein in the step (3), the melt blending temperature is 235 to 240 ℃ and the screw rotation speed is 150 to 200rpm.
10. 10. The method for producing a reinforced polyamide material as claimed in claim 7, wherein in the step (3), the temperature of the melt extrusion reaction is 250 to 260 ℃.

Description

Reinforced polyamide material and preparation method thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a reinforced polyamide material and a preparation method thereof. Background The existing preparation methods of reinforced polyamide mainly focus on an in-situ polymerization method and a reactive extrusion method. In situ polymerization is carried out by dissolving the functional modified component and the polyamide component and then carrying out in situ polymerization to generate the reinforced polyamide material in situ. The related research is to pour the polyamide 6 prepolymer formed by anionic polymerization into a mould paved with glass fibers, and then cool and demould after in-situ polymerization reaction to obtain the glass fiber reinforced polyamide 6 composite material. Zhang Jiao (Zhang Jiao. Functionalized carbon nanotubes, graphene reinforced polyamide 66 fibers [ D ]. University of the Tianjin industry, 2023.) and the like in hexamethylenediamine adipate, followed by melt polycondensation (in situ polymerization) to prepare a carbon nanotube reinforced polyamide 66 composite material. The in-situ polymerization reaction can lead the polyamide component and the reinforcing modified component to be uniformly mixed, so as to eliminate the phase separation tendency between the two components as much as possible, and form the reinforcing polyamide material with uniform dispersion and good compatibility. However, the method is mainly based on anionic polymerization, melt polycondensation and interfacial polycondensation reaction mechanisms to prepare the reinforced polyamide, the reaction rate and the reaction degree of the prepolymer are not easy to control, and small molecular byproducts such as water and the like need to be continuously discharged in the reaction process, so that the reaction time is long, and the method is mainly suitable for laboratory researches and is not suitable for industrial production. The reaction extrusion method is to simultaneously complete specific chemical reaction of the polyamide and the functional modification component mixture in the melt extrusion process, and prepare the reinforced polyamide material through extrusion molding. In contrast, the reactive extrusion technology utilizes the covalent bonding reaction of the reactive amine groups or carboxyl groups of the polyamide and the reactive groups of other polymers to form a grafting structure so as to increase the mutual entanglement among molecular chains, so that the polyamide molecular chains are not easy to slip in the impact and stretching processes, or the polyamide reacts with a polyfunctional branching agent or a coupling agent, so that the main chain of the polyamide molecules is elongated and a long-chain branching structure is generated, entangled macromolecular chains are formed, and the mechanical properties of the polyamide molecular chains are improved by increasing the intermolecular interaction and reducing the relative slippage among molecules. The material residence time in the reaction extrusion reaction process is short, the method is suitable for rapid chemical reaction, and the actual production needs to design a reaction extrusion process according to the characteristics of the chemical reaction. The reaction extrusion method has no byproduct, controllable structure and morphology of the high polymer, low cost of sectional temperature control and energy consumption, easy automation operation and high production efficiency, and can realize continuous large-scale commercial production, so the method is mainly used for producing the reinforced polyamide material in industry. Currently, commercial reinforced polyamide material research is focused mainly on fiber reinforced polyamide materials and chain extended reinforced polyamide materials. Fiber reinforced polyamide materials are prepared by melt blending and extruding polyamide with a platy or fibrous modified filler, and common reinforcing components include glass fibers and carbon fibers. Lingesh et al （Lingesh B V, Rudresh B M, Ravikumar B N. Effect of short glass fibers on mechanical properties of polyamide66 and polypropylene (PA66/PP) thermoplastic blend composites[J]. Procedia Materials Science, 2014, 5: 1231-1240.） uses short glass fiber to reinforce and modify polyamide 66 and its homopolymer, when the mass content of glass fiber is 25%, the tensile strength and bending strength of the material are respectively improved by 44% and 33%. Liang et al uses glass fiber to enhance and modify polyamide 6, to improve the compatibility of two-phase components, and uses the esterification reaction between hydroxyl-terminated hyperbranched polyester and stearoyl chloride to prepare hydroxyl-containing hyperbranched polyester, then adds the hydroxyl-containing hyperbranched polyester into polyamide 6 and glass fiber components, and uses the action of hydroxyl