CN-121975235-A - High-interface affinity bionic polypropylene material suitable for water transfer printing process and used for automotive interiors

CN121975235ACN 121975235 ACN121975235 ACN 121975235ACN-121975235-A

Abstract

The invention relates to the technical field of polymer compositions, and discloses a high-interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process, and comprises the following components: the invention provides an isotactic polypropylene matrix and a bionic interface coupling factor containing catechol functional groups, which are complemented to the total weight proportion, wherein the bionic interface coupling factor is driven to migrate to the surface by utilizing the impurity removal effect generated by matrix crystallization, and a co-crystallization physical anchoring structure is formed by conformation matching of a hydrophobic end long-chain alkyl group and a matrix crystal region.

Inventors

MO HONGYUAN
MO XIU
ZHU HONGLIN
QIU YUQIN
XU WEIJIE

Assignees

郴州科远达汽车精工部品有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. The high interface affinity bionic polypropylene material for the automotive interior fitting the water transfer printing process is characterized by comprising the following components in parts by weight based on 100 parts by weight: 1.5 to 3.0 parts of a bionic interface coupling factor; Supplementing up to 100 parts of isotactic polypropylene matrix; wherein the isotacticity of the isotactic polypropylene matrix is greater than 96%, at 190 And a melt flow rate of 35g/10min to 45g/10min under a load of 2.16 kg; the bionic interface coupling factor is 140 of eicosanyl succinic anhydride, paraformaldehyde and polyamine compound The product generated by amidation reaction under the condition, and the mole fraction of catechol functional groups in the bionic interface coupling factor is 18 to 22 percent; The bionic interface coupling factor comprises a hydrophobic end formed by linear alkyl with a carbon chain length of 20 and a hydrophilic end containing catechol functional groups, wherein in the cooling process after injection molding of the material, the conformation of the linear alkyl is matched with the thickness of a crystal zone platelet of an isotactic polypropylene matrix, so that the bionic interface coupling factor is driven to migrate towards the surface of the material by utilizing the impurity removal effect in the crystallization process of the isotactic polypropylene matrix, the hydrophobic end is embedded into a crystal face gap at the edge of a spherical crystal of the isotactic polypropylene matrix, a cocrystal physical anchoring structure is formed between the hydrophobic end and the isotactic polypropylene matrix, and the catechol functional groups at the hydrophilic end are directionally distributed and fixed on the surface layer of the material, so that a catechol polar layer with solvent scouring resistance is formed on the surface of the material.
2. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process according to claim 1, wherein the molecular weight distribution index of a bionic interface coupling factor is as follows 1.25 To 1.35, and the material is prepared by adding an isotactic polypropylene matrix and a bionic interface coupling factor into a homodromous double-screw extruder with the length-diameter ratio of 44:1, and the temperature of a machine barrel is 180 DEG To 210 And (3) carrying out melt blending under the condition of ensuring that the bionic interface coupling factor realizes molecular-level dispersion in the isotactic polypropylene matrix.
3. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process, according to claim 1, wherein the mole fraction of catechol functional groups in bionic interface coupling factors is as follows The following relationship is satisfied: , wherein, Is the mole number of catechol functional groups in bionic interface coupling factors, Is the total mole number of the bionic interface coupling factors.
4. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process, according to claim 1, wherein amide groups in the bionic interface coupling factors and catechol functional groups form a hydrogen bonding network on the surface of the material, so that the surface tension of the surface of the material is not lower than 38mN/m.
5. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process according to claim 1, wherein the linear alkyl group at the hydrophobic end is embedded between the lamellar crystal layers of the spherulites of the isotactic polypropylene matrix by van der waals force, and the embedding depth of the co-crystallized physical anchoring structure below the surface layer of the material is 15nm to 25nm.
6. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process, according to claim 1, wherein the temperature of the material in an injection mold is 45 DEG C To 55 to And (3) forming under the condition of using a temperature gradient formed by the isotactic polypropylene matrix at the die wall to drive the enrichment of the bionic interface coupling factor to the surface of the material.
7. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process, according to claim 1, wherein the coverage rate of catechol functional groups enriched on the surface layer of the material on the surface of the material is not less than 15%, and interface combination is formed with water transfer printing ink through a hydrogen bond combining network.
8. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process according to claim 1, wherein the material does not contain maleic anhydride grafted polypropylene and polar monomer grafted polypropylene.
9. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process according to claim 1, wherein the peel strength of the catechol polar layer on the surface of the material after contacting with the water transfer printing activating solvent is maintained constant.
10. The high interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process according to claim 1, wherein the material is used for manufacturing an automotive center control panel, an automotive door guard board or an automotive interior trim strip.

Description

High-interface affinity bionic polypropylene material suitable for water transfer printing process and used for automotive interiors Technical Field The invention belongs to the technical field of polymer compositions, and particularly relates to a high-interface affinity bionic polypropylene material for automotive interiors, which is suitable for a water transfer printing process. Background The method is characterized in that the prior polypropylene material has low density, good chemical stability and excellent processability, is widely used for producing automotive interior parts, utilizes a water transfer printing process to construct decorative textures on the surfaces of interior parts, is difficult to form stable adhesion on the surfaces of base materials due to the fact that polypropylene belongs to nonpolar materials and has low surface tension, and is usually grafted and modified by polar monomers or the surfaces of the parts are subjected to flame and corona treatment before transfer printing so as to improve the wettability of interfaces. In order to avoid mechanical loss caused by material body modification, improvement is tried in industry from a transfer printing process flow, for example, chinese patent publication No. CN106274117A discloses a water transfer printing process, physical and chemical properties of an image-text layer are improved through UV ink printing, image-text layer activation and subsequent ultraviolet light curing means, however, deep analysis shows that the technical route focuses on crosslinking curing and film forming strength of the film layer per se and does not touch an inert intrinsic pain point on the surface of a polypropylene matrix, under the condition of lacking active chemical bonding response of a matrix side, long-lasting molecular-grade chemical anchoring cannot be established on a nonpolar polypropylene interface by virtue of process parameter regulation or ink formula optimization, the image-text layer is in a floating state substantially, and once the interface is subjected to wet-heat alternating environment or solvent erosion, the interface is extremely easy to fall off integrally due to insufficient bonding force. Therefore, how to enrich polar groups to the surface layer in the forming process through specific component design, and build a stable physical anchoring structure with a matrix crystal region, so that the water transfer adhesion reliability is improved on the premise of not reducing the impact toughness of a material body, and the method is a technical problem to be solved. Disclosure of Invention The invention provides a high interface affinity bionic polypropylene material for automobile interior trim, which is suitable for a water transfer printing process, and comprises the following components in parts by weight based on 100 parts by weight: 1.5 to 3.0 parts of a bionic interface coupling factor; Supplementing up to 100 parts of isotactic polypropylene matrix; wherein the isotacticity of the isotactic polypropylene matrix is greater than 96%, at 190 And a melt flow rate of 35g/10min to 45g/10min under a load of 2.16 kg; the bionic interface coupling factor is 140 of eicosanyl succinic anhydride, paraformaldehyde and polyamine compound The product generated by amidation reaction under the condition, and the mole fraction of catechol functional groups in the bionic interface coupling factor is 18 to 22 percent; The bionic interface coupling factor comprises a hydrophobic end formed by linear alkyl with a carbon chain length of 20 and a hydrophilic end containing catechol functional groups, wherein in the cooling process after injection molding of the material, the conformation of the linear alkyl is matched with the thickness of a crystal zone platelet of an isotactic polypropylene matrix, so that the bionic interface coupling factor is driven to migrate towards the surface of the material by utilizing the impurity removal effect in the crystallization process of the isotactic polypropylene matrix, the hydrophobic end is embedded into a crystal face gap at the edge of a spherical crystal of the isotactic polypropylene matrix, a cocrystal physical anchoring structure is formed between the hydrophobic end and the isotactic polypropylene matrix, and the catechol functional groups at the hydrophilic end are directionally distributed and fixed on the surface layer of the material, so that a catechol polar layer with solvent scouring resistance is formed on the surface of the material. Preferably, the molecular weight distribution index of the bionic interface coupling factor1.25 To 1.35, and the material is prepared by adding an isotactic polypropylene matrix and a bionic interface coupling factor into a homodromous double-screw extruder with the length-diameter ratio of 44:1, and the temperature of a machine barrel is 180 DEGTo 210And (3) carrying out melt blending under the condition of ensuring that the bionic interface coupling facto