Compound type automobile interior trim and preparation method thereof

Abstract

The invention discloses a compound type automobile interior trim and a preparation method thereof. The compound type automobile interior trim provided by the invention consists of three layers of materials, wherein a plastic suction forming layer is arranged on the surface, a spraying type semi-rigid polyurethane foam layer is arranged at the middle, and a polyurethane reaction injection forming material layer is arranged at the bottom. In the plastic suction forming step on the surface, the moulds with different shapes can be used according to the requirements of different products, the materials with different hardness are selected, and the surface of the automobile interior trim product with pattern can be formed according to the mould design. The polyurethane spraying foam composition used in the polyurethane foam spraying forming process has two components, and the spraying is performed on a two-component spraying machine. After the second step is finished, the third step of performing the enhanced polyurethane reaction injection forming technology can be immediately performed without the steps of demoulding, post-curing and the like. According to the invention, the product does not protrude or deform easily, and has surface elasticity, relatively good handfeael and high product grade.

Description

technical field [0001] The invention belongs to the field of polyurethane and composite materials thereof, and in particular relates to a production process of automobile interior trim parts compounded by various materials such as polyurethane, PVC, ABS and glass fiber. Background technique [0002] With the development of the automobile industry, the requirements for automobile safety, lightweight, environmental protection and energy saving are getting higher and higher. Therefore, materials with high performance and low density have always been the research direction of the automobile industry. High-performance polymer materials, especially polyurethane materials, are more and more widely used in automotive parts due to their good performance, low density, and strong designability. Among them, they can be used in automotive soft foam in interior parts. Plastic seat cushions, headrests, pillows, steering wheels, dashboards, luggage, roof linings, door inner guards, etc. Am...

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Problems solved by technology

This composite material production method is advanced to a certain extent, but there are still some problems in actual production: 1. During the process of manufacturing the inner core using polyurethane reaction injection molding technology, the polyurethane two-component material undergoes polymerization reaction in the mold cavity after mold closing , because the polyurethane polymerization reaction is an exothermic reaction, it will generate a certain amount of heat and pressure. The increase in temperature and pressure will easily cause adverse effects on the thermoplastic skin material, which will cause the skin to become thinner and the pattern to become lighter or disappear. In severe cases, it may cause The whole product is scrapped; 2. When the glass fiber bundles and polyurethane reactive materials are mixed and poured on the surface of the plastic-forming skin, if the mixture of the former two is slightly uneven, it is easy to retain air bubbles. The product is bulging, leading to the scrapping of the product, and when this problem occurs on the vehicle that has been applied, it will cause adverse effects on the manufacturer. Therefore, the production of qualified products has extremely strict requirements on the fluidity of polyurethane materials and the wettability of glass fibers. Requirements; 3. Although the automotive interior parts produced have the characteristics of light weight and high performance, because the inner core material used is a composite of polyurethane rigid foam and glass fiber, the product has high hardness, lack of elasticity, and poor surface feel , generally not accepted by high-end cars

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