Detailed analysis: Car dashboard materials and manufacturing processes (Figure)
With the car in a safe and environmentally friendly development, the people of the Automotive Trim in safety and environmental protection requirements have become more sophisticated; with the instrument panel shape design aesthetic requirements, more and more of the instrument panel seamless airbag door designs, so the car dashboard, the dashboard, not only have a good modern design and beautiful shape, comfortable handle, and needs to have good aging properties and good compatibility with passengers (excellent distribution characteristics).
As PVC Material has good feel and shape of patterns and materials, low cost, so the current PVC slush is still the most widely used instrument panel skin processing, PVC powder slush molding process accounts for most of the market. As the glass transition temperature of PVC materials, higher material in low temperature brittle and easy to create a seamless dashboard airbags in low temperature blast, fragmentation and the balloon flew regional PVC skin, produce safety hazards to passengers, PVC in the anti- aging, Plasticizer Migration and so there is a problem, so for safety and environmental reasons, the host, accessories and materials manufacturers have developed a PVC alternative materials and processes.
Thus, with the increasing requirements of environmental protection, and poor environmental compatibility of materials will gradually be replaced. In the future, the dashboard surface materials will continue to improve in the following performance: excellent safety performance, low temperature performance; excellent aging properties, anti-UV properties; easy to recycle; reduce the fog of; material soundness, and the environment and human compatibility.
Performance under the instrument panel skin requirements of these developments, the world's host, accessories and materials manufacturers continue to develop new materials and molding process to meet the performance requirements of the development epidermis, the following would be the dashboard facing some of the properties of epidermal excellent new material and molding process are introduced.
Slush molding process Slush process is currently a mature and widely used in the molding process, the metal forming process is simple, is the most widely used technology. Dermatoglyphics slush mold currently available to more and more widely, such as sewing thread (StitchLine), a major new environmental protection materials are thermoplastic polyolefin (TPO), thermoplastic polyurethane ( TPU ) Powder.
1. Thermoplastic polyurethane TPU Thermoplastic polyurethane TPU combines the physical and mechanical properties of rubber, thermoplastic and technology with excellent processability. The advantages are: an environment-friendly materials can be recycled; has good mechanical properties, use the thinner skin thickness; good chemical resistance, aging resistance, wear resistance; TPU plastic sugar no need to add the plasticizer, which has a good smell and the distribution of property; excellent low temperature performance, at low temperature to maintain a good flexibility, glass transition temperature is -50 .
TPU slush powder divided two kinds, one is aromatic polyurethane and the other is aliphatic polyurethane. Aromatic isocyanates from aromatic polyurethane MDI And polyether component, aliphatic polyurethane by the aliphatic isocyanates such as HDI, IPDI and Polyester Polyether or acrylic composition. As the aromatic isocyanate exists unsaturated bonds, easy to produce yellow and pink phenomenon, the early use of the aromatic TPU slush spray on skin surface coating required to prevent skin turn yellow. At present the development of TPU slush powder systems are generally aliphatic, aliphatic polyurethane has excellent UV resistance, light resistance, there is no need for spraying on the skin surface, but the aliphatic TPU general processing performance and cost are affected TPU material promoted. As the aliphatic TPU excellent lightfastness and comfortable feel, its high-end products should be in a better application.
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