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1, automotive industry introduction
Automotive industry is China's second largest industry after the real estate industry, but also China's largest industry, in a sense, the level of development of the automotive industry represents a country's industrial level. China is moving from a big auto country to an auto power, according to the China Association of Automobile Manufacturers statistics in 2014, China's auto production and sales are higher than 22 million units, is the world's largest country, under the leadership of foreign investment, joint venture brands, China's domestic brands are also developing rapidly. In terms of customer demand, safety, comfort, economy, aesthetics, fashion and so on have become consumer trends
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with the rapid development of China's auto industry and the improvement of Chinese s standard of living, China's auto market is booming, forming a strong competitive market, adequate supply. Therefore, people pay more attention to car safety, driving sense at the same time, pay more attention to indoor air quality, can not tolerate the irritating smell, pay more attention to the quality of life.
21st century, the three main themes of the automotive industry are green, lightweight and safe. Around the theme of green environmental protection, how to effectively control the car VOC has become a major automotive host plants, parts factories and raw material manufacturers focus on the subject. The control standard of automobile VOC has introduced some legal regulations and standards in our country. The promulgation of a series of regulations shows that our country's control of automobile VOC is becoming more and more specific and strict. Automotive interior with foam-backed vinyl, fabric and fiberboard and other hard substrate bonding, in the past has been using solvent-based adhesives, and solvent-based adhesives are one of the most important sources of VOC in the car, with the sound environmental regulations and people's environmental awareness, solvent-based automotive adhesives will gradually be replaced by environmentally friendly adhesives, especially water-based automotive adhesive promotion and application is imperative.
2, water-based polyurethane adhesive
water-based polyurethane adhesive refers to the car roof, floor, carpet, dashboard, door panel and other interior parts bonding, water as a dispersion medium, not only has close to solvent-based polyurethane adhesive excellent performance, but also non-combustible, non-toxic, pollution-free, is the world's growing environmental awareness of a new class of adhesive. Its spraying and other processing is convenient, thermally active at lower temperatures, has good bonding properties on the substrate, has a high initial bonding strength, a high final bonding strength, good moisture resistance, plasticizer resistance and heat resistance. Solvent-based adhesives have been used in the past, and solvent-based adhesives are one of the most important sources of VOC in cars, solvent-based automotive adhesives will gradually be replaced by environmentally friendly adhesives, especially water-based automotive interior adhesive applications. In addition, the two-component water-based polyurethane adhesive is also applied to the car armrests and other components of the cladding, the coating process requires the glue can quickly establish initial adhesion, to prevent stress, but at the same time requires a longer opening time after the hydrothermal reification, to adapt to the requirements of the longer operating time of the hand-wrapped edge, so the performance of the water-based polyurethane adhesive Higher requirements are put forward, the selection and matching of different polyurethane dispersions is essential to balance the overall performance
3, the characteristics of water-based polyurethane adhesives
compared with solvent-based polyurethane adhesives, water-based polyurethane adhesives have the following characteristics:
1, solvent-free, environmental protection, can provide a safer working and working environment.
2, low viscosity, and not with the polymer relative to molecular mass changes there are obvious differences, therefore, by improving the relative molecular quality of water-based polyurethane to improve its cohesion strength and initial adhesive strength, while solvent-based adhesive viscosity with the polymer relative to molecular mass increased exponential relationship, cross-linking easy to produce gels.
3, solid content can be as high as 35-40%, and most solvent-based polyurethane adhesives contain about 20%, and solvent-based viscosity with the increase in solid content and a sharp increase, compared to water-based polyurethane is easier to adjust the formulation.
4, for various substrates such as PC, ABS adhesion and solvent-based equivalent, but PP and other substrate bonding must do surface treatment.
5, the drying process is slower than solvent-based, energy consumption is greater.
6, low investment costs, no solvent recovery and fire and explosion-proof facilities.
4, conclusion
With the rapid growth of China's automotive industry, the industry upgrade of the automotive industry can not be separated from the replacement of supporting raw materials, automotive interior adhesives will inevitably usher in new opportunities and challenges, solvent-based polyurethane adhesive as a traditional non-environmentally friendly products will gradually be restricted and replaced, the future development direction of automotive interior adhesives is environmental protection, low VOC series of adhesives, water-based polyurethane automotive interior adhesive has broad prospects.