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With the development of "three and three technologies", the trend of "lightweight and intelligent automobile" has been mentioned for two years. The lightweight of automobile is to reduce the body weight as much as possible on the premise of ensuring the strength and safety performance of automobile, so as to achieve the purpose of energy conservation and emission reduction. What are the benefits of lightweight for cars Experiments show that if the vehicle weight is reduced by 10%, the fuel efficiency can be improved by 6-8%; For every 100 kg reduction in vehicle curb weight, the fuel consumption per 100 km can be reduced by 0.3-0.6 L; The vehicle weight can be reduced by 1% and the fuel consumption can be reduced by 0.7%. How can lightweight improve safety performance? 1. The lightweight optimization design of automobile structure can reach…
Intermediates connecting the two materials mostly appear as water agents, which belong to fine chemical industry and have a wide variety. They are mainly classified by adhesive, physical form, hardening method and material of adherend. In short, three viscose, seven craft Precautions for adhesive selection1、 Storage period1. Each product has a storage period. According to international and domestic standards, the storage period refers to the condition of normal temperature (24 ℃). Acrylate adhesive is 20 ℃. 2. For acrylate products, the higher the temperature, the shorter the storage period. 3. For water-based products, if the temperature is below minus 1 ℃, it will directly affect the product quality. 2、 Intensity1. There is no universal adhesive in the world. For different adherends, it is best to choose special adhesive. 2. If the strength of the adherend itself is low, it…
（一）Concept of epoxy resinEpoxy resin refers to the general name of polymer compounds containing two or more epoxy groups in the polymer chain structure. It belongs to thermosetting resin, and the representative resin is bisphenol A epoxy resin. （二）Characteristics of epoxy resin (usually refers to bisphenol A epoxy resin)1. The application value of epoxy resin alone is very low. It needs to be used in combination with curing agent to have practical value. 2. High bonding strength: the bonding strength of epoxy resin is in the forefront among synthetic adhesives. 3. The curing shrinkage rate is small, and the shrinkage rate of epoxy resin adhesive is the smallest among adhesives, which is also one of the reasons for the high curing bonding of epoxy resin adhesive. For example: phenolic resin glue: 8-10%; Silicone resin adhesive: 6-8% Polyester resin glue:…