Wear resistance methods of automobile guide groove sealing strips أداة الاختبار –

Methods for wear resistance of automobile guide channel sealing strips. Automotive glass guide channel seal strips generally need to be flocked or coated with an anti-friction coating on the glass sliding surface of the rubber seal strip to reduce slippage. glass. Friction resistance. The currently used automotive glass guide groove sealing strips often cause lint to fall off or the coating to wear due to glass friction, causing increased friction resistance, noise when the glass slides, ding marks. wear on the glass surface and damage to the sealing strip body. .

In order to improve the wear resistance of automobile U-shaped glass guide groove seal strips, through the research of materials, structures and technology processing, composite technologyRubber-plastic is used to seal the glass in a U-shaped guide groove. A layer of polyethylene (PE) material is attached to the bottom of the sliding surface of the strip as a wear-resistant layer to prolong the work. extends the service life of the automobile glass guide groove seal strip and improves work performance.
　
　1. Experience
　1.1 Raw materials
　Ethylene propylene diene rubber (EPDM), K8570C, K8550C, Lanxess, Germany; Nylon fluff, SWISS-3.3*0.5, SWISS Kunshan Co., Ltd.; flocking glue, FL852, LORD Chemical (Shanghai) Co., Ltd. ; high-density polyethylene (HDPE), a research institute in Guiyang. Other mixing agents are commercially available products.
1.2 Main instruments and equipment
The DIN wear resistance testing machine provided by Hengyu Instruments is suitable for testing the wear resistance of polyester soles,finished shoe soles, automobile guide duct sealing strips and polymer sheet materials, when the wear wheel rotates, the sample is rubbed with sandpaper of a certain grit to generate the amount of wear, thus evaluating its wear performance, which has high performance. Characterized by good reproducibility and ease of use.
1.3 Sample preparation and performance testing
1.3.1 Sample preparation
(1) Prepare modified polyethylene (PE) anti-friction layer material by modifying high-density polyethylene. First, HDPE is premixed with friction-reducing materials such as molybdenum disulfide and processing aids, and is grafted and modified with maleic anhydride using a twin-screw extruder under the initial action of the peroxide to ensure that it has both. It has good self-lubrication propertyés and can be mixed well with the rubber matrix.
(2) The automobile U-shaped glass guide groove sealing strip used in the test was prepared by the rubber composite sealing strip continuous production line of Micoro Company. Extrusion of the product was carried out using composite extrusion equipment. Rubber vulcanization was done by microwave vulcanization and hot air vulcanization. Passage completed. The surface flocking of the sealing strip is completed by an electrostatic flocking machine. Modified moLe PE composition and rubber adopt multi-channel design. Through the design of different channel flow rates and the control of the mixing channel, while controlling the speed and pressure of the extruder of Tianlang Company, the PE and rubber can be very uniform and close. bound together.
(3) The sample comes directlyent of U-shaped glass guide groove sealing strip product. Cut the flocking and PE parts on the sample to a length of 150~250mm and a width of the maximum width of the sample (16 mm), and take 3 pieces of each. The flocking part samples are coded A1, A2 and A3, and the modified PE part samples are coded B1, B2 and B3.
1.3.2 Performance test
Mainly based on GB/T 21282-2007 \"Rubber seal strips for passenger cars\", the wear resistance of the seal strip to U-shaped glass guide groove for automobile was tested and studied respectively. Wear resistance test comparison of flocking anti-friction layer and PEyer anti-friction layer of U-shaped glass guide groove seal strip for automobile. The schematic diagram of the wear resistance testing device is shown in fig.e 1. Table 1 illustrates the reciprocating stroke, reciprocating frequency, wear cycle period and constant load of the test. In this experiment, dry friction and wet friction methods were used to evaluate its wear resistance.
　
　2. Results and discussion
　　
　2.1. Product Structure
　 Figure 2 shows a schematic cross-sectional structure diagram of a U-shaped glass guide groove sealing strip for an automobile. The thick black lines in the figure (i.e. 12 and 14 in the figure) are the sliding friction areas of the glass. The bottom (12 in the figure) is in contact with the glass section and constitutes the main friction zone; the upper part (14 in the figure) is in contact with the plane of the glass. Non-major friction zone. According to the bench test and follow-up analysis of the actual use of the shaped glass channel sealing stripU of automobileps, the usual damage mode of automobile U-shaped glass channel sealing strips is mainly the wear of the anti-friction layer at the bottom.
Therefore, without changing the original transverse structural dimensions of the sealing strip, a modified polyethylene (PE) composite anti-friction layer was used to replace the flocking anti-friction layer in the main friction zone at bottom of the U-shaped glass channel sealing strip. Perform wear resistance comparison test.
2.2. Dry Rub Comparison Test
After placing the sample under standard laboratory environmental conditions (temperature: 23℃±2℃, humidity: 50%±5%) for 16 hours, perform dry rub test , the results are shown in Table 2. It can be seen from Table 2 that the friction resistance of the polyethylene (PE) composite antifriction layer modified (B1~B3) is equivalent to or lower than that of the flocking anti-friction layer (A1~A3), and the friction reduction effect is good. Most importantly, the PE sample showed almost no signs of wear after 50,000 friction cycles.
2.3. Wet Rub Comparison Test
After placing the sample under standard laboratory environmental conditions (temperature: 23℃±2℃, humidity: 50%±5%) for 16 hours, start testing the sample . Perform a wet rub test. During the test, first immerse the sample in clean water at 23℃±2℃ for 1 hour and remove it. Put the sample into the bench under humid conditions for testing. Keep the sample moist at all times during testing. Add 2 ml of water every 2000 frictions. clean water until the end of the test. The results are presented in Table 3. Table 3 It can be seen that the resistancee friction of the polyethylene (PE) composite anti-friction layer (B1~B3) is smaller (at least equivalent) than that of the flocking anti-friction layer (A1~ A3), and the friction reduction effect is good . It is worth noting that after 50,000 wet friction test cycles, the polyethylene (PE) composite anti-friction layer showed almost no signs of wear.
　
Conclusion:
　 (1) By modifying high density polyethylene (PE), a product that was self-lubricating (friction reducing properties) and well mixed with rubber was prepared. The modified PE material can be used as the anti-friction layer in the main friction area of ​​the U-shaped glass guide groove sealing strip of automobiles.
(2) Through research on the structure, materials and processing technology of automobile U-shaped glass guide groove sealing strip, without changing the size structurelle of the original cross section of the sealing strip, the bottom of the U-shaped sealing strip The sealing strip of the glass guide groove has been replaced. The flocked anti-friction layer in the main friction zone was replaced with a modified polyethylene (PE) composite anti-friction layer. Its wear resistance was three times higher than the previous one, thus achieving good results.

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