The reasons and precautions for the Automotive Wiring Harness Protection Sleeve to turn yellow and hard

During the production of Automotive Wiring Harness Protection Sleeve, a careless mistake may cause quality problems of Automotive Wiring Harness Protection Sleeve. Such as: the protective cover of Automotive Wiring Harness Protection Sleeve turns yellow and hard, the anti-aging performance is poor, and the elasticity and brittleness increase. The following editor will mainly talk about the reasons for the yellowing and hardening of the Automotive Wiring Harness Protection Sleeve and the matters to be paid attention to during production.

The yellowing and hardening of the Automotive Wiring Harness Protection Sleeve is mainly caused by aging. Controlling yellowing and hardening is the process of controlling aging. However, aging is divided into thermal aging, ozone aging, gas corrosion aging, heavy metal oxidation aging, reaction aging, ultraviolet aging, material aging, etc. pH imbalance and chain scission oversulfur will also cause product aging.
1. Look at the yellowing resistance of the raw materials themselves.
2. Matching of accelerator system: Accelerators can use DM and M to achieve yellowing level 4, but the whole system needs to be readjusted. The use of anti-yellowing accelerators is good for yellowing, but it will sacrifice a lot of physical properties and operation.
3. Control of hot pressing temperature: the temperature should not exceed 150 degrees, preferably below 140 degrees for better results. Otherwise, many materials are susceptible to heat aging.
4. The use of titanium dioxide: The use of titanium dioxide is to form a mirror reflection on the surface, so that ultraviolet rays cannot penetrate the Cable Sleeve. The finer the particle size of titanium dioxide and the greater the dosage, the better the anti-aging effect.
5. Control of heavy metals: Because if the content of heavy metals is too high, the heavy metals will oxidize and change color. Products are prone to yellowing.
6. Use of oil: less oil should be added, especially the chain-based ones should not be added to the general-purpose Cable Sleeve, because of poor compatibility, the oil will seep out of the surface and at the same time dissolve the additives in the oil etc. are also brought to the surface.
7. Adjustment of pH: The Cable Sleeve is slightly acidic, which will slightly inhibit the vulcanization reaction, but will control the intensification of chain scission.
8. The use of anti-aging agent: BHT has a good protective effect on thermal oxygen. SP will coordinate with MB production, and the effect is ideal. But the premise of use is that the quality of the material is excellent. Otherwise it will be counterproductive.