What are the reasons for the yellowing of the pu wire vacuum pipe?


Release time:

Apr 17,2023

I believe that many customers who use pu steel wire suction pipes know that after a period of use, the hose is yellow. Of course, Xiaobian once encountered the requirement that it must be yellow bottom when purchasing such a vacuum tube. Why? What? The customer responded that the yellow bottom is more like an imported dust pipe.

I believe that many customers who use pu steel wire suction pipes know that after a period of use, the hose is yellow. Of course, Xiaobian once encountered the requirement that it must be yellow bottom when purchasing such a vacuum tube. Why? What? The customer responded that the yellow bottom is more like an imported dust pipe.
 
What are the reasons for the yellowing of the pu wire vacuum pipe?
 
1. The ultraviolet radiation is mainly from sunlight. Therefore, especially in the face of the PU steel dust pipe that needs to be used outdoors, we will recommend the use of a certain amount of UV absorber material. Effectively absorbs ultraviolet rays and prevents yellowing of the PU suction pipe. Also, if the pu steel wire suction pipe ordered is not used, it should be placed in the dark room during storage. Pull the blackout curtains in the warehouse to avoid direct contact with the sunlight.
 
2. The oxidation of materials, the influence of heat and oxygen molecules, the application materials will undergo oxidation reaction over time, and the heat will accelerate the oxidation process of the materials. After the formation of the peroxidation structure, free radicals are easily formed, resulting in discoloration of the transparent, light-colored, white material. The destructive effect of oxygen on unsaturated diolefin materials is significant. In addition to the activation of oxidation, the action of heat can also cause the fracture of the -C-C bond and the rupture of the double bond to cause yellowing of the material.
 
The pu wire vacuum pipe is very transparent when it is just produced. After storage for a period of time, it will basically oxidize yellowish. The better the yellowing of the material, the less obvious, so when the goods received by the customer are sometimes compared Transparent, sometimes yellowish, this is not a quality problem, but a result of oxidation of the material. This does not affect the use at all.
 
Of course, the problem of yellowing the pu hose is not unsolvable. If it can solve this problem, it will increase the material cost a lot, and the customer will be difficult to accept. Therefore, the manufacturer has not changed the raw materials for this problem. .
 
Then, what should be done to solve the problem of yellowing of the pu wire vacuum pipe?
 
1. According to various characteristics of polyurethane raw materials, additives such as ultraviolet absorbers, antioxidants, stabilizers, etc. are considered in the product formulation.
 
2. Strictly control the quality of raw materials, and all technical indicators must meet the requirements for formulation.
 
3. The polyurethane tpu material should be strictly dried before processing.
 
4. The environmental control of the production process is in a reasonable temperature and humidity range.
 
Of course, the use of antioxidants and UV absorbers can not fundamentally solve the yellowing problem, but within a certain range and within a certain period of time, it can effectively prevent the oxidative yellowing of the pu wire vacuum tube products and maintain the product color. Transparent, improve the grade of the product.

 

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