All Categories>
Sponge manufacturers tell you why sponge products turn yellow
Release time:
2020-11-03 12:03
Sponge manufacturers tell you why sponge products turn yellow:
① The yellowing caused by the contact of the sponge with ultraviolet light.
④ Textile environmental pollution caused by sponge.
And this yellowing is usually associated with the presence of antioxidants immediately. That is to say, the existence of antioxidants is not only likely to have a positive inhibitory effect on some yellowing above, for example, the thermal oxygen embrittlement and yellowing caused by high temperature in the foaming/production process of sponge polyurethane are suppressed by adding antioxidants in many ways. However, it is also likely to play a negative role in promoting the generation of other types of yellowing, such as: allylamine antioxidant touching nitrogen oxide (NOx, the key comes from exhaust emissions), or ultraviolet light, which will promote the yellowing of sponge. The antioxidant BHT is the key cause of textile environmental pollution.
As a manufacturer in the sponge sales market, when obtaining a polyether polyol, apart from considering the safety, cost and polyurethane foaming characteristics, it is very rare to comment on the influence of antioxidant management system in polyether polyol on the yellowing of sponge. This element, which is often overlooked by everyone, hides the key reason that harms the yellowing of sponge.
Generally in the idealized case, there are antioxidants in polyether polyols, in the sponge polyurethane foaming process, can give full play to suppress the high temperature caused by polyurethane foaming itself on the embrittlement and dissolution of polymers, not only to ensure the production safety of the whole process of sponge polyurethane foaming, but also to reasonably avoid the problem of core yellowing in the whole process of sponge polyurethane foaming. However, with the sponge polyurethane foaming, the residual antioxidants in the sponge are very easy to cause a lot of sponge yellowing problems.
Related News
How to identify natural sponge and artificial sponge?
Compared with artificial sponges, natural sponges do not have static electricity that hurts the human body, do not peel off and last long. The sponge that lives in the sea is the real sponge, and the artificial "sponge" just imitates the structure of the natural sponge. Natural sponges that live in seawater are mostly grayish yellow, brown or black lumps. Its body surface has many bulges, there are many small holes beside the bulge, and there is a large hole at the top of the bulge. Seawater flows in from small holes and out from large holes, and those tiny creatures enter the sponge with the water and become "self-contained" food. Therefore, although the sponge is called "the flowers and fruits of the sea", it looks like a plant, but it is actually an animal.
Buy a pack of large salt or coarse salt, put the coarse salt and dirty plush toys into a larger plastic bag, and then fasten the mouth of the bag tightly and shake it vigorously. You will surely find that the plush toys are clean. The crude salt removed became gray-black due to the adsorption of dirt. The principle is the use of salt that is sodium chloride adsorption of dirt. Soda powder can also be used instead of coarse salt, the same usage. This method is more suitable for large plush toys and plush toys that can not be washed with sound.
The main ingredient of the sponge?
Polyurethane soft foam rubber, polyurethane is one of the most common polymer materials in life, widely used in the production of various "sponge" products. Now there are three kinds of sponges on the market, 1: polyurethane type, burning to generate a large number of cyano-containing gases, these gases are very toxic and suffocating. 2: polyethylene type, combustion of carbon-containing gas, this kind of gas toxicity. 3: polystyrene type, this kind of foam burning decomposition of a small amount of styrene monomer, toxic, but not as toxic as polyurethane.
Sponge manufacturers analyze the performance of packaging sponge products into what
Sponge manufacturers analyze the performance of packaging sponge products into what?
What are the functions of the packaging sponge?
What is the function of packing sponge?
Sponge manufacturers take you to understand the main functions of sponge
What are the main functions of sponge manufacturers to take you to understand?
