- Shangxian West Road, Xinsanban Industrial Park, Pingxiang Economic And Technological Development Zone, Pingxiang City, Jiangxi Province, China
- export@xt988.com
- +86-799-6611966
- export@xt988.com
- +86-799-6611966
In the production of polyurethane adhesives, paints, and coatings, the solvents, polyols, and other components need to be dried. If water is not removed from the oily two-component polyurethane, CO2 will be produced due to the reaction of water and isocyanate, causing foaming during curing, and eventually leading to the formation of carbon dioxide bubbles in the cured film, which not only causes bubbles of different sizes and pores, but also may reduce the gloss of the coating
This problem is quite prominent when spraying or paving polyurethane elastomers.
Water vapor or excessive stirring in the polyurethane construction environment will cause carbon dioxide gas to form pores in the coating.
Therefore, it is necessary to remove water from the polyurethane raw materials. Physical dehydration is a common process. Generally, oligomer polyols are dehydrated under reduced pressure at a high vacuum degree of 100-120°C for 1-2 hours to remove most of the water and meet the use requirements.
Xintao provides a new solution for the efficient dehydration of polyurethane, adding a certain proportion of activated molecular sieve powder to disperse in the polyurethane raw materials. Activated molecular sieve powder is a synthetic zeolite with a specific nano-scale pore size, which can selectively adsorb small molecule mixtures, including water molecules.
In a two-component polyurethane system, molecular sieves can be added to the polyol/isocyanate mixture. Depending on the different water content in the system, adding 2% to 6% is enough to remove residual water.
4A activated molecular sieve powder dehydrator can effectively remove moisture from polyurethane material, thereby preventing moisture from negatively affecting the polyurethane reaction process by bubbles, and at the same time improving the uniformity and strength of polyurethane. Its principle is usually to physically adsorb the moisture in the product during the polyurethane production process inside the molecular sieve pores through the pore size of the molecular sieve.
The pore size of Xintao’s 4A molecular sieve powder is 4 angstroms, which can adsorb small molecules smaller than its pore size, such as water molecules and carbon dioxide molecules. Since water molecules have a stronger polarity, molecular sieve preferentially adsorb water, which can replace the traditional dehydration process.
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Xintao 4a molecular sieve dehydrator has high adsorption capacity and is in great demand in the drying application sector. Conventional colloid dehydration or coating dehydration, as a dehydration additive for new materials, and additives in dynamic coating processes
Xintao has many export and customer service cases, you can learn about them here.
During the production of two-component polyurethane, bubbles are often generated due to the influence of moisture, which affects the product quality. The activated molecular sieve powder produced by Xintao has become a new choice
During the glue production and pouring process, the problem of colloid bubbles is often encountered. The bubbles in the colloid will affect the bonding effect between the glues, resulting in a shortened service life and even colloid separation. How do you solve this problem?
The performance of potting compound will be affected by moisture, including the moisture content of the potting compound itself and its ability to isolate moisture after sealing. Adding activated powdered molecular sieve can effectively solve the problem.
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