How to solve the pu castor degumming, cracking and other phenomenon

There are all kinds of raw materials for the production of castor, the use of different kinds and functions are all different; And polyurethane material is one of them, we often call this kind of material to produce castor or PU polyurethane caster wheel; Material has good and bad, of course, also have good and bad points of production technology, different circumstances will produce different effects, how to solve this problem in addition to outside the material itself effort, production technology is also a key point. Polyurethane is introduced: polyurethane ( PU) Is made up of many isocyanate and polyether polyol or polyester polyols and/or small molecules polyols, chain extender agent such as multivariate amine or water, or crosslinking agent made from raw materials such as polymers. By changing the species and composition of raw material, can greatly change the product configuration and performance, get the final product from soft to hard. Understanding of pu castor material proficiency can help to find the problem in time for the production and processing, and to make corresponding responses. Pu castor production process note: 1, if discover to there is precipitation phenomenon, quantity should stir well before use, so as not to affect quality. 2, coating, become warped edge, the edge of the waterproof layer and partial brush on it, and the grass-roots stripping become warped edge. Main reason is the clean, or dry, closed operation is not careful, the seal is not good, become warped edge bottom coating adhesive power is not strong, etc. So at the grass-roots level to ensure clean, dry, to detailed operation. 3, the drum: grassroots have dusting, cracking, peeling, not dry, make coating bonding bad; Base construction should be carefully operation, maintenance, after being dry at the grass-roots level, besmear bottom coating first, after curing, again by the waterproof construction technology of layered coating; 4, porosity, bubble: material did not make the material mixing way and mixing time mixing evenly; Construction should be used when power, high speed but the blender. Another reason is basic level processing unclean, do clean up carefully before coating at the grass-roots level, can not have float sand and dust, more should not have hole in the grass-roots, coating layers appear porosity should be dealt with according to the technological requirements, prevent leakage of coating damage; 5, when paint viscosity is too large, the inconvenience for blade coating construction, can add a small amount of special thinner to dilute, in order to reduce the viscosity, add 10% of the quantity shall not be greater than b. Reasonable production technology can help us to produce high quality pu castor, and pu material as its main raw material for producing polyurethane casters, appropriate or in-depth understanding is an indispensable part of, so to solve a problem for the castor also need our understanding of it has enough.