What is the main use of hydroxypropyl methylcellulose?
——Answer: HPMC is widely used in construction materials, coatings, synthetic resins, ceramics, medicine, food, textiles, agriculture, cosmetics, tobacco and other industries. HPMC can be divided into construction grade, food grade and pharmaceutical grade according to the purpose. At present, most of the domestic products are construction grade. In construction grade, putty powder is used in a large amount, about 90% is used for putty powder, and the rest is used for cement mortar and glue.
How to distinguish the quality of HPMC simply and intuitively?
——Answer: (1) Whiteness: Although whiteness cannot determine whether HPMC is easy to use, and if whitening agents are added during the production process, it will affect its quality. However, most of the good products have good whiteness. (2) Fineness: The fineness of HPMC generally has 80 mesh and 100 mesh, and 120 mesh is less. Most HPMC produced in Hebei is 80 mesh. The finer the fineness, generally speaking, the better. (3) Light transmittance: put hydroxypropyl methylcellulose (HPMC) into water to form a transparent colloid, and look at its light transmittance. The greater the light transmittance, the better, indicating that there are less insolubles in it. . The permeability of vertical reactors is generally good, and that of horizontal reactors is worse, but it does not mean that the quality of vertical reactors is better than that of horizontal reactors, and product quality is determined by many factors. (4) Specific gravity: The larger the specific gravity, the heavier the better. The specificity is large, generally because the content of hydroxypropyl group in it is high, and the content of hydroxypropyl group is high, the water retention is better. (5) Burning: Take a small part of the sample and ignite it with fire, and the white residue is ash. The more white substance, the worse the quality, and there is almost no residue in pure goods.
What is the price of hydroxypropyl methylcellulose?
—–Answer; the price of hydroxypropylmethyl depends on its purity and ash content. The higher the purity, the less the ash content, the higher the price. Otherwise, the lower the purity, the more ash content, the lower the price. Ton to 17,000 yuan per ton. 17,000 yuan is a pure product with almost no impurities. If the unit price is higher than 17,000 yuan, the profit of the manufacturer has increased. It is easy to see whether the quality is good or bad according to the amount of ash in hydroxypropyl methylcellulose.
What viscosity of hydroxypropyl methylcellulose is suitable for putty powder and mortar?
—–Answer; putty powder is generally 100,000 yuan, and the requirement for mortar is higher, and it needs 150,000 yuan to be easy to use. Moreover, the most important function of hydroxypropyl methylcellulose is water retention, followed by thickening. In putty powder, as long as the water retention is good and the viscosity is low (70,000-80,000), it is also possible. Of course, the viscosity below 100,000 is higher, and the relative water retention is better. When the viscosity exceeds 100,000, the viscosity has an effect on water retention The impact is not great.
Post time: Nov-21-2022