Tiantai Cellulose Co.,Ltd is Hydroxypropyl methyl cellulose HPMC manufacturer supplier factory producer China, with its high quality brand name QualiCell® Cellulose ethers.
A quick look at hydroxypropyl methylcellulose HPMC
One, what is the main use of hydroxypropyl methyl cellulose?
HPMC IS WIDELY USED IN BUILDING MATERIALS, coatings, synthetic resins, ceramics, medicine, food, textile, agriculture, cosmetics, tobacco and other industries. HPMC can be divided into industrial grade, food grade and pharmaceutical grade according to its use.
Two, hydroxypropyl methyl cellulose is divided into a few kinds, among which what is the difference?
HPMC can be divided into instant type (grade suffix “S”) and hot soluble type, instant products, in cold water quickly dispersed, disappear in the water, at this time the liquid has no viscosity, because HPMC is just dispersed in the water, no real dissolution. About (stir) for 2 minutes, the viscosity of the liquid slowly increases, forming a clear viscous colloid. Hot soluble products, in cold water, can be quickly dispersed in hot water, disappear in hot water, such as temperature down to a certain temperature (according to the gel temperature of the product), viscosity slowly appear, until the formation of transparent viscous colloid.
Three, hydroxypropyl methyl cellulose solution method has what?
1. All models can be added to the material by dry mixing method;
2, need to be directly added to the normal temperature water solution, it is better to use cold water dispersing type, after adding generally in 10-90 minutes to thicken (stirring, stirring, stirring)
3. The common model is first dispersed by stirring with hot water, and then dissolved by adding cold water after stirring and cooling.
4. If the caking and wrapping phenomenon occurs when dissolving, it is because the mixing is insufficient or the ordinary model is directly added to the cold water. At this time, it should be stirred quickly.
5. If bubbles are produced when dissolved, they can be left for 2-12 hours (the specific time is determined by the consistency of the solution) or removed by vacuum-extraction, pressurization and other methods, and an appropriate amount of antifoaming agent can also be added.
Four, how simple and intuitive to determine the stand or fall of hydroxypropyl methyl cellulose?
1, whiteness, whiteness although can not determine whether HPMC is good, and if it is added in the production process whitener, will affect its quality, but, good products mostly whiteness is good.
2, fineness: HPMC fineness generally 80 mesh and 100 mesh, 120 less, the finer the finer the better.
3, light transmittance: HPMC in the water, forming a transparent colloid, see its light transmittance, the larger the penetrability of the good, explain insolubles less inside, vertical reaction kettle by degrees generally good, will send some of horizontal reaction kettle, but cannot explain the vertical kettle production quality is better than lie kettle production, there are many factors that determine product quality.
4, the proportion: the greater the proportion, the heavier the better, than the major, generally because the content of hydroxypropyl is high, hydroxypropyl content is high, then the water retention is better.
Five, hydroxypropyl methyl cellulose in the amount of putty powder?
HPMC in the actual application of the dosage, by the climate environment, temperature, local calcium ash quality, putty powder formula and customer requirements of the quality of different, and there are differences around, generally speaking, between 4-5 kg.
Six, hydroxypropyl methyl cellulose viscosity is much better?
Be bored WITH CHILD POWDER IS GENERAL 100 THOUSAND OK, THE REQUIREMENT IN MORTAR IS SOME TALLER, WANT 150 THOUSAND TO JUST BE GOOD TO use, and, HPMC more important role is water retention, next is thickening. In putty powder, as long as the water retention is good, the viscosity is low (7-8), it is also possible, of course, the viscosity is larger, the relative water retention is better, when the viscosity is more than 100,000, the viscosity has little effect on the water retention.
Seven, what are the main technical indicators of hydroxypropyl methyl cellulose?
Hydroxypropyl content
Methyl content
viscosity
ash
Dry weight loss
Eight, what are the main raw materials of hydroxypropyl methyl cellulose?
HPMC’s main raw materials: refined cotton, chloromethane, propylene oxide, other raw materials, tablets of alkali, acid toluene.
Nine, hydroxypropyl methyl cellulose in the application of putty powder, the main role, whether chemical?
In putty powder, it plays three roles: thickening, water retention and construction. Thickening, cellulose can be thickened to play a suspension, so that the solution to maintain uniform up and down the same role, anti flow hanging. Water retention: make putty powder dry more slowly, auxiliary ash calcium reaction under the action of water. Construction: Cellulose has lubricating effect, can make putty powder has good construction. HPMC does not participate in any chemical reactions, only plays an auxiliary role.
Hydroxypropyl methyl cellulose is non-ionic cellulose ether, then what is non-ionic?
Generally speaking, inert substances do not participate in chemical reactions.
CMC(carboxymethyl cellulose) belongs to cationic cellulose, so encounter gray calcium will become bean curd slag.
11. What is the gel temperature of hydroxypropyl methylcellulose related to?
The gel temperature of HPMC is related to its methoxy content. The lower the methoxy content, the higher the gel temperature.
Twelve, putty powder powder and hydroxypropyl methyl cellulose do not have a relationship?
It matters!! HPMC is poor water retention, will cause powder.
13. What is the difference between the cold water instant solution and hot solution of hydroxypropyl methyl cellulose in the production process?
HPMC cold water soluble type is after glyoxal surface treatment, in cold water quickly dispersed, but not really dissolved, viscosity up, is dissolved. The heat-soluble type was not surface treated with glyoxal. The volume of glyoxal is large, the dispersion is fast, but the viscosity is slow, the volume is small, on the contrary.
14, hydroxypropyl methyl cellulose odor is how to return a responsibility?
HPMC produced by solvent method is made of toluene and isopropyl alcohol as solvent. If the washing is not very good, there will be some residual taste. (Neutralization recovery is the key process of odor)
15, different uses, how to choose the right hydroxypropyl methyl cellulose?
Putty powder: high water retention requirements, good construction ease (recommended grade: 7010N)
Ordinary cement based mortar: high water retention, high temperature resistance, instantaneous viscosity (recommended grade: HPK100M)
Application of building glue: instant products, high viscosity. (Recommended brand: HPK200MS)
Gypsum mortar: high water retention, medium and low viscosity, instantaneous viscosity (recommended grade: HPK600M)
16, hydroxypropyl methyl cellulose what is the alias?
HPMC or MHPC alias hydroxypropyl methyl cellulose, cellulose hydroxypropyl methyl ether.
Seventeen, hydroxypropyl methyl cellulose in the application of putty powder, putty powder bubble what reason?
HPMC in putty powder, play three roles of thickening, water retention and construction, the reason for bubble:
1. Too much water is added.
2. The bottom is not dry, on the top of another layer of scraping, also easy to bubble.
Eighteen, hydroxypropyl methyl cellulose and MC what is the difference:
MC is methylcellulose, which is made of refined cotton after alkali treatment and methane chloride as etherification agent through a series of reactions to make cellulose ether. Generally, the degree of substitution is 1.6-2.0, and the solubility of different degrees of substitution is also different, which belongs to non-ionic cellulose ether.
(1) The water retention of methyl cellulose depends on its amount of addition, viscosity, particle fineness and dissolution speed. In general, if the amount of adding is large, the fineness is small and the viscosity is large, the water retention rate is high. The amount of adding has a great influence on the water retention rate, and the viscosity is not related to the water retention rate. The dissolution speed mainly depends on the surface modification degree of cellulose particles and the particle fineness. In the above cellulose ether methyl cellulose and hydroxypropyl methyl cellulose water retention rate is higher.
(2) Methyl cellulose can be dissolved in cold water, hot water dissolution will encounter difficulties, its aqueous solution in the range of pH =3-12 is very stable, and starch, and many surfactant compatibility is good, when the temperature reaches the gelation temperature, gelation phenomenon will occur.
(3) The change of temperature will seriously affect the water retention rate of methyl cellulose, generally the higher the temperature, the worse the water retention. If the mortar temperature exceeds 40 degrees, the water retention of methyl cellulose will be significantly worse, seriously affecting the construction of mortar.
(4) Methyl cellulose has obvious influence on the construction and adhesion of mortar. Here, the adhesion refers to the adhesive force felt between the workers’ daub tool and the wall substrate, that is, the shear resistance of the mortar. The adhesive property is large, the shear resistance of mortar is large, and the force required by workers in the process of use is also large, so the construction property of mortar is poor.
Post time: Sep-07-2022