What is the main use of Hydroxypropyl Methyl Cellulose?
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HPMC is widely used in building materials, coatings, ceramics, cosmetics, pharmaceuticals, food and other industries.HPMC can be divided into industrial grade, food grade and pharmaceutical grade according to its use.
What are the main technical indexes of Hydroxypropyl Methyl Cellulose?
Hydroxypropyl content, methyl content, viscosity, ash content, and loss of dryness.
How many kinds of hydroxypropyl methylcellulose are there and what is their difference?
HPMC can be divided into instant and hot soluble types. The instant product, meet cold water quickly dispersed, disappeared in the water, at this time the liquid has no viscosity, because HPMC is only dispersed in the water, not really dissolved. At this time, the liquid has no viscosity, because HPMC is just dispersed in the water, not really dissolved. After about 2 minutes of stirring, the viscosity of the liquid will slowly become bigger, and it will form a transparent white sticky gel. Hot soluble products, cold water clumping, can be in hot water, quickly dispersed, disappear in hot water, and so the temperature drops to a certain temperature (according to the gel temperature of the product), the viscosity slowly appears until the formation of transparent viscous colloid.
What are the dissolving methods of hydroxypropyl methyl cellulose?
(1) All models can be added to the material by dry mixing method;&#;
(2) When it needs to be added directly into room temperature water solution, it is better to use cold water dispersion type, which can be thickened in 10-90 minutes after adding;
(3) Ordinary type can be dissolved after stirring and dispersing with hot water first, and then adding cold water for cooling;&#;
(4) If lumps occur when dissolving, it is because of insufficient mixing or the ordinary model is added directly into the cold water, then it should be stirred quickly.&#;
(5) If bubbles are generated when dissolving, they can be removed by standing for 2-12 hours (the specific time is determined by the consistency of the solution) or by vacuuming or pressurizing, or by adding appropriate amount of antifoam agent.&#;
How to determine the good or bad of hydroxypropyl methylcellulose simply and intuitively?
(1) Whiteness: although whiteness can not decide whether HPMC is good or not, and if the whitening agent is added in the production process, it will affect its quality, but most of the good products have good whiteness.
(2) fineness: HPMC fineness generally have 80 mesh and 100 mesh, 120 mesh is less, the finer the finer the better.
(3) Transmittance: HPMC into the water, the formation of transparent colloid, look at its transmittance, transmittance, the greater the better, that is, less insoluble matter inside, vertical reactor through the degree of generally good, horizontal reactor to be poorer, but does not indicate that the quality of vertical kettle production than the production of horizontal kettle, product quality, there are a lot of factors to decide.
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(4) Specific gravity: the greater the specific gravity, the heavier the better, than the major, generally because of the high content of hydroxypropyl inside, hydroxypropyl content is high, the water retention to be better.
How much viscosity of hydroxypropyl methylcellulose is suitable?
Putty powder generally with 100,000 viscosity can be, mortar requirements of higher, to 150,000 viscosity is good to use, and, HPMC is more important role is water retention, followed by thickening. In putty powder, as long as the water retention is good, lower viscosity (70,000-80,000) is also possible, of course, the viscosity of the greater water retention to be relatively better, when the viscosity of more than 100,000 viscosity, viscosity on the water retention of the impact is not great.
Recommended reading: hpmc grades viscosities
HPMC, or hydroxypropyl methylcellulose, is a chemical compound commonly used in a variety of industries, including pharmaceuticals, cosmetics, and construction. Here are some frequently asked questions about HPMC:
What is HPMC?
HPMC is a synthetic polymer made from cellulose, a natural substance found in plants. It is created by chemically modifying cellulose with methyl and hydroxypropyl groups to produce a water-soluble powder.
What are the uses of HPMC?
HPMC has a variety of uses in different industries. In the pharmaceutical industry, it is used as a binder, thickener, and emulsifier in tablets, capsules, and ointments. In the cosmetics industry, it is used as a thickener, emulsifier, and stabilizer in creams, lotions, and makeup. In the construction industry, it is used as a binder, thickener, and water retention agent in cement and mortar.
Is HPMC safe?
HPMC is generally considered safe and non-toxic. It is widely used in the pharmaceutical and cosmetic industries, where safety and purity are essential. However, as with any chemical, it is important to handle HPMC with care and follow proper safety precautions.
Is HPMC biodegradable?
HPMC is biodegradable and can be broken down by natural processes over time. However, the rate of biodegradation depends on various factors, such as temperature, humidity, and the presence of microorganisms.
Can HPMC be used in food products?
HPMC is not approved for use in food products in some countries, including the United States. However, it is approved for use as a food additive in other countries, such as Japan and China. It is used as a thickener and stabilizer in some food products, such as ice cream and baked goods.
How is HPMC made?
HPMC is made by chemically modifying cellulose, a natural substance found in plants. The cellulose is first treated with an alkali solution to remove impurities and make it more reactive. Then, it is reacted with a mixture of methyl chloride and propylene oxide to produce HPMC.
What are the different grades of HPMC?
There are several grades of HPMC, each with different properties and characteristics. The grades are based on factors such as molecular weight, degree of substitution, and gelation temperature. The different grades of HPMC are used for different applications in various industries.
Can HPMC be mixed with other chemicals?
HPMC can be mixed with other chemicals to produce different properties and characteristics. It is commonly used in combination with other polymers, such as polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG), to enhance its binding and thickening properties.
How is HPMC stored?
HPMC should be stored in a cool, dry place away from moisture and direct sunlight. It should be kept in a tightly sealed container to prevent contamination.
What are the advantages of using HPMC?
The advantages of using HPMC include its versatility, water-solubility, and biodegradability. It is also non-toxic, stable, and compatible with a wide range of other chemicals. Its properties can be easily modified by changing the degree of substitution and molecular weight, making it suitable for a variety of applications.
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