| CAS No.: | 9004-65-3 |
|---|---|
| Formula: | C3h7o* |
| EINECS: | 618-389-6 |
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
1. Definition and Chemical Structure
HPMC is the abbreviation of Hydroxypropyl Methyl Cellulose. It is a non-ionic cellulose mixed ether. Chemically, it is formed by introducing methyl (-CH) and hydroxypropyl (-CHCH(OH)CH) groups into natural cellulose through chemical modification. The introduction of these groups alters the original properties of cellulose, endowing it with better water solubility and a series of other excellent properties.
2. Production Method** It is mainly produced by chemical processes such as alkalization and etherification, using natural cellulose (such as wood pulp or cotton pulp) as raw materials. Firstly, the cellulose raw material is treated under alkaline conditions to activate it, and then it reacts with methylating agents and hydroxypropylating agents. After a series of complex chemical reactions and post-treatment steps such as washing and drying, the HPMC product is finally obtained. Different production processes and reaction conditions can produce HPMC with different degrees of substitution (the degree of substitution of methyl and hydroxypropyl) and molecular weights, thus meeting different application requirements.
3. Wide Range of Application Fields
(1) In the Field of Building Materials** In cement mortar, HPMC serves as a water-retaining agent and a thickening agent. It can prevent water from evaporating too quickly, improve the water-retaining performance of the mortar, and enable the mortar to maintain good plasticity and adhesiveness for a long period of time. This is of great importance for improving the quality of building construction, such as tile pasting and wall plastering operations. In gypsum products, it can improve the fluidity and plasticity of the gypsum slurry, reduce the cracking phenomenon of gypsum products, and enhance their strength and toughness.
(2) In the Coatings Industry** It is used in water-based coatings as a thickening agent to regulate the rheological properties of the coatings. It can control the viscosity of the coatings, prevent the settling of pigments, and enable the coatings to be evenly distributed on the coated surface during the construction process (such as brushing and spraying), thereby improving the hiding power and adhesion of the coatings. Meanwhile, it can also enhance the stability of the coatings and extend their storage life.
(3) In the Pharmaceutical Field** In drug formulations, HPMC can be used as a binder and a disintegrant for tablets. It can bind drug powders into tablets, ensuring the strength of the tablets, and at the same time, it can regulate the disintegration speed of the tablets so that the drugs are released in the expected way inside the body. In addition, it can also be used to prepare sustained-release drug formulations. By controlling its content and properties in the formulations, the slow release of drugs can be achieved, reducing the frequency of drug administration and improving the patient's compliance with medication.
(4) In the Food Industry** As a food additive, HPMC performs multiple functions such as thickening, emulsifying, and stabilizing. In jelly, pudding and other gel-like foods, it acts as a thickening agent and a gel-forming agent, making the products form stable gel structures, and the consistency and taste of the products can be controlled by adjusting the amount of addition. In salad dressings, mayonnaise and other emulsion-like foods, it acts as an emulsifier and a stabilizer, preventing the emulsion from separating and maintaining the consistency of the appearance and taste of the products. In bakery products, it can improve the water-retaining property and softness of bread, cake and other products, and extend the shelf life of the products.
(5) In the Field of Daily Chemical Products** In cosmetics and personal care products, HPMC is used in various products such as face creams, lotions, and shampoos. In face creams and lotions, it acts as a thickening agent, making the products easier to apply and absorb, and preventing the emulsion from separating. In shampoos and other products, it can regulate the rheological properties of the products and improve the foam stability of the products.
4. Performance Characteristics** - Good water solubility: It can swell in water and form a transparent or semi-transparent viscous solution. Its dissolution speed is affected by factors such as temperature and particle size. - Strong chemical stability: It is stable under neutral and alkaline conditions, but hydrolysis reactions may occur under strongly acidic environments. - Excellent rheological characteristics: It has the characteristics of thickening, pseudoplasticity, and viscoelasticity. As a thickening agent, it can significantly increase the solution viscosity. Its pseudoplasticity makes the viscosity decrease and the fluidity improve when subjected to shear forces, and the viscosity recovers when the shear forces disappear. Its viscoelasticity enables it to have the ability to resist flow deformation and also a certain ability to recover elasticity. - Good biocompatibility: It has little irritation to human tissues and cells, is widely used in the pharmaceutical field, and is biodegradable to a certain extent.
| ITEM | SPECIFICATION | RESULT |
| Appearance | white or off-white powder ,no visíble evidence of contamination by foreign matter |
conforms |
| Identification | Conform | conforms |
| pH | 5.0-9.0 | 7.6 |
| Viscosity (NDJ, 2%,20°C) |
90,000-120,000mpa.s | 102800 |
| Viscosity (BROOKFIELD, 2%.20°C |
45,000-55,000cp | 50600 |
| Loss on Drying | Not more than 6.0% | 5.6% |
| Residue on Ignition | Not more than 5.0% | 3.7% |
| Particle size | Min 92% pass 80 mesh | conforms |
| Methoxy | 19.0%-24.0%CH30 Calculated on the anhydrous basis | 21.3% |
| Hydroxypropoxy | 4.0%-12.0% C:H,02 Calculated on the anhydrous basis | 10.7% |
){kind=link}