02. Partikelstorlek; the pass rate of 100 mesh is greater than 98.5%; the pass rate of 80 mesh is greater than 100%.
Different, the solubility changes with the viscosity, the lower the viscosity, the greater the solubility, the performance of different specifications of hydroxypropyl methylcellulose (HPMC) has certain differences, the dissolution of hydroxypropyl methylcellulose (HPMC) in water is not affected PH value effect .
1. Hot water method: Since hydroxypropyl methylcellulose (HPMC) does not dissolve in hot water, the initial stage of hydroxypropyl methylcellulose (HPMC) can be evenly dispersed in hot water, and then when it is cooled, three A typical method is described as följer:
1). Put the required amount of hot water into the container and heat it to about 70°C. Gradually add hydroxypropyl methylcellulose (HPMC) under slow stirring, the hydroxypropyl methylcellulose (HPMC) starts to float on the surface of the water, and then gradually forms a slurry, cool the slurry under stirring .
2). Heat 1/3 or 2/3 (required amount) of water in the container and heat it to 70°C. According to the method of 1), disperse hydroxypropyl methylcellulose (HPMC) to prepare hot water slurry Then add the remaining amount of cold water or ice water in the container, then add the above-mentioned hydroxypropyl methylcellulose (HPMC) hot water slurry to the cold water, and stir, and then cool the mixture.
3). Tillsätt 1/3 eller 2/3 av den nödvändiga mängden vatten i behållaren och värm den till 70°C. According to the method of 1), disperse hydroxypropyl methylcellulose (HPMC) to prepare hot water slurry; The remaining amount of cold or ice water is then added to the hot water slurry and the mixture is cooled after stirring.
2. Powder mixing method: hydroxypropyl methylcellulose (HPMC) powder particles and an equal or greater amount of other powdery ingredients are fully dispersed by dry mixing, and then dissolved in water, then the hydroxypropyl methylcellulose Base cellulose (HPMC) can be dissolved without agglomeration . 3. Organic solvent wetting method: pre-disperse or wet hydroxypropyl methylcellulose (HPMC) with organic solvents such as ethanol, ethylene glycol or oil, and then dissolve it in water. At this time, hydroxypropyl methylcellulose ( HPMC) can also be dissolved smoothly.
1). Lim och tätningsmedel för gipsbaserad tejp;
2). Limning av cementbaserade tegelstenar, kakel och fundament;
3). Stuckatur baserad på gipsskivor;
4). Cementbaserad strukturgips;
5). I formeln för färg och färgborttagningsmedel.
Posttid: 24 maj 2023