hpmc solution

What factors affect the light transmittance of hydroxypropyl methylcellulose

1. Refined cotton: Raw materials are an important factor affecting the light transmittance of hydroxypropyl methylcellulose. When good quality cotton grows, there is sufficient sunlight. The short fibers are thick, and there are few impurities during refining. Therefore, the light transmittance of the produced HPMC is high.

2. Concentration: The higher the concentration of HPMC solution, the lower its light transmittance.

3. Temperature: At normal temperature, the light transmittance of HPMC solution is high, but when the temperature rises, the light transmittance will decrease.

4. Dissolution time: HPMC is turbid when it is just dissolved, and the light transmittance will become higher and higher after 2-10 hours

5. Solvent: Different solvents have different effects on the light transmittance of HPMC solution. For example, water-soluble solvents (such as water and ethylene glycol) can increase the light transmittance of HPMC, while organic solvents (such as methanol and ethyl acetate) can reduce its light transmittance.

6. Processing technology: processing technology will also affect the light transmittance of HPMC. For example, HPMC produced cellulose films at high pressure with lower light transmittance than films produced at low pressure.

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