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HPMC is usually made from refined cotton or wood pulp through alkalization and etherification reactions. The etherification process needs to be carried out under controlled temperature and pressure to ensure the completeness of the reaction and the consistency of the product. The common reaction temperature range is 50°C to 100°C, and the reaction time is 1 to 5 hours.

In the PVC production process, hydroxypropyl methylcellulose (HPMC) is a key additive with a viscosity range of 1000 to 200000 mPa·s (measured in 2% aqueous solution). It is mainly used for suspension polymerization and improving material properties.

In PVC suspension polymerization, the amount of HPMC usually accounts for 0.025% to 0.03% of the PVC output, and its dispersion properties directly affect the thermal stability, particle size distribution and final product quality of the PVC resin.

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