| 1. |
- Zhang, L., et al.
(författare)
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Method for prepn. of biological degradability regenerative cellulose waterproof film and cellulose products
- 1998
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Patent (populärvet., debatt m.m.)abstract
- A process for preparing water-proof regenerated cellulose film and water-proof cellulose products freatures use of biodegradable water-proof paint which is composed of pre-polymer of polyurthane, nitrocellulose, SO1-17 liquid, ethyl acetate and less N, N -dimethyl ethanolamine. Its technological steps include coating the surface of regenerated fibre film or cellulose product with and solidifying at 70-90 deg. C for 1-5 min. Obtained products have obviousely improved water-proof nature and tension strength over than 350 kg/sq. cm after immersed in water. The water vapour penetrating it is 0.004-0.005 g.sq. cm. d. It is fully biodegradable.
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| 2. |
- Zhou, Qi, et al.
(författare)
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Process for preparing hydroxy ethyl cellulose
- 2002
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Patent (populärvet., debatt m.m.)abstract
- The present invention discloses a new method for cellulose in NaOH / Urea homogeneous hydroxyethyl Preparation hydroxyethylcellulose. The method of the cellulose is completely dissolved in 6wt% sodium hydroxide / 4wt% aqueous solution of urea, and 2-chloroethanol with hydroxyethyl cellulose homogeneous reaction in the aqueous solution used successfully prepared water-soluble hydroxyethyl cellulose. No significant degradation of cellulose occurs in the course of the reaction. This is a new process for the preparation of hydroxyethyl cellulose, low cost, non-polluting, and high product purity, good uniformity.
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