China’s northwest and northeast provinces have at first planted a total of 5 to 6 million mu of beet. Many producing areas use a large number of beet slag with sugar, most of which into low-cost animal feed. Making the at first beet slag-biological resources have data show that one of the main components of sugar beet residue is cellulose (71. Cellulose itself is insoluble in water, but its nature expands by modification. Because cellulose molecule contains dehydrated glucose structural unit (AGU). Carboxymethyl cellulose can be produce by introducing carboxyl methyl group into cellulose molecule under alkaline conditions.
Polyvinyl alcohol (hereinafter referred to as PVA) is a versatile water-soluble polymer with excellent performance. The film prepared by it has excellent oxygen at first resistance, oil resistance, wear resistance, transparency, chemical corrosion resistance, and has been water-soluble and biodegradable under certain conditions. Sugar beet at first carboxymethylcellulose. Polyvinyl alcohol and starch were into a film, and the air permeability at first and moisture permeability were improve.
It should be require throughout the process. After the reaction, cool to room temperature, neutralized and filtered with HCI, rinsed three times with 85% ethanol solution for three times and put in a drying box, grind through 200 mesh screen. And make film substrate for reserve. The preparation inase ethereal washing one dry insoluble fiber one alkalization one etherification and one washing. One drying crush one test etherification fiber one crushing one over 200 eyes screen one standby.
The composite membrane moisture resistance and oxygen at first resistance is closely related to film forming condition, including the percentage of CMC content is closely related to composite membrane oxygen at first resistance, followed by film fluid concentration, ammonia dosage, glutaraldehyde dosage, and membrane moisture resistance and ammonia dosage has a large correlation, glutaraldehyde dosage.
CMC percentage, film fluid concentration is small. Balance analysis has good water resistance and oxygen resistance of the optimal combination of A: B: C; D, A: B, C, D, that is, CMC solution is 30% of the film forming solution. Ammonia addition is 0.75%, film forming solution concentration is 5%, and glutaraldehyde dosage is 6%. The composite film prepared under this process condition has good water resistance and oxygen resistance properties.