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 Wysłany: Nie 7:21, 26 Gru 2010 Temat postu: christian louboutin pas cher Of aqueous acrylic po |
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Of aqueous acrylic polymer solution polymerization and the Causes of
Rounded up to l: 3, found in specific production ideal for this amount, the resulting polymer lighter in color, quality is better. 3. Polymerization temperature with polymerization temperature, the reaction energy increases, the reaction rate increased, decreased average molecular weight of polymer, polymer color deepened, as in solution polymerization, the reaction temperature can not be arbitrarily increased, if more than single Boiling Point (AN is 77,3 ℃, MA to 80 ℃), the single sharp gasification reactor pressure surge, the difficulties of production operations, but also make the production difficult to control, so I plant in accordance with years of practice, control of polymerization temperature 78 ~ 81 ℃, aggregate production has been relatively stable. In aqueous polymerization, select more appropriate 55C, the polymerization temperature is also due to the polymer particle size and slurry filter performance impact. 4. Polymerization time increased with reaction time, polymer molecular weight decreased, while the conversion rate has increased, but was almost unchanged by. However, reaction time is too short and does not make timely dissemination of heat of reaction, the conversion rate is low, is not conducive to polymerization. So I plant NaSCN solution polymerization, the polymerization time control in general 55 to 65 minutes; in the water phase polymerization. Control the reaction time was 54 minutes. 5. Poly sets the conversion rate in the acrylic fiber production, for the polymerization conversion rate control can be divided into low, medium and high conversion rates. Solution polymerization in our plant, the selection of the conversion rate of 65. This will take into account the conversion rate is too low residual single increase to increase the load off the single, but the ideal liquid obtained whiteness,[link widoczny dla zalogowanych], and the conversion rate is too high will cause the color yellow liquid. Timely and easy to use in the water together, the high conversion rate which reduces the load off the single, and the stock solution to achieve better whiteness, the conversion rate of the general control of the production of 856. Media PH value 6 (c / Beijing fiber socks 1999 1 Quality of DTY rate of dyeing Grade 7-5 Abstract: By the end of the text and operation of two aspects socks, socks quality of staining I_ such good sound. Keywords: Man = the amount of fish, fish, Mexican ± Zhuxi foreword by chemical fiber DTY deform thermoplastic processing, get a soft, natural sheen, warmth and good aspects of a variety of features to meet the needs of clothing , j one should. Despite the current rapid development FDY, DTY status but still can not be replaced, which is also small and medium enterprises engaged in chemical production and expansion of technical innovation competition on the occasion of new projects on the FDY DTY is still the backbone of the enterprise products as the reason. I'm Back in the acrylic fiber plant NaSCN solution polymerization, when the PH value of the media at 4 below, on the polymerization conversion and polymer average molecular weight of a great influence on the production of difficult to control, in medium PH value 4 ~ 9, impact on both small, so the production, polymerization media, the general control of PH value of about 5. precipitation polymerization in aqueous phase,[link widoczny dla zalogowanych], when Mrs PH value of 7, did not induce polymerization, only when the PH value of less than 4.5 can lead to polymerization, in the general control of the production value of 22 in PH. and the third monomer sodium methacrylate when used to control the PH value of good will can also be uniform polymer particle size slurry. 7 . molecular weight regulator in NaSCN solution polymerization, using isopropanol as a molecular regulator, because the molecule with primary hydrogen atoms attached to carbon atoms with high activity, easy and free radical effect growth of the macromolecular chain transfer, so that macromolecules stop growing, the increase in the amount of pulp with isopropanol, the reaction conversion rate remains unchanged, while the polymer molecular weight decline in reproduction in a small amount added to the system in a continuous, aqueous phase polymerization in the use of equipment-based ethanol as a molecular regulator , the same mechanism and isopropyl alcohol, the production capacity for controlling its accession to 3.90kg / h (tons of acrylic with an annual output of L dollars). 8, light-colored agent in NaSCN solution polymerization, the use of thiourea dioxide as a light-colored agent, the dosage is generally 1 single,[link widoczny dla zalogowanych], mechanism of action is its instability,[link widoczny dla zalogowanych], thermal decomposition of sulfuric acid and urea generation times, while the second sulfuric acid and oxidized to sulfite, sulfate and sulfite in the sub-ionized water, H, is conducive to stable reaction The PH value. which also increases the brightness of liquid. polymerization in water, using sodium bisulfite as a whitening agent, is ionized in the water because of its stable reaction system H. PH, in production control The addition is lOL / h (with an annual output of 10,000 tons acrylic dollars). In addition to these factors,[link widoczny dla zalogowanych], there are impurities in the organic monomer, NaSCN impurities, iron and other factors also affect the conversion rate and polymer average molecular weight. Lan, Conclusion The above acrylic fiber plant, and the aqueous solution polymerization polymer production factors were compared. as long as the production practice, strict control of process parameters, can produce qualified and quality products.
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