Use of lactide acid polymer

A technology based on polymers and lactic acid, which can be used in applications, food science, tobacco, etc., and can solve problems such as high breaking strength

Inactive Publication Date: 2006-08-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the elastic modulus of polylactic acid textile fibers is relatively high, and the breaking stren...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under the protection of high-purity argon, add recrystallized 8kg L-lactide and 4.0g stannous octoate (Sn(Oct) 2 ), after 3 times of vacuum / argon gas treatment, the temperature was raised to 120°C, and the reaction was carried out under stirring for 24h, maintaining the positive pressure of the system. The temperature was raised from 120°C to 160°C, and the reaction was continued for 48h. Then slowly raise the temperature to 200°C, driven by the nitrogen pressure (8-5MPa) of the steel cylinder, discharge the material from the outlet of the lower part of the polymerization kettle, water-cool granulation, and dry. The viscosity-average molecular weight of this polymer is 62,000, the melt flow index is 23g / 10min, and the strength of bonding at room temperature with glyceryl triacetate (lapping area 10×3mm 2 ) is 4.2MPa. The melting point measured by DSC method is 171° C., and the degree of crystallinity is 40%.

[0027] The polymer is spun on a φ25×25 melt spinning mach...

Embodiment 2

[0029] The reaction conditions in Example 1 were adopted, but the lactide used was prepared from 80% L-lactic acid aqueous solution, and the method was as follows: 9 kg of 80% lactic acid aqueous solution was heated, evaporated and dehydrated. Add 30g of stannous octoate after no water evaporates, raise the temperature to 150°C, carry out condensation reaction for 4 hours, collect the generated water, and dehydrate under reduced pressure for 2 hours. After no water condenses, reduce the pressure to 0.001MPa, raise the temperature to 180°C, carry out thermal cracking reaction, collect the condensed product lactide (140-150°C), and gradually increase the reaction temperature to 240°C. Stop the reaction when there is very little distillate, distill the lactide on another distillation device, and collect the fraction at 160-170°C. Distilled three times. The lactide thus obtained underwent a racemization reaction, and an estimated 4% of L-lactic acid was converted to D-lactic acid...

Embodiment 3

[0032] Under the protection of high-purity argon, 4600 g of recrystallized L-lactide, 400 g of ε-caprolactone, 2.0 g of stannous octoate and 2 L of toluene were added to a degassed 10 L stainless steel polymerization kettle, and after 3 After vacuuming / argon gas treatment for the first time, the temperature was raised to 110°C, and the reaction was carried out for 24 hours under stirring. The positive pressure of the system was maintained, and the temperature was raised to 140°C to stop stirring, and the reaction was continued for 24 hours. Then slowly raise the temperature to 180°C, and under the drive of the cylinder nitrogen pressure (5-3MPa), discharge the material from the outlet of the lower part of the polymerization kettle, and water-cool granulation. The polymer was dissolved with 10 times the volume of toluene, and the polymer was precipitated with 5 times the volume of ethanol of the toluene solution, washed and centrifugally dried 3 times. Finally, the polymer is e...

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Abstract

Use of lactate polymer is for filter tip material of cigarette, their molecular weight is between 5-200,000, smelting point is between140-170 degrees C, melt flowing index is 5-30g/10min at 190 degrees C and 2.16kg load, binding strength at room temperature is 4-12Mpa by triacetate glyceride. It has proper crystallinity, dissolubility, adsorptive performance and mechanical strength and can satisfy requirement of spinning, after-treatment and shearing.

Description

technical field [0001] The invention relates to the use of lactic acid polymers, in particular to the use of lactic acid polymers as raw materials for manufacturing cigarette tow, filter rods and filter tips. Background technique [0002] Cigarette filter is an indispensable part of cigarettes. It can filter, block and absorb harmful components in the breath, such as nicotine and tar. For a long time, two kinds of filter materials have been mainly used in the market, one is cellulose acetate fiber and the other is polypropylene fiber. Cellulose acetate is easily spun into fine denier fibers, and the bonding process from fiber to filter rod is relatively easy. The filter rod and filter tip made have superior comprehensive performance and are suitable for use in medium and high-end cigarettes. However, it uses high-quality perennial wood as raw material, and the process from wood to cellulose to cellulose acetate is accompanied by more pollution problems. Using dry spinning r...

Claims

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Application Information

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IPC IPC(8): C08G63/08A24D3/08
Inventor 景遐斌杨立新赵淑珍陈学思边新超
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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