Full-biological degradation nonwoven cloth material

Abstract

The invention relates to a total biodegradable non-woven fabric material which is produced by adding 10 to 40 percent of low molecular weight carbon dioxide-cyclohexene oxide copolymer or 10 to 40 percent of high molecular weight poly L-polylactic acid or 10 to 40 percent of poly-hydroxylic butyrate to biodegradable carbon dioxide-propylene oxide or carbon dioxide-epoxy ethane copolymer materials, thus improving the dimensional stability of the carbon dioxide copolymer under high temperature. The number average molecular weight of the carbon dioxide-cyclohexene oxide copolymer is between 4000 and 8000 and the number average molecular weight of the poly L-polylactic acid is above 100,000. By using the carbon dioxide copolymer material of the invention, manufacture can be carried out by adopting a spun-bond method which is commonly used in non-woven fabric manufacturing technique. The obtained non-woven fabrics can maintain dimensional stability at the temperature between 70 DEG C and 75 DEG C, have biodegradation characteristics under the situation of composts or landfill with carbon dioxide and water as degradation end products, and cannot pollute environment when being burnt.

Description

technical field [0001] The invention relates to a fully biodegradable non-woven fabric material. Background technique [0002] The demand and consumption of non-woven fabrics in the world are growing very rapidly, and it is expected to reach 4 million tons in 2007 from 2.4 million tons in 1997. Manufacturers of non-woven fabrics are mainly concentrated in the United States (accounting for 41% of the world), Western Europe accounts for 30%, Japan accounts for 8%, China's production only accounts for 3.5% of the world, but China's consumption accounts for 17.5% of the world . It is estimated that by 2007, China's output will reach 7% of the world's total, and its consumption will increase to 21% of the world's total. At present, man-made fibers still dominate the production of non-woven fabrics, and before 2007, this situation will not change significantly. 63% of the fibers used in the production of non-woven fabrics worldwide are polypropylene, 23% are polyester, 8% are v...

AI Technical Summary

Problems solved by technology

[0006] With 24.5kg of carbon dioxide-propylene oxide copolymer (number average molecular weight 87,000, 98wt%) and 0.5kg of maleic anhydride (2wt%) after internal mixer blending, pelletize by twin-screw extruder, dry After treatment, it is melt-extruded under the condition of 160-170°C, wherein the length-to-diameter ratio of the screw is 25:1. Through the processes of spinneret forming, stretching, splitting, netting, reinforcement, and curling, it can be prepared. Degraded non-woven fabric, but the non-woven fabric has a cold flow phenomenon at 30°C, and its dimensional stability is very poor after 40°C