Polylactic acid/polypropylene cigarette composite tow with sheath-core structure and preparation method thereof

Abstract

The invention relates to a polylactic acid / polypropylene cigarette composite tow with a sheath-core structure and a preparation method thereof. The polylactic acid / polypropylene cigarette composite tow is prepared by a composite spinning technology in a melt spinning method, the section of a single prepared fiber is in a surface-core structure (the core is polypropylene, and the surface is polylactic acid), the linear density of the tow is 3.5-5.5 ktex, the monofilament linear density is 2-5 dtex, the crispation number is 18-28 / 25 mm, and the crispation index is about 0.55. Because the surface-core structure is adopted, the inside polypropylene is used as a skeleton, the composite tow can be crimped and processed for drying and shaping at the high temperature about 100 DEG C, and the cigarette tow with good crimping performance and physical and mechanical performance can be obtained; and in addition, the polylactic acid in the tow has the characteristic of biodegradation, and the environment pollution is reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of cigarette filter composite material and its preparation, and in particular relates to a skin-core structure polylactic acid / polypropylene composite tow for cigarettes and a preparation method thereof. Background technique [0003] Cigarette filter is an important part of cigarettes. It can filter, block and absorb tar in the smoke, reduce the harm of harmful substances in the smoke to the human body, and improve the quality of the smoke. There are two main types of cigarette filter materials currently on the market: cellulose diacetate and polypropylene tobacco tow. [0004] Cellulose diacetate fiber filter is a filter with excellent performance and wide application. Acetate molecules are composed of oxygen-containing ring structures connected by ether bonds, and the branch chains contain highly polar acetyl groups (-OCOCH 3 ) and hydroxyl (-OH), so the cellulose acetate tow has a strong affini...

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Problems solved by technology

[0008] Currently There have been several domestic patents on polylactic acid tow for cigarettes. In Patent No.: 200610131699.0 "A Cigarette Filter Tow and Its Preparation Method", the process and methods of spinning polylactic acid resin raw materials for polylactic acid tow are introduced. Method; In Patent No.: 200710055310.3 "A Filter Stick for Cigarettes and Its Preparation Method", it is introduced that the tow of polylactic acid cigarettes is prepared by opening, bonding, wrapping, cutting and post-processing to prepare filter sticks for polylactic acid cigarettes. method, but there are some unsolvable problems in these two patents

For example, in the process of spinning polylactic acid tow from polylactic acid resin raw materials, it is necessary to carry out crimping and drying and shaping processing at a high temperature of about 100°C to improve its crimping performance and physical and mechanical properties. The mechanical properties at high temperature are poor, the heat resistance stability is poor, and it cannot withstand high temperature processing, resulting in the deterioration of the performance of the spun polylactic acid tobacco tow. Therefore, under the same filter rod suction resistance, circumference and hardness requirements, More tow must be filled. Under the same conditions, compared with filter sticks made of cellulose diacetate and polypropylene tobacco tow, the weight of a single polylactic acid filter stick is 0.1 to 0.3 grams per piece, which is equivalent to The rod yield should be lower by 200,000 to 500,000 sticks / ton; this will also lead to problems such as increased consumption of auxiliary materials, increased packaging and transportation costs, and reduced economic benefits, which will have a relatively large impact on the application of polylactic acid tobacco tow in cigarettes. big limit

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