Sheath-core polylactic acid tobacco tow and filter stick and preparation method thereof

Abstract

The invention discloses a sheath-core polylactic acid tobacco tow and a filter stick and a preparation method thereof. A single fiber in the tow has a sheath-core structure consisting of an inner core and a sheath; main body resins of a sheath layer and a core layer are polylactic acid; the weight ratio of a sheath layer resin to a core layer resin is 20:80-40:60; the crystallinity degrees of the sheath layer and the core layer of the tow are 3-25 percent and 25-60 percent respectively; and the smelting points of the sheath layer and the core layer are 120-150 DEG C and 150-175 DEG C respectively. Compared with the prior art, the sheath-core polylactic acid tobacco tow has the greatest characteristics that the advantages of the core layer and the sheath layer are combined, high physical and mechanical properties and high heat resistance are provided by using the core layer, and high bonding property is provided by the sheath layer. A common plasticizing agent (such as glycerol triacetate) can be conveniently used for molding the filter stick. Moreover, the core layer and the sheath layer of the sheath-core polylactic acid tobacco tow provided by the invention have high biodegradability, and the sheath-core polylactic acid tobacco tow is an environment-friendly tobacco tow.

Description

[0001] technical field [0002] The invention belongs to the technical field of cigarette filter material and its preparation, and in particular relates to a skin-core type polylactic acid cigarette tow, a filter rod 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] The cellulose diacetate tow used for cigarette filters has excellent filtration and adsorption properties, and is easy to be bonded into a filter rod. The prepared filter rod has excellent overall performance, so it is widely used, accounting for more than 80% of the tobacco tow in the market . However, cellulose diacetate tow also has the following dis...

AI Technical Summary

Problems solved by technology

However, cellulose diacetate tow also has the following disadvantages: 1) The raw material for production is high-quality perennial wood, which is not self-sufficient in my country at present and mainly relies on imports, and the cost is relatively high; 2) The solution spinning method is used in the spinning process, which requires The use of a large amount of solvents not only increases the cost, but also inevitably causes pollution to the environment; 3) The degradation cycle is long. Compared with wood, the degradation performance of cellulose acetate tow is poor, and the pollution to the environment is gradually being paid attention to

However, there are obvious deficiencies in polypropylene tow for cigarettes: 1) There are no polar groups in the molecular structure of polypropylene, and the surface of the fiber is smooth and flat, so its adsorption performance on harmful components in smoke is poor; 2) The raw material of polypropylene is derived from petroleum, which belongs to Non-renewable resources, and difficult to degrade after use, easy to cause pollution; 3) Due to the non-polarity and high crystallinity of polypropylene, the bonding performance is poor, and the forming process of polypropylene tow filter rods is complicated

However, there are the following problems in the actual production and use process: 1) the heat resistance of the tow is poor; 2) the bonding performance and hardness of the filter rod are poor

Chinese patent 201210196240.4 discloses a skin-core polylactic acid / polypropylene cigarette composite tow and its preparation method. The inner core adopts a polypropylene skeleton, which improves the heat resistance and physical and mechanical properties of the tow, but the inner core The polypropylene used as raw material is non-degradable and easy to pollute the environment