1. Application and Preparation Brief:
The special material of polypropylene coating is mainly used for the coating of polypropylene woven bag and woven cloth. After coating, woven bags made of coating can be used directly without lining polyene bags. the strength and overall performance of the woven bag are improved because the polypropylene circulation film is directly coated on the woven bag, and the use is convenient, and the manufacturing cost is also reduced.

The State Building Materials Agency (National Building Materials Bureau) established the words & lt;1997>No.079 in November 1997, stipulating that laminated woven bags must be used for the packaging of cement and other products. At the same time, with the development of domestic packaging industry, the use range and dosage of paint grade PP gradually expanded. The original plastic manufacturer purchased the production line of plastic and woven composite bags, changed from the original PE inner bag PP woven bag to two-in-one cover bag and three-in-one paper plastic composite bag, and the market demand of grade PP is increasing day by day. Domestic paint grade PP supply is tight.
given the above, we based on general T30S and 2401(MFR =2~4 g /10min) and successfully developed special materials of coating grade (MFR =20~32 min, tensile strength 24.0 MPa) through controlled degradation after mixing.

During the development process, several experiments were carried out on the selection of molecular weight regulators and other excipients, the mixing and plasticizing of raw materials and the related process parameters. After optimized screening, the formulation and production process of PP coatings were determined. form a mass production line. satisfactory results have been obtained through many applications, which always reflect the stable quality of the product, good melt fluidity, uniform film formation, low shrinkage, high peel strength and high adhesion. 2. projected economic benefits:

The price of special materials per ton of coating is about 2,000 yuan higher than the price of raw materials. After deducting accessories, labor, utilities, mechanical depreciation and other expenses of 150 yuan, the net profit per ton of special materials is 1500 yuan. The annual output of the production line (calculated by extruder with screw diameter of 65) is 350-450 tons, and the annual net tax can reach more than 500000 yuan. if you use a large screw extruder, the productivity is higher. At present, China has more than 1000 large woven bag factories, villages and towns and private enterprises countless. The project has broad prospects.
Second, the preparation technology of polypropylene cooling masterbatch polypropylene cooling masterbatch is a polypropylene-based masterbatch, mainly used to reduce the temperature of polypropylene spinning and plastic products in processing, especially in polypropylene spinning excellent effect, but also used in the production of polypropylene blowing film, textile bags, monofilament, injection molding products have also received good results.
main performance index: add 1~5% cooling masterbatch to polypropylene resin for processing; can achieve the following points: all grades of polypropylene resin can produce high quality C round fine denier fiber. The spinning and plastic processing temperature can be reduced from 20°C to 50°CC; improve the quality of polypropylene fiber and plastic products; improve production efficiency; and reduce environmental pollution.

Scope of application: polypropylene spinning, polypropylene film blowing, polypropylene woven bags, monofilament