The development prospect of modified polypropylene plastics is broad

In the early 1990s, the United States proposed an advanced solid phase graft modification method, and has developed related products, such as chlorinated modified PP (MCPP) resin produced by Eastman Company, which sells up to 10,000 tons per ton in the Chinese market. More than 50 million yuan. Modified PP (MPP) and MCPP are special materials for special PP, which greatly expands the application range of PP and has great economic benefits. The isotactic PP is modified by solid phase grafting to obtain MPP, and then the MPP is chlorinated to obtain MCPP solid powdery resin. The chlorinated modified resin has strong adhesion, improved flexural modulus, and is easy to be blended with other resins; and the modification causes the crystallization of PP to be destroyed, the polarity is increased, and thus it is soluble in some solvents, and the difference is made. Concentration of MCPP solution.

There are four main aspects to the use of MPP. The first is to improve the impact resistance of engineering plastics. Using MPP as a compatibilizer, the blend of PP and other plastics has a 2 to 3 times higher impact strength and can be used as an impact resistant shell material. The second is Dexpro alloy developed by exfer plastics, which is polyamide and The alloy of PP in the presence of compatibilizer has been commercialized; the third is used as a thermoplastic powder coating for the surface of metal substrates to protect against chemicals and chemicals. Japan's Nozagl-GIZ brand is an alloy material of PP and nylon. It has high chemical and oil resistance, especially excellent resistance to potassium chloride. Thirdly, it improves the adhesion of PP filler. The introduction of MPP can improve the compatibility of filler with PP, improve the performance of composites, improve the overall thermal stability and local heat resistance of the material; fourth, MPP is also applied to the curing of free radical active waste. In addition, MPP can also be used to improve the dyeability of PP fibers and the decoration of plastic products, to manufacture retortable packaging materials and the like.

From the market point of view, the annual total demand for domestic PP is more than 3.5 million tons, of which PP special materials are more than 1 million tons. The requirement of grafting modified PP is 100,000 tons/year. It is mainly used for blending with other polymer materials such as nylon, polycarbonate, rubber, etc. to prepare new polymer materials; adding fillers such as inorganic powders, Glass fiber, natural fiber, etc., to prepare high-strength PP; further processed products for powder coatings, liquid coatings, etc. At present, China's isotactic PP solid phase grafting modification method is still blank. No such products are put into the market. The required vacancies mainly depend on imports. The price of modified PP products promoted by German Hoechst Company in China is 15000~18000 yuan. /year.

The main uses of MCPP are as follows: First, adhesion promoters for preparing primers for plastic products and decorative coatings for plastic surfaces, especially for civil and industrial plastic appliances such as car bumpers, hub caps, and television casings. Second, it is widely used as a printing ink resin for plastic surface; third is used as anti-corrosion coating resin for heavy anti-corrosion materials such as steel butadiene and aluminum.

With the extensive use of plastic products, people are paying more and more attention to the decoration of plastic surfaces. However, due to the low surface energy of plastic products, there are problems such as poor adhesion and difficulty in direct coating and coating. Usually, the surface of the plastic needs to be surface treated first before painting. There are two main methods. First, surface treatment is carried out by flame, corona discharge, gas plasma, etc. The difficulty of this type of technology is that it is necessary to form a uniform surface and not to deal with excessively, otherwise the polymer chain of the surface will be broken, thereby affecting the performance of the material. The second is surface treatment with a surface primer, of which chlorinated polyolefin (CPO) is an ideal primer resin, which can be used to prepare a primer for improving adhesion or as an adhesion promoting additive.

The surface coating demand for plastic parts for MCPP resin vehicles is 500 tons/year. The demand for metal surface anti-corrosion coatings exceeds 200,000 tons. In terms of printing inks, the current market demand is more than 500 tons/year. At present, Guangzhou Zhujiang Electrochemical Plant adopts solid-phase suspension chlorination method to produce unmodified chlorinated PP, with a production capacity of 30,000 tons/year. The products are very popular and the price is about 35,000 yuan/ton. The MCPP solid material produced by Eastman Company of the United States has a domestic price of up to 500,000 yuan/ton, and the price of 50% of MCPP solution is about 270,000 yuan/ton. As a functionalized product of PP, PP modified products can greatly expand the application field of PP, and have a wide market and application prospects, which is worthy of vigorous development.