Application analysis of the special compatibilizer

2022-08-13
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Application analysis of special compatibilizers for wood plastic materials

at present, countries all over the world have carried out comprehensive treatment of various waste plastic pollution, and have achieved certain results. Among them, plastic wood products filled with wood powder or plant fiber, extruded, pressed or injection molded by special equipment, can be used to replace wood products in some occasions, which is particularly practical. This achievement is a practical new technology with rapid development and significant economic benefits abroad in recent years. It can be widely used in packaging, construction and other industries. The products can be made into plates, profiles, sheets, pipes, etc., and have the advantages of wood processing

The development and research of wood flour and waste plastic composites can not only provide opportunities to make full use of natural resources, but also reduce environmental pollution caused by waste plastics. Therefore, this kind of plastic wood composites is a green environmental protection material that saves energy and protects the environment. It is also widely used, mainly in building materials, automobile industry, packaging and transportation of goods, decorative materials and daily necessities, and has broad prospects for development. As an organic filler of plastics, wood flour has many excellent properties that other inorganic fillers cannot match: wide sources, low price, low density, good insulation, and little wear on processing equipment. However, it is not widely used like inorganic fillers, mainly because of poor compatibility with matrix resin, poor dispersion effect in molten thermoplastic, poor fluidity, and difficult extrusion processing

with the continuous development of plastic wood technology and the increasing demand for environmental protection, plastic wood technology has shifted from the production of plastic wood products by mixing single component waste plastics and wood flour to the production of plastic wood products by blending multi-component waste plastics and wood flour compared with traditional equipment. In this way, the compatibility between multi-component waste plastics becomes very heavy to avoid rusting

as the main component of wood flour is cellulose, cellulose contains a large number of hydroxyl groups, which form intermolecular hydrogen bonds or intramolecular hydrogen bonds, so that wood flour has water absorption, the moisture absorption rate can reach 8%~1, and the ability to deal with trade protectionism can be enhanced by 2%, and the polarity is very strong; Most thermoplastics are non-polar and hydrophobic, so the compatibility between them is poor and the interfacial adhesion is very small. Using appropriate additives to modify the surface of polymer wood flour can improve the interfacial affinity between wood flour and resin, and the modified wood flour filler has enhanced properties, which can well transfer the stress between filler and resin, so as to enhance the strength of composite materials. Therefore, in order to obtain plastic wood composites with excellent properties and meet the conditions, the first thing to be solved is the problem of material compatibility

the compatibility problem is mainly solved by adding various additives

(1) coupling agent method

coupling agent can improve the compatibility between inorganic filler, inorganic fiber and matrix resin, and also improve the interface between wood flour and polymer. Silane coupling agent and titanate coupling agent are the two most widely used coupling agents. The experiment shows that these two coupling agents can improve the compatibility between filler and resin

(2) compatibilizer method

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adding compatibilizers is the simplest and most effective method. It is reported that suitable compatibilizers include maleic anhydride grafted plant fibers or maleic anhydride modified polyolefin resins, acrylate copolymers, ethylene acrylic copolymers. Most of these compatibilizers contain carboxyl or anhydride groups, which can esterificate with hydroxyl groups in wood flour, so as to reduce the polarity and hygroscopicity of wood flour and make it have good compatibility with resin

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