Preparation method of long-chain unsaturated silane coupling agent, and wood-plastic composite material production technology

Abstract

The invention discloses a preparation method of a long-chain unsaturated silane coupling agent, and a wood plastic material production technology. The preparation method comprises the following steps that long-chain unsaturated fatty acid and an alkali solution of which the mole amount is the same as the mole amount of the long-chain unsaturated fatty acid undergo a reaction to produce an unsaturated fatty acid salt; and the unsaturated fatty acid salt and chlorosilane of which the mole amount is the same as the mole amount of the unsaturated fatty acid salt undergo a reaction in the presence of tetrabutylammonium chloride to produce the long-chain unsaturated silane coupling agent. 100 parts of thermoplastic plastic, 50 to 150 parts of plant fiber powder, 1 to 15 parts of long-chain unsaturated silane, 1.5 to 5 parts of a lubricant and 0.5 to 1.5 parts of an initiator are subjected to in-situ reaction extrusion in an extruder to produce a wood-plastic composite material. The adopted long-chain unsaturated silane has moderate activity and can fully contact with the plant fiber powder and resin molecules so that the long-chain unsaturated silane and the plant fiber powder and the resin molecules undergo a chemical reaction; and through chemical bonding effects stronger than a dispersion force, high interface bonding strength is obtained and a doping amount and performances of plant fiber powder are greatly improved.

Description

Technical field [0001] The present invention involves the preparation method of a silicane coupling agent and the production process of wood plastic composite materials. It specially involves the preparation method of a long -chain unsaturated silicane coupling agent and the use of the coupling agent to squeeze out through the original response.Prepare the production process of high -intensity wooden plastic composite materials. Background technique [0002] Wood plastic materials are prepared with plant fiber powder (wood powder or crop fiber powder) and thermoplastic plastic.Because the main components of plant fibers are cellulose and semic cellulose, there are a large amount of hydroxyl group in the molecules, which are relatively strong, and it is not easy to disperse during processing.It is very poor, which greatly weakens the mechanical properties of wood plastic materials.Therefore, measures must be taken during the process of preparing wooden plastic materials to improve...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that this type of coupling agent, such as vinyltriethoxysilane, has a relatively short chain at the alkyl end (the number of carbon atoms at the alkyl end is 2 or 3), and the treated wood flour and plastic molecules The interface between only short alkyl groups and plastic molecules produces dispersion force, the interface bonding strength is small, and the strength of wood-plastic materials is not high enough

Compatibilizers are generally prepared by reacting polymers with polar monomers; due to the low grafting rate, generally below 5%, the main component of the compatibilizer is a non-polar macromolecule, which has poor mobility and is not easy to bond with the surface of wood flour. Esterification reaction occurs through contact; at the same time, the connection between the compatibilizer and the plastic is still only through the dispersion force, and the interface bonding strength is still not high; due to these two reasons, the use of compatibilizers to prepare plant fiber powder for wood-plastic materials Dosage is not high