PVC (Polyvinyl Chloride) wood plastic foaming material and preparation method thereof

Abstract

The invention discloses a PVC (Polyvinyl Chloride) wood plastic foaming material. The PVC wood plastic foaming material is prepared from the following raw materials in parts by weight: 20 to 70 parts of SG5 type PVC resin, 30 to 80 parts of SG7 type PVC resin, 10 to 60 parts of natural plant fiber, 30 to 80 parts of nano calcium carbonate, 5 to 30 parts of activated heavy calcium carbonate, 8 to 40 parts of modifier, 0.3 to 3 parts of polyethylene glycol, 0.5 to 3 parts of G60 type lubricant, 0.3 to 2 parts of maleic acid grafted PE (Poly Ethylene) wax compatibilizer, 2 to 6 parts of organic tin stabilizer, 5 to 10 parts of foam regulator, 1 to 8 parts of processing agent and 1 to 3 parts of composite foaming agent. All components in a formula of the PVC wood plastic foaming material provided by the invention are good in compatibility and have excellent dispersity and fluidity, so that the PVC wood plastic foaming material has good processing performance; meanwhile, the PVC wood plastic foaming material also is excellent in impact resistance, tensile strength, crack resistance, heat resistance and toughness, and has a wide market prospect.

Description

technical field [0001] The invention relates to the technical field of wood-plastic composite materials, in particular to a PVC wood-plastic foam material and a preparation method thereof. Background technique [0002] Wood-plastic composite material is a new type of environmentally friendly composite material that uses wood powder, bamboo powder, fruit shell powder or crop straw powder and plastic resin or waste plastic as the main raw materials, and is mixed and formed at high temperature. Compared with log materials, wood-plastic composite materials have better aging resistance, water absorption resistance and warping resistance. At the same time, they can prevent moths and corrosion, and do not require anti-corrosion treatment to reduce environmental pollution, and the cost is 40-40% lower than pure wood or plastic. 60%, can be processed into various hollow profiles, so wood-plastic composites are widely used in many fields, and it is a new type of material with the most...

AI Technical Summary

Problems solved by technology

However, due to the need to add a variety of additives during the processing of PVC resin, it is difficult to foam. After adding plant fiber components, the viscosity of the resin melt and the stiffness of the product are increased, which further increases the foaming difficulty of PVC plant fiber composite materials.

At the same time, there are a large number of polar C-Cl bonds in the molecular chain structure of PVC resin in PVC wood-plastic composite boards, and there is a large force between molecules. Therefore, compared with other general-purpose resins, PVC is a hard and brittle material with relatively low impact strength. Low, and has notch sensitivity, it is easy to be brittle when subjected to external impact, and it is difficult to be used as a structural material

These shortcomings greatly limit the development of PVC in the field of high performance. In order to expand its application range, it is necessary to toughen PVC

Commonly used elastomer tougheners can improve the impact resistance, but at the same time will significantly reduce the rigidity of the material itself.

In addition, since the wood powder or plant fiber in the wood-plastic composite material is strongly polar hydrophilic, but the polymer is non-polar hydrophobic, the polarity between the two is incompatible and there is a high interfacial energy difference.

Images