High temperature-resistant plastic composite material

Abstract

The invention discloses a high temperature-resistant plastic composite material made of modified lignocellulose and a polymer, and specifically the modified lignocellulose has characteristics of being hydrophobic and high temperature-resistant, wherein the polymer belongs to thermoplastic polymer. The modified lignocellulose can improve a processing temperature (as high as 300 DEG C) of the composite material, and can be applicable to various polymers; and meanwhile, the high temperature-resistant plastic composite material prepared by the modified lignocellulose and the thermoplastic polymer can overcome a defect that the conventional composite material is expanded by absorbing moisture in a using process, and can restrain corrosion of microorganisms.

Description

technical field

[0001] The invention relates to the field of manufacturing plastic composite materials. More specifically, it is composed of modified lignocellulose and polymer, wherein the modified lignocellulose has the characteristics of hydrophobicity and high temperature resistance. Background technique

[0002] Wood-plastic composite (WPC) is a modified thermoplastic material filled and reinforced with wood fiber or plant fiber. It is a new type of composite material that has been booming in recent years at home and abroad. Wood-plastic composite materials usually use polyethylene, polypropylene and polyvinyl chloride to replace the usual resin adhesives, and mix more than 50% of waste plant fibers such as wood powder, rice husk, straw, etc. into new wood materials, and then extruded Plates or profiles produced by plastic processing techniques such as pressing, molding, and injection molding.

[0003] Thermoplastic composites prepared with lignocellulose as filler ar...

Examples

Embodiment 1

[0015] The present invention will be further described in detail below in conjunction with the embodiments, so that those skilled in the art can implement it with reference to the description.

[0016] Example 1

[0017] 50 parts of lignocellulose modified by wet heat method, 50 parts of homopolypropylene (PPH) and 2 parts of coupling agent are blended. Take 250g of the mixture and inject it into a cavity of 200×200×6mm, press molding at 210°C for 5 minutes, and the density of the part is 1.05g / cm 3 , the bending strength is 42.7MPa, the bending modulus is 3150MPa, and the notched impact strength is 2.4KJ / m 2 , When immersed in boiling water for 5 hours, the water absorption rate is 2.9%, and the volume expansion is 2.2%.

Embodiment 2

[0019] 70 parts of modified lignocellulose and 30 parts of homopolypropylene (PPH) were blended. The compound was injection molded into test specimens (dog bone shape) under the injection molding machine at 210°C, and its mechanical properties were tested. The bending strength is about 51MPa, the bending modulus is 2230MPa, and the notched impact strength is 1.9KJ / m 2 .

Embodiment 3

[0021] 30 parts of modified lignocellulose, 35 parts of recycled high-density polyethylene (rHDPE) and 35 parts of polystyrene (PS) were blended. The compound was injection molded into test bars as in Example 2 and tested for mechanical properties. The bending strength is about 30MPa, the bending modulus is 2230MPa, and the notched impact strength is 11.4KJ / m 2 .

technical field

[0001] The invention relates to the field of manufacturing plastic composite materials. More specifically, it is composed of modified lignocellulose and polymer, wherein the modified lignocellulose has the characteristics of hydrophobicity and high temperature resistance. Background technique

[0002] Wood-plastic composite (WPC) is a modified thermoplastic material filled and reinforced with wood fiber or plant fiber. It is a new type of composite material that has been booming in recent years at home and abroad. Wood-plastic composite materials usually use polyethylene, polypropylene and polyvinyl chloride to replace the usual resin adhesives, and mix more than 50% of waste plant fibers such as wood powder, rice husk, straw, etc. into new wood materials, and then extruded Plates or profiles produced by plastic processing techniques such as pressing, molding, and injection molding.

[0003] Thermoplastic composites prepared with lignocellulose as filler ar...

Examples

Embodiment 1

[0015] The present invention will be further described in detail below in conjunction with the embodiments, so that those skilled in the art can implement it with reference to the description.

[0016] Example 1

[0017] 50 parts of lignocellulose modified by wet heat method, 50 parts of homopolypropylene (PPH) and 2 parts of coupling agent are blended. Take 250g of the mixture and inject it into a cavity of 200×200×6mm, press molding at 210°C for 5 minutes, and the density of the part is 1.05g / cm 3 , the bending strength is 42.7MPa, the bending modulus is 3150MPa, and the notched impact strength is 2.4KJ / m 2 , When immersed in boiling water for 5 hours, the water absorption rate is 2.9%, and the volume expansion is 2.2%.

Embodiment 2

[0019] 70 parts of modified lignocellulose and 30 parts of homopolypropylene (PPH) were blended. The compound was injection molded into test specimens (dog bone shape) under the injection molding machine at 210°C, and its mechanical properties were tested. The bending strength is about 51MPa, the bending modulus is 2230MPa, and the notched impact strength is 1.9KJ / m 2 .

Embodiment 3

[0021] 30 parts of modified lignocellulose, 35 parts of recycled high-density polyethylene (rHDPE) and 35 parts of polystyrene (PS) were blended. The compound was injection molded into test bars as in Example 2 and tested for mechanical properties. The bending strength is about 30MPa, the bending modulus is 2230MPa, and the notched impact strength is 11.4KJ / m 2 .