WO2013013473A1 - Cotton straw enhanced plastic wood product and preparation method thereof - Google Patents

Abstract

The present invention provides a cotton straw enhanced plastic wood product, which comprises the following components: 30 to 50 parts of short fiber wood material, 10 to 30 parts of cotton straw long fiber, 25 to 45 parts of waste recycled plastic, 1 to 4 parts of lubricant, 0.2 to 1 part of stabilizer, 1 to 2 parts of coupling agent, and 1 to 5 parts of other additives, the other additives comprising one or more of an ultraviolet absorber, an antioxidant, a fire retardant, a colorant, and a compatilizer. A preparation method of the cotton straw enhanced plastic wood product comprises the steps of short fiber wood material treatment, cotton straw long fiber preparation and treatment, material mixing, granulation, and extrusion molding. The method enhances the mechanical properties of the plastic wood product through properly preparing the cotton straw long fiber and adding the cotton straw long fiber into the plastic wood product. The product of the present invention is green and environmental friendly, has no limitation of the shape, and has wide application and low cost.

Description

 Cotton rod reinforced plastic wood product and preparation method thereof The present application claims to be submitted to the Chinese Patent Office on July 28, 2011, application number 201110213524.5, the invention name is "a cotton rod reinforced plastic wood product and its preparation method" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the processing of plastic wood products, and more particularly to a cotton rod reinforced plastic wood product and a method of preparing the same. Background technique

 Plastic wood products are emerging green products developed in recent years, mainly composed of waste recycled plastics and wood fibers and related additives.

The Chinese patent application publication No. CN1912299A discloses a plastic wood board prepared from crop fiber and waste recycled plastic, and the preparation method thereof comprises the following steps: mixing and drying the raw materials to produce a particle size of 2 to 6 mm. Plastic wood granules, put the plastic granules into the paving machine, and carry out the paving in the set mold frame. The 1-3 layers of glass fiber are added during the paving process to reinforce the material, heat-press and cure, and cool and shape. It can be seen that this method is only suitable for the production of solid wood-plastic panels, and the shape is limited by the size of the mold frame, and it is impossible to produce various specifications or hollow plastic wood products. On the other hand, in order to solve the problem of difficulty in dispersing lignocellulosic wood, many pairs of wood fibers are prepared by intensive shear dispersion in the preparation of existing wood-plastic products, but this method will result in a shorter length of wood fibers (using conventional screw plasticizing conveying). The length of the fiber in the product obtained by the method is often less than 1 mm), so the two continuous molding methods of extrusion and injection basically use the lignocellulosic powder as a raw material, and the powdery lignocellulosin only serves as a compatibilizing effect, thereby obtaining The wood-plastic products have poor mechanical properties. At present, a common solution is to add glass fiber to reinforce after granulation, but there are glass fiber and wood fiber in this method. Compatibility issues between plastics and issues such as increased density, increased cost, and equipment wear. Summary of the invention

 In order to solve the above problems, the present invention aims to provide a cotton rod reinforced plastic wood product and a preparation method thereof, which enhance the mechanical properties of a wood-plastic product by reasonably preparing a cotton rod long fiber and adding it to a plastic wood product. The product of the invention has the advantages of green environmental protection, unlimited shape, wide application and low cost.

 In one aspect, the invention provides a cotton rod reinforced wood-plastic product, which is composed of the following components by weight: 30~50 parts of short fiber wood material, 10~30 parts of cotton rod long fiber, 25~45 parts of waste recycled plastic 1 to 4 parts of lubricant, 0.2 to 1 part of stabilizer, 1 to 2 parts of coupling agent and 1 to 5 parts of other additives, other additives are ultraviolet absorbers, antioxidants, flame retardants, colorants and phases One or several of the contents.

 Preferably, the short fiber wood material mainly comprises sawdust, flower-making, peanut shell, short wood branch, bamboo branch, rice husk, coconut shell, flax, wheat straw, soybean hull, bagasse, corn cob, leaves and the like. Because the components of cotton stems include cellulose, hemicellulose, lignin and lipid bonds, etc., the lignin and fat bonds are not directly compatible with plastics, which is not conducive to the preparation of plastic wood products. The cotton rod long fiber used in the present invention refers to a long fiber in which a cotton rod is processed to remove a fat bond and lignin. The addition of long lengths of cotton rods with a certain aspect ratio helps to enhance the mechanical properties of the wood-based products. Preferably, the length of the cotton rod long fibers is 2 to 10 cm. More preferably, the length of the cotton rod long fibers is 4 to 8 cm. Compared with the use of glass fiber as a reinforcing material, cotton rod long fiber is rich in source, green and low cost, and there is no compatibility problem with wood fiber and plastic.

 Preferably, the waste recycled plastic is one or more of polyvinyl chloride, polypropylene, high density polyethylene, low density polyethylene, and linear low density polyethylene.

Preferably, the lubricant is one or more of paraffin, stearic acid and stearate. Preferably, the stabilizer is a rare earth stabilizer.

 Preferably, the coupling agent is one or more of a silane coupling agent, a titanate coupling agent, and an aluminum zirconate coupling agent.

 Preferably, the flame retardant is a bromine-based flame retardant, antimony trioxide or aluminum hydrate.

 And preferably, the cotton rod reinforced plastic wood product of the present invention is composed of the following components by weight: 35 to 45 parts of short fiber wood material, 15 to 25 parts of cotton rod long fiber, 30 to 40 parts of waste recycled plastic, lubricant 2~3 parts, 0.5~0.8 parts of stabilizer, 1~2 parts of coupling agent and 2~4 parts of other additives, other additives are UV absorber, anti-aging agent, flame retardant, coloring agent and compatibilizer One or several.

 More preferably, the cotton rod reinforced plastic wood product of the present invention is composed of the following components by weight: 40 parts of short fiber wood material, 20 parts of cotton rod long fiber, 35 parts of waste recycled plastic, 2 parts of lubricant, stabilizer 0.6 Parts, coupling agent 0.5 parts and other auxiliary agents 3 parts, other auxiliary agents are one or more of ultraviolet absorbers, antioxidants, flame retardants, colorants and compatibilizers.

 The cotton rod reinforced wood-plastic product of the invention can be of various specifications: regular shape structure or profiled structure, solid or hollow wood-plastic product, and thus can be widely applied to most occasions.

 In another aspect, the present invention provides a method of preparing a cotton rod reinforced plastic wood product, comprising the steps of:

 (1) treating short-fiber wood materials: mixing short-fiber wood materials and coupling agents, stirring, to obtain modified short-fiber wood materials;

(2) Preparing and processing cotton rod long fibers: taking cotton rods, washing, moisturizing, crushing, processing into coarse fibers by rolling, and then freezing the crude fibers at a temperature of -7~0 °C for 10 to 24 hours, then Thawed and processed into fine fiber by rolling, washing, filtering impurities, making long fiber of cotton rod, impregnating long cotton fiber with coupling agent, and then drying the long fiber of cotton rod at 30~40 °C , obtaining modified cotton rod long fibers; (3) Mixing, granulating and extrusion: mixing modified short fiber wood material, modified cotton long fiber, waste recycled plastic, lubricant, stabilizer and other auxiliaries, other additives are UV absorbers , one or more of an antioxidant, a flame retardant, a coloring agent and a compatibilizer, uniformly stirred to prepare a material mixture, and then the material mixture is added to a parallel twin screw to be granulated to obtain primary pellets, The primary pellets are extruded into a twin screw to produce a cotton rod reinforced plastic wood product.

 Wherein, the short fiber wood material in step (1) mainly comprises sawdust, shavings, peanut shells, short wood branches, bamboo branches, rice husks, coconut shells, flax, wheat straw, soybean hulls, bagasse, corn cob flowers, leaves, etc., plants The stalk can also be used as a short fiber wood material after being sheared. The short-fiber wood material is modified short-fiber wood material after surface modification by a coupling agent. Preferably, the short fiber wood material is 30 to 50 parts by weight, and the coupling agent is 1 to 2 parts.

 Step (2) is by processing the natural cotton rod. The coarse fibers obtained by rolling are in the form of sheets or strips. The frozen cotton fiber has a large volume of water due to condensation into ice. Thawing and rolling process can destroy the coarse fiber structure and facilitate the disintegration into fine fibers. This method can remove the lipid bonds and wood from the natural cotton rod. Simple and efficient. Preferably, the coarse fibers are soaked prior to freezing. The coupling agent for impregnating the long fibers of the cotton rod may be the coupling agent used in the step (1), preferably, diluted with a solvent of 5 times. The solvent evaporated when drying the long fibers of the cotton rod can be recycled by cooling.

Step (3) is mixing, granulating and extrusion molding. In the present invention, the mechanical properties of the wood-plastic product are improved by adding a long length of cotton rod with a certain aspect ratio. Preferably, the length of the cotton rod long fibers is 2 to 10 cm. More preferably, the length of the cotton rod long fibers is 4 to 8 cm. Preferably, the modified short fiber wood material is 30 to 50 parts by weight, the modified cotton rod long fiber is 10 to 30 parts, the waste recycled plastic is 25 to 45 parts, the lubricant is 2 to 3 parts, and the stabilizer is 0.2 to 1 part and other auxiliary agents are 1 to 5 parts. More preferably, the modified short fiber wood material is 35 to 45 parts by weight, the modified cotton rod long fiber is 15 to 25 parts, the waste recycled plastic is 30 to 40 parts, the lubricant is 2 to 3 parts, and the stabilizer is used. 0.5~0.8 parts and other additives are 2~4 Share. And preferably, the modified short fiber wood material is 40 parts by weight, the modified cotton rod long fiber is 20 parts, the waste recycled plastic is 35 parts, the lubricant is 2 parts, the stabilizer is 0.6 parts, and other auxiliary agents are 3 copies.

 The invention provides a cotton rod reinforced plastic wood product and a preparation method thereof, which have the following beneficial effects: The method enhances the mechanical properties of the plastic wood product by reasonably preparing the cotton rod long fiber and adding to the plastic wood product. The product of the invention has the advantages of green environmental protection, unlimited shape, wide application and low cost. It is also capable of producing plastic wood products of various specifications, solid or hollow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and refinements without departing from the principles of the present invention. Retouching is also considered to be the scope of protection of the present invention.

 Embodiment 1

 A method for preparing a cotton rod reinforced plastic wood product, comprising the following steps:

 (1) treating short-fiber wood material: mixing and stirring 40 parts of short-fiber wood material and 1 part of coupling agent to obtain modified short-fiber wood material;

 (2) Prepare and process long cotton fiber: Take cotton rod, wash, moisturize, crush, process into coarse fiber by rolling, then freeze the crude fiber for 15 hours at -5 °C, then thaw and roll Pressing into fine fiber, cleaning, filtering impurities, making long fiber of cotton rod, impregnating cotton rod long fiber with coupling agent, and then drying cotton long fiber at 35 °C to obtain modified cotton Long fiber

(3) Mixing, granulating and extrusion: 40 parts of modified short fiber wood material, 20 parts of modified cotton rod long fiber, 35 parts of waste recycled plastic, 2 parts of lubricant, The stabilizer is 0.6 parts, 1 part of the ultraviolet absorber, 1 part of the antioxidant, and 1 part of the flame retardant are mixed, uniformly stirred to prepare a material mixture, and then the material mixture is added to the parallel twin screw to be granulated, and the primary pellet is obtained. , will begin The grade pellets are put into twin-screw and extruded to produce cotton rods to enhance plastic wood production.

Claims

Rights request 1. A cotton rod reinforced plastic wood product, characterized in that it consists of the following components by weight: 30 to 50 parts of short fiber wood material, 10 to 30 parts of cotton rod long fiber, 25 to 45 parts of waste recycled plastic, 1 to 4 parts of lubricant, 0.2 to 1 part of stabilizer, 1 to 2 parts of coupling agent and 1 to 5 parts of other additives, other additives are UV absorbers, antioxidants, flame retardants, colorants and compatible One or several of the agents.  2. The cotton reinforced wood product according to claim 1, wherein the short fiber wood material is selected from the group consisting of sawdust, shavings, peanut shells, short wood branches, bamboo branches, rice husks, coconut shells, flax, wheat One or several of stalks of orange, soybean hulls, bagasse, cob flowers, leaves and plants.  3. The cotton rod reinforced wood-plastic product according to claim 1, wherein the cotton rod long fiber is a long fiber obtained by processing a cotton rod to remove a fat bond and lignin.  The cotton reinforced plastic wood product according to claim 1, wherein the length of the cotton bat long fibers is 2 to 10 cm.  The cotton rod reinforced wood-plastic product according to claim 1, which is composed of the following components in parts by weight: 35 to 45 parts of short fiber wood material, 15 to 25 parts of cotton rod long fiber, waste recycled plastic 30~40 parts, 2~3 parts of lubricant, 0.5~0.8 parts of stabilizer, 1~2 parts of coupling agent and 2~4 parts of other additives, other additives are UV absorber, anti-aging agent, flame retardant, One or more of a colorant and a compatibilizer.  6. The cotton reinforced plastic wood product according to claim 1, wherein the cotton reinforced plastic wood product is a regular shape structure or a profiled structure.  7. The cotton reinforced plastic wood product according to claim 1, wherein the cotton reinforced plastic wood product is a solid or hollow product. 8. A method for preparing a cotton rod reinforced plastic wood product, comprising the steps of: (1) treating short-fiber wood materials: mixing short-fiber wood materials and coupling agents, stirring, to obtain modified short-fiber wood materials;  (2) Preparing and processing cotton rod long fibers: taking cotton rods, washing, moisturizing, crushing, processing into coarse fibers by rolling, and then freezing the crude fibers at a temperature of -7~0 °C for 10 to 24 hours, then Thawed and processed into fine fiber by rolling, washing, filtering impurities, making long fiber of cotton rod, impregnating long cotton fiber with coupling agent, and then drying the long fiber of cotton rod at 30~40 °C , obtaining modified cotton rod long fibers;  (3) Mixing, granulating and extrusion: mixing modified short fiber wood material, modified cotton long fiber, waste recycled plastic, lubricant, stabilizer and other auxiliaries, other additives are UV absorbers , one or more of an antioxidant, a flame retardant, a coloring agent and a compatibilizer, uniformly stirred to prepare a material mixture, and then the material mixture is added to a parallel twin screw to be granulated to obtain primary pellets, The primary pellets are extruded into a twin screw to produce a cotton rod reinforced plastic wood product.  The preparation method according to claim 8, wherein in the step (1), the short fiber wood material is 30 to 50 parts by weight, and the coupling agent is 1 to 2 parts.  The preparation method according to claim 8, wherein in the step (3), the modified short fiber wood material is 30 to 50 parts by weight, and the modified cotton rod long fiber is 10 to 30. The waste recycled plastic is 25 to 45 parts, the lubricant is 1 to 4 parts, the stabilizer is 0.2 to 1 part, and the other auxiliary agent is 1 to 5 parts.