Wood-filled plastic and method for production thereof

FIELD: chemistry.

SUBSTANCE: wood-polymer composition consists of, wt %: wood-vegetable filler 70-90, thermoplastic polymer binder 8-25, a sodium salt of polyethylene polyaminomethylene phosphonic acid 0.5-1.0 and target additives - the balance. The thermoplastic polymer binder is selected from a group of vinyl polymers based on vinyl chloride or copolymes thereof with vinyl acetate, polymers based on ethylene, propylene, copolymers thereof, polymers based on methyl methacrylate, polyethylene terephthalate, polystyrene or mixture thereof.

EFFECT: invention improves strength properties of the composition, simplifies the composition and method for production thereof.

2 cl, 2 tbl

 

The invention relates to the technology of wood-polymer compositions and can be used in the building materials industry, furniture industry, mechanical engineering and other industries.

Known composition to obtain a film material including polyvinyl chloride (100 parts), a copolymer of vinyl chloride with vinyl acetate (90-110 parts), plasticizer (48-56 parts), stabilizer (3-4 parts), wood flour (60-90 parts), the pigment (2-6 parts) (A.S. USSR 553264, IPC2C08L 27/06, publ. 05.04.1977, B. I. No. 13). The disadvantages of this composition are narrow circle used thermoplastic polymers and of the products obtained and the low strength characteristics of the films.

A method of obtaining molded products of wood-plastic materials, including drying of wood particles to a moisture content of 0.5-1.5%, consistent mixing with dioctylphthalate, with powdered polyvinyl chloride and zinc stearate, extruding the resulting mixture at a temperature in the zone of compression 90-160C and in the zone of extrusion 140-160C (A.S. USSR 1712150, IPC5UK 3/52, B27N 3/02, publ. 15.02.1992, B. I. No. 6). The disadvantages of this method are the narrow range of applied polymers and of the products obtained and the low strength characteristics of the products obtained.

A method of obtaining a polymer composition based on maleinovogo binder (polypropylene, polyethylene), comprising a mixture of polyethylene or polypropylene with wood filler and homogenization of the mixture at 160-210C, followed by the introduction of a mixture of 3-5 wt.% plasticizer and homogenization at 150-200C (A.S. USSR 1694598, IPC508J 3/205, publ. 30.11.11, BI No. 44). The disadvantage of this composition are the low strength properties and a multi-stage plastic recycling.

Known polymer composition comprising a thermoplastic polymer selected from the group of vinyl-based polymers of vinyl chloride or its copolymers with vinyl acetate, polymers based on ethylene, propylene, copolymers, polymers based on methyl methacrylate or mixtures thereof), an organic filler (wood waste, agricultural or textile production, with fractional composition of 0.1-8.0 mm), the target additives (plasticizer is dioctylphthalate, the stabilizer is calcium stearate, organic dye) (U.S. Pat. RF 2005752, IPC5C08L 97/02, publ. 15.01.1994). The disadvantage of this composition is a low strength characteristics and high water absorption.

Closest to the technical essence and the achieved technical result is a wood-polymer composition based on a thermoplastic polymer, wood and vegetable fillers and special additives and method of reception, including smallchange woody vegetation filler with the processing of the polyelectrolyte, drying with the processing of cross-linking agent and mixed with other dried components (U.S. Pat. RF 2132347, IPC6C08L 97/02, publ. 27.06.1999). A disadvantage of the known compositions is that it has a complex composition and the technology of production, and not enough high strength properties.

The technical result, which directed the present invention is to improve the strength properties of the composition and the simplification of the composition and method of receipt.

The technical result is achieved by the fact that wood-plastic composition consisting of wood and vegetable filler, a thermoplastic polymer binders and special additives, characterized by the fact that it further comprises a reagent PAF-13A and these components are selected in the following ratios, wt.%:

woody vegetation filler70-90
thermoplastic polymer binder8-25
reagent PAF-13A0,5-1,0
and additives targetthe rest,

and method for producing wood-filled plastics, including drying of components, mixing and termof romanie, characterized by the fact that woody vegetation filler before drying treated with an aqueous solution of the reagent PAF-13A, dried at 90-100C and mixed with other pre-dried components.

One of the goals of the introduction of woody vegetation filler in the composition of the polymer composite is a savings of more expensive polymeric binder, so the use of this filler content below 70 mass (and the content of thermoplastic above 25 mass) leads to a loss of economic efficiency of technical solutions. The content of the woody vegetation of the filler above 90 mass (and the content of thermoplastic below 8 mass) leads to rapidly increasing loss of strength properties of the polymer material. The use of reagent PAF-13A at the number below 0.5 mass does not allow to achieve a sufficient degree of alignment of the treated wood and vegetable filler with thermoplastic polymer. The upper limit of the content of PAF-13A 1.0 mass is determined by its adequacy to align the filler at its maximum content (90 mass).

Table 1 presents examples of modes of production and composition of the proposed wood-filled plastics. Table 2 shows the properties of the compositions according to the examples.

The introduction of large quantities of fillers can affect the strength characteristic is cteristic polymeric materials, and other properties. For the best combination of polar particles of wood filler with a non-polar matrix of thermoplastic polymers can be used chemical modifiers.

A characteristic feature of the claimed technical solution is the presence in the composition of the reagent PAF-13A, which represents the sodium salt polyethylenepolypropylene acid (TU 2439-360-05763441-2001), which is a polymer electrolyte, has an affinity for polar surfaces of particles of wood filler, and can firmly contact with them due to the interaction with the surface groups and fill the pores of the particles. Modification of particles of wood and vegetable filler reduces the polarity of their surface and improves compatibility with various thermoplastic polymers. Consequently, it is possible to obtain composites with high (up to 90 wt.%) wood-containing vegetable filler. Among thermoplastic polymers include polyethylene, polypropylene or their copolymers, polyvinyl chloride or its copolymers with vinyl acetate, polymethyl methacrylate, polyethylene terephthalate, polystyrene, or a mixture thereof. It should be noted that the list does not limit the possibilities of using other non-polar or monopolarly inherently thermoplastic polymers capable of when on the revani to soften up of fluid status and be mixed with fillers, including processed by the proposed method woody and fibrous filler.

The method of obtaining wood-filled plastics can be carried out as follows. Woody vegetation filler is treated with a solution of PAF-13A (sodium salt polyethylenepolypropylene acid) and dried at a temperature of 90-100C, then mixed with previously dried the rest and processed by extrusion or pressing.

According to the proposed technical solution as a wood filler can serve as wood flour of different grades (GOST 16361-87).

As the target additives used stearates of calcium, zinc and other known plasticizers and dyes.

As can be seen from tables 1 and 2, the compositions illustrated non-limiting examples 1-14, is compared with the prototype of the higher strength properties and simple structure, and technology of obtaining.

Reference to the application

1. Wood-plastic composition consisting of wood and vegetable filler, a thermoplastic polymer binder from the group of vinyl-based polymers of vinyl chloride or its copolymers with vinyl acetate, polymers based on ethylene, propylene, the copolymer is in, polymers based on methacrylate, polyethylene terephthalate, polystyrene, or mixtures thereof, and specific additives, characterized in that it further contains a reagent PAF-13A, which is the sodium salt polyethylenepolypropylene acid, and these components are selected in the following ratios, wt%:

woody vegetation filler70-90
thermoplastic polymer binder8-25
PAF-13A0,5-1,0
additives targetrest

2. The method of obtaining wood-filled plastics according to claim 1, comprising drying the components, mixing and thermoforming, characterized in that the wood-vegetable filler before drying treated with an aqueous solution of the reagent PAPA, followed by drying at 90-100C and mixed with other pre-dried components.



 

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