Method of producing rigid polyvinyl chloride-based wood-polymer composition

FIELD: chemistry.

SUBSTANCE: method involves preparation of a polymer composition based on PVC, an impact strength modifier, a heat stabiliser, a binding agent and addition of modified wood flour. The wood flour is obtained by pre-saturating wood flour with aqueous solutions of binding agents of silica sol or carbon nanotubes, stirring the obtained mixture and drying.

EFFECT: wood-polymer materials based on the obtained highly filled rigid polyvinyl chloride composition have high tensile strength and thermal stability, low viscosity, flammability and water absorption.

1 tbl

 

The invention relates to a process for the production of hard polyvinylchloride compositions using as the organic filler is wood flour for making highly filled wood-plastic materials.

A method of obtaining wood-polymer compositions based on thermoplastic binder (polypropylene, polyethylene of low and high densities, polyvinyl chloride and polystyrene) and wood particles (Patent SU # 1666306, CL 27N 3/02, 1991).

The disadvantages of the composition should include low values of physico-mechanical characteristics of the obtained materials by reducing the content of the polymeric binder.

A known method of preparation of wood-polymer composition on the basis of semi-rigid PVC and wood flour (up to 57 wt.%) (Patent RU №2081135, CL 08L 97/02, 1997). Wood-polymer composition was prepared as follows: pre-drying was carried out wood flour at a temperature of 50-80°C in thermostat type SNOL-1,5 or in special designed tabactivity-dryer to the desired residual moisture content of 0.1-5 wt.%. Next was tabactivity (high-speed mixing at a temperature of from 10 to 220°C and rotor speed from 2 to 1200 rpm) wood flour with inorganic modifier (calcite, wait, vermiculite or talc) on a non-standard you who okasareta tabactivity. After Trebechovice wood flour and other ingredients were loaded into a high-speed mixer and the resulting mixture in the subsequent extrusion was molded required for testing samples.

The disadvantages of this method include complex technology tabactivity wood flour and non-standard equipment, required to obtain the finished product.

The closest in technical essence is a method of manufacturing rigid PVC compositions based on pine wood flour (Yanjun Xu. Creep behavior of natural fiber reinforced polymer composites: a Dissertation for the degree of Doctor of philosophy in the School of Renewable Natural Recources / Yanjun Xu. - Louisia State, 2009. - P.9). The maximum degree of filling of the wood flour was equal to 30 wt.% or 40 mass 100 mass PVC. As a binder agent, a modifier was used SABS (stimulationlutheran), which was administered from 0 to 5 wt.%. The method of preparation of wood-polymer compositions based on PVC was as follows: weighted in accordance with the formulation components of the polymer mixture was mixed at a temperature of 196-202°C and 4800 rpm Then the resulting material was cooled and granulated, and then stirred at 180°C and 60 rpm for 10 minutes for a more uniform distribution of the binder agent in the polymeric matrix. Plate for testing was prepared by the camping pressing at 190°C.

The main disadvantage of the composition can be attributed to the complex and time-consuming technique of distribution of the binding agent in wood-plastic composition, a relatively low content of organic filler (not more than 30 wt.% filler) and the increase in Flammability with the introduction of organic binding agent.

The analysis techniques and the identification of sources containing information about the equivalents of the claimed invention, has allowed to establish that it is not detected analogues characterized by signs, identical with all the essential features of the claimed invention. Therefore, the claimed invention meets the condition of "novelty".

The task of the invention to provide a highly filled (the content of the organic filler is more than 50 wt.%) rigid PVC compositions based on wood flour with maintaining the technological and operational characteristics.

The result is achieved that the method of obtaining wood-polymer composition on the basis of rigid polyvinylchloride (PVC), including the preparation of polymer compositions based on PVC, impact strength modifier, thermo stabilizer, coupling agent and the introduction of modified wood flour, according to the invention differs in that the wood flour is pre-impregnated with aqueous solutions of the binder and the clients - crematoria or multiwall carbon nanotubes, thoroughly mixed and dried at 102±3°C to constant weight, and the concentration of Kremenets in the wood flour is 0.01-10%, the concentration of carbon nanotubes is 0.001 to 0.05%, and the degree of filling of wood-plastic composition is 26-60 wt.% modified wood flour.

For wood-polymer compositions based on PVC was used components that meet the following requirements.

Polyvinyl chloride suspension brand SM (GOST 14332-78).

Thermo stabilizer, for example PAPS 805, VICOSTAP, Interstab. In the example used Interstab (certificate No. 99-00244), is a complex on the basis of dibasic lead stearate (51% Pb), Tplvl=107°C.

The impact strength modifier, such as innovations for this 3 FK, ASM-2, Acrylic Impact Modifier, FM 22. In the example used FM-22 - arivalagan-styrene copolymer, is a homogeneous white powder with a bulk density 510 kg/m3and an average particle size of 220 μm.

Wood flour brand 180 (GOST 16361-87).

As a binder agent, a modifier used:

Crumpsall (Sol of silicon oxide) is a colourless or slightly coloured yellowish or grayish shade of a colloidal solution. The stability of the colloidal system is provided by the content in rest the re of sodium hydroxide, therefore, the solution has an alkaline reaction (pH of 10.3). The density of Kremenets equal to 1.2 g/cm3the concentration of silicon dioxide - 330 to 340 g/l, the concentration of sodium oxide and 3.4 g/l, viscosity is not more than 20 cSt, the diameter of the micelles is 5-9,5 nm.

Or carbon nanotubes (CNTS) representing cylinders, obtained by collapsing without seams flat hexagonal mesh graphite layer surface, tiled correct hexagons with the carbon atoms located at the vertices. In the work of the applied multilayer carbon nanotubes Graphistrength™ company Arcema dissolved in distilled water with 10-15 layers of tubes with an external diameter of 10-15 nm, length of 1-15 microns with an average density of 50-150 kg/m3, specific surface 119,33 m2/g, young's modulus ~0.8 GPA, Poisson's ratio ~0,33 and shear modulus of ~0.45 HPa.

Wood-polymer composition on the basis of the PVC material was prepared as follows: tramasol or carbon nanotubes were diluted with distilled water, the resulting diluted solution of a binding agent, a modifier moistened wood flour, which is then thoroughly mixed for 5 minutes mechanically. The obtained modified wood flour was dried at a temperature of 102±3°C to constant weight. The concentration of Kremenets in the wood flour is 0.01-10%, the concentration of CNT - 0,01-0,05%). The dried nano-modified wood flour in the amount of 26-60 wt.%) added to the PVC composition.

For studies of the properties of the resulting wood-polymer compositions were produced samples in the form of films. Film samples were prepared by the method of thermoplastically on a laboratory roll mill with Freccia 1:1.25 at a temperature of rolls 160-180°C for 5-6 min, depending on the content of the wood flour. Rolling was carried out with the thickness of the gap between rolls 8-13 microns.

Properties of compositions with different degree of filling are presented in table 1.

Table 1

Comparative characteristics of PVC-composici*full of original and modified kremnezem / CNTS wood flour
Filler (100 mass PVC)Index
Tensile strength, MPaThe melt flow index (MFR, g/10 minThermostable-
ness, min
Without wood flour (control)320,3172
Original wood flour:the
40 mass330, 2481
70 mass or 40 wt.% (max)260, 1685
Modified by kremnezem
(0,35%) wood flour:
40 mass or 26 wt.%380,3286
80 mass340,18100
120 mass300110
160 mass or 60 wt.% (max)270118
Modified CNTS (0,008%)
wood flour:
40 mass or 26 wt.%430,1496
80 mass350,05110
120 mass280116
160 mass or 60 wt.% (max)240127
Prototype:
30 wt.%+0% SEBS31no datano Dan-
30 wt.%+2.5% SEBS34data
30 wt.%+5% SEBS27
* PVC compositions were obtained in the following ratio of components, mass: PVC -100, the impact strength modifier FM-22 - 7, thermo stabilizer Interstab - 5.5, nano-modified wood flour (pine) - 0-160.

The degree of filling of the proposed rigid PVC compositions in comparison with the prototype managed to increase by 2 times (from 30 to 60 wt.% wood flour).

In the case of use as a binding agent-modifier CNTS significantly improve thermal stability and strength properties. The disadvantage of using this modifier can be considered a lower melt flow index (MFR).

For the samples filled with modified inorganic kremnezem wood flour, along with improved tensile strength and thermal stability can significantly reduce the viscosity and to reduce the Flammability and water absorption.

The method of obtaining wood-polymer composition on the basis of rigid polyvinylchloride (PVC), including the preparation of polymer compositions based on PVC, impact strength modifier, thermo stabilizer, coupling agent and the introduction of modified wood flour, characterized in that the use of wood flour, which is obtained preliminary impregnation of wood flour aqueous solutions of binder agents - Kremenets or carbon nanotubes, the mixture and drying at 102±3°C to constant weight,and the concentration of Kremenets in the wood flour is 0.01-10%, the concentration of carbon nanotubes 0,001-0,05%.



 

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