Polyvinyl chloride-based wood-polymer composition for profiled-trim moulding articles

FIELD: chemistry.

SUBSTANCE: polyvinyl chloride-based wood-polymer composition for profiled-trim moulding articles contains polyvinyl chloride, wood flour, a complex stabiliser, an acrylic modifier, polyethylene wax and a metal-containing lubricant. The metal-containing lubricant used in the composition is obtained by reacting higher monocarboxylic acids with glycerin at 130-230°C at molar ratio 1:(1-2) in the presence of oxides of divalent metals Ca, Zn, Mg or their two-component mixtures in weight ratio 0.25-1.0:0.5-1.0 in amount of 0.5-2.0 wt % of the overall reaction mass, where the higher monocarboxylic acids used are VIK, oleic and stearic acid. The composition also uses polyethylene wax with melting point not higher than 100°C. The complex stabiliser used is selected from: BAEROPAN R 9003 (produced by Baerlocher GmbH, Germany) or Naftosafe PEK 922 B (produced by Chemson, Austria). The acrylic modifier used is impact-resistant modifiers selected from: MB-87, DURASTRENGTH D320, DURASTRENGTH D300S (produced by Arkema, France), Metablen P-5500S (produced by Dangdong), Paraloid BTA 736H-S OS (produced by Rohm & Haac), Kane ACE F50 (produced by Kalek), Lariks on TU 2216-235-05757533-2000.

EFFECT: high quality of profiled-trim moulding articles, which is expressed by improved operational and technological parameters, specifically melt flow index, thermal stability, impact viscosity, low water absorption and environmental safety of the composition.

2 cl, 1 tbl

 

The invention relates to the chemistry of polymers, namely wood-polymer compositions based on polyvinyl chloride, which can be used for molding products.

A known method of manufacturing driveplate on the basis of two-component binder, which includes the determination of the characteristic parameter of the binder and the mixture of its components with the filler, where the characteristic parameter to determine the coefficient of linear thermal expansion of thermoplastic, and the mixture of binder components with filler start with a thermoplastic having a lower coefficient of linear expansion. As thermoplastics used low-density polyethylene 15803-020, high-density polyethylene 277, polyvinyl chloride PVC E - G, polystyrene SAR-325, secondary polyethylene [AC USSR N 1666306, CL B27N 3/02, 1991].

The disadvantage of this composition is a multi-stage and complexity of technology for driveplate, as well as low thermal stability of the compositions with PVC due to the lack of their composition stabilizers.

Known wood-polymer composition on the basis of emulsion polyvinyl chloride, including dioctylphthalate; epoxydecane soybean oil; pigment; the filler is wood flour treated with a mixture of white spirit and oligoastrocytoma; OLE the new acid. Wood-plastic composition intended for the manufacture of products by rotational molding [EN 1052519, publ. 1983.07.12, bull. No. 41].

Known wood-plastic composition, including the composition of the dispersed woody plant filler, a thermoplastic polymer binder, a polyelectrolyte, a crosslinking agent, organic peroxide, targeted supplements. As thermoplastic resin in the polymer composition used polyvinyl chloride. For processing the famous wood-plastic composition in the product use and extrusion method. A disadvantage of known composition is a low impact strength, relatively high water absorption, low tensile strength in bending [EN 2132347, publ. 1999.06.27].

Known wood-plastic composition based on polyvinyl chloride, including dioctylphthalate, barium stearate and zinc, wood filler and additive in the form of chopped straw. A disadvantage of the known polymeric composition is low operational and technological characteristics [EN 22048491, publ. 1995.11.20].

Closest to the claimed invention is a polymer composition comprising a thermoplastic polymer, an organic filler and additives target. As thermoplastic polymer contains a polymer selected is from the group includes vinyl-based polymers of vinyl chloride and its copolymers with vinyl acetate ethylene, propylene, copolymers based on methyl methacrylate or mixtures thereof. As the organic filler is cellulose waste wood, agricultural and textile production, with fractional composition of 0.1 to 8 mm, the ratio of the components in a known polymeric composition, wt.%:

the specified polymer 31,5-45,0

specified organic filler 50-65

additives target of 0.3-5

As the target additives used stearinovokisly calcium, stearinovokisly barium, stearin and paraffin technical [RF Patent №2005752, CL C08L 97/06, 1994].

The disadvantages of this composition is a low impact strength, thermal stability, fluidity of the melt, high water absorption, in addition, the composition does not provide ecological safety of polymer products due to the toxic stabilizer-stearinovokisly barium.

The objective of the invention is the improvement of impact strength, thermal stability, melt flow, reduced water absorption, as well as ensuring environmental safety of the composition for molding products.

The technical result in the use of the invention is expressed in improving the quality molding products.

In sukatani technical result is achieved by the feature of wood-polymer composition for molding products based on polyvinyl chloride, wood flour and including a stabilizer consisting in that the polymer composition comprising a non-toxic complex of calcium-zinc stabilizer further comprises an acrylic modifier, metal-containing lubricant and a polyethylene wax in the following ratio of components, parts by weight:

Polyvinyl chloride30-60
Wood flour70 pass within 40
Integrated stabilizer4-8
Acrylic modifier2-10
Polyethylene wax0,1-0,5
Metal-containing lubricant0,1-1,0

In the polymer composition is used:

- PVC suspension brand-5868 mud, M according to GOST 14332-U, PVC-G on THE 2212-241-00203312-2004, PVC-G on THE 2212-235-00203312-2003, PVC-R, PVC-U on THE 2212-186-02203312-98;

wood flour according to GOST 16361 or any other wood flour, meet the qualitative characteristics of the claimed composition;

- acrylic impact modifier strength grades: MV-87, DURASTRENGTH D320, DURASTRENGTH D300S, produced by Arkema, France, Metablen P-5500S, proizvodstvoother Dangdong, Paraloid BTA 736H-S OS, produced by Rohm &Naas, Kane ACE F50, produced by Kaneka, Lakes 95 on THE 2216-235-05757533-2000 or any other acrylic modifier, designed for processing unplasticized PVC;

- polyethylene wax with a melting point not higher than 100°C;

- metal-containing lubricant obtained by the interaction of higher monocarboxylic acids with glycerol at 130-230°C at a molar ratio of 1: (1-2) in the presence of oxides of divalent metals Ca, Zn, Mg or a two-component mixtures in a weight ratio of 0.25 to 1:0.5 to 1 in the amount of 0.5-2.0 wt.% of the total reaction mass, where as higher monocarboxylic acids use: VIC, oleic, stearic acid [RF Patent №2348664, CL C08L 27/06, 2009; Patent RF №2260020, CL C08L 27/06, 2005].

As a non-toxic stabilizer composition comprises a non-toxic complex calcium-zinc stabilizers brands: BAEROPAN R 9003 (producer-"Baerlocher GmbH, Germany), Naftosafe RNH 922 (producer - "Kimson", Austria), designed for the extrusion of technical profiles of wood-polymer compositions.

The invention is illustrated by the following examples.

Example 1.

Wood-polymer composition for molding products obtained as follows.

Polyvinyl chloride is mixed with an integrated stabilizer, polyethylene wax, acrylic is the first modifier, metal-containing grease in a hot mixer with a gradual heating up to 120°C, then the composition is discharged into cool mixer and mixed with wood flour. Cooled to 40-60°C composition is fed into a hopper, from which it is continuously loaded into the extruder as its processing into pellets. Pellets used for molding products.

Samples for testing are prepared by the method of rolling.

The melt flow index (MFR) determined according to GOST 11645-73. thermal stability of the sample is determined according to GOST 14041-91 at a temperature of 180°C. Water absorption and hardness is determined according to GOST 19111-77, impact strength Charpy according to GOST 4647-80.

In table 1 examples of wood-polymer compositions, indicating component and the quantitative composition and test results of the samples on technological parameters. Examples 1-14 - invention No. 15 on the prototype.

In the use of wood-polymer compositions of the claimed components in the respective amounts improve operational and technological parameters, namely, the melt flow index, thermal stability, impact strength, reduced water absorption. Use in the composition of wood-polymer compositions are non-toxic stabilizers ensures ecological safety of the finished product is s, expands the boundaries of the spheres of their use and increases the competitiveness of products.

ComponentsExamples according to the invention, the composition, parts by weight
123456789101112131415
Polyvinyl chloride PVC-PG3040506050505050-------
Polyvinyl chloride PVC-M--- -----30405060505045
Wood flour706050405050505070605040505050
Baeropan R9003 R/75,546,88----468-
Naftosafe RNH 922 ----45,56,58---45,58-
Polyethylene wax0,10,50,20,30,30,40,150,10,30,150,10,50,20,1-
Metal-containing lubricant0,10,510,110,50,10,50,10,250,1105 0,5-
Lakes 95257-
DURASTRENGTH D32025710-----------
Metablen P-550--------26 10----
Paraloid BTA 736H-S10852-------
The dioctylphthalate--------------4,5
Stearate Ca-------- ------0,5
Properties
thermal stability at 180°C, min.78678699617377856374885964765
MFR, g/10 min6,47,65,37,38,47,96,25,58,96,36,88,07,56,20,8
Water absorption for 24 h, %1,52,1 1,30,82,42,21,91,12,51,60,92,61,81,26,2
Hardness (kgf/cm2465244355143394350443849554242
Impact strength, kJ/m213,714,315,215,816,214,914,213,114,515,716,914,313,2/td> 13,74,5

1. Wood-plastic composition based on polyvinyl chloride for molding products, including wood flour, stabilizer and the target additive is a lubricant, characterized in that the composition contains a comprehensive non-toxic calcium-zinc stabilizer, acrylic modifier, polyethylene wax, and as the lubricant contains a metal-containing lubricant obtained by the interaction of higher monocarboxylic acids with glycerol at 130-230°C at a molar ratio of 1:(1-2) in the presence of oxides of divalent metals (CA, Zn, Mg or a two-component mixtures in a weight ratio of 0.25 to 1.0:0.5 to 1.0 and in the following ratio of components, parts by weight:

Polyvinyl chloride30-60
Wood flour40-70
Integrated stabilizer4-8
Acrylic modifier2-10
Polyethylene wax0,1-0,5
Metal-containing lubricant0,1-1,0

2. Wood-polymer composition according to claim 1, distinguishing the I, what song is used a polyethylene wax with a melting point not higher than 100°C.



 

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