SU1694598A1 - Method of producing polymer composition - Google Patents

Abstract

The invention relates to methods for producing wood plastics and can be used for the manufacture of consumer products. The invention makes it possible to increase the strength and reduce the viscosity of the composition by preliminarily mixing polyethylene or polypropylene with wood filler, homogenizing the mixture at 160-210 ° C, and then adding it to the mixture on 3-5 May. % solid hydrocarbon and rehomogenization at 150-200 ° C. 1 tab.

Description

The invention relates to the production of wood-based plastics based on polyolefin binder (polypropylene, polyethylene) and can be used in various industries of the national economy for the manufacture of engineering and construction products.

The purpose of the invention is to increase the strength, decrease the viscosity of the melt composition, while reducing the amount of plasticizer.

PRI me R. Polyolefins are used as a binder: high-pressure polyethylene grade 15802-020 (GOST 16337-77), polypropylene grade A (TU 6-05- 1849-78) and low-pressure polyethylene grade 20108-001 (GOST 16338-77). The plasticizer is technical paraffin (TU 6-09-3637-74) and ceresin (GOST 2488-79). The filler is sawdust of hardwood of fraction 0.63 / 0.13 mm in compositions with paraffin and mixed breeds of fraction 1.5 / 1.0 mm in compositions with ceresin. Wood particles have a moisture content of 1-12%.

The method for producing wood plastic is carried out on the basis of a computerized plastomer from Brabender (Germany). To homogenize wood particles with polyolefins and their mixtures with a plasticizer, a special planetary-type stirrer with a capacity of 2500 cm is used, which is connected to a circulation thermostat to maintain a constant temperature. The speed of rotation of the blades is 18-20 rpm. The torque on the motor shaft is fixed by a plastic encoder.

Wood plastic is made as follows.

At 50–100 ° C, the wood particles are dried to a moisture content of 1–12%, after which they are mixed in a two-bladed mixer with a thermoplastic binder. The mixture is then homogenized at. 160-210 ° C for 10 min. After that, technical paraffin or ceresin is introduced into the melt in the amount of 3-5 wt.% And

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homogenization of the mixture is continued, the temperature of homogenization with paraffin is 150–200 ° C, homogenization is continued for 10 min, then the homogenized mixture is cooled in air to room temperature and granulated on a CO-1 knife grinder to a particle size of 1–5 mm. serves as a starting material for the manufacture of molded samples. The formulation of wood plastic corresponds to tabular data.

Samples for physical and mechanical properties tests are obtained on an injection molding machine of 125 cm3 injection under the following conditions: injection time of 20 s, injection pressure of 65 kg / cm2, holding and cooling for 300 s.

The mode of manufacture of standard samples to determine the physicomechanical characteristics, as well as the parameters for determining all indicators, are maintained equal in all cases.

The modes of manufacture of injection molding samples by zones: 1 - 90 ± 5 ° С; 2 - 170 ± 5 ° С; 3 - 200 ± 5 ° С; 4 - 200 ± 5 ° С.

Wood made in this way is tested for stretching (GOST 11262-80) and water absorption per day (GOST 4650-73).

The test results, as well as various options for the production modes and compositions of wood plastics are given in the table.

The technology of manufacturing wood plastics by a known method involves the initial mixing of 10 wt.% Plasticizer with wood particles, their homogenization at 120-140 ° C in a planetary-type mixer for 10 minutes, and then the introduction of the binder and homogenization for 10 minutes at 160-200 ° s Samples for physico-mechanical tests obtained by the method of injection molding in the same way as described,

The modes of manufacture of control samples for determining tensile strength, as well as the parameters for determining all indicators, are maintained equal to those of the known method.

Claims (1)

Claims A method for producing a polymer composition comprising blending polyethylene or polypropylene with wood filler and plasticizer - solid saturated hydrocarbon and homogenizing the mixture, characterized in that, in order to increase the strength, decrease the viscosity of the melt composition with a decrease in the amount of plasticizer, the filler is mixed with polyethylene or polypropylene and homogenize the mixture at 160-210 ° C, after which 3-5% by weight of plasticizer are introduced into the mixture and the homogenization is carried out again at 150 -200 ° C. 50 four 46 The composition of levoplastikov, wt.%: Polypropylene .- 50 Low density polyethylene nosti50 High density polyethylene Saturated hydrocarbons 10 10 Wood particles40 iG Manufacturing technology parameters Initial displacement of wood particles with paraffin + + polyolefin + The temperature of homogenization, C120 140 Secondary mixing of modified particles with paraffin (options 5-9, 11-13), ceresin (option} 0) - polyolefin + 4 The temperature of homogenization, With 160 Properties of woodworking Strength at stretching, NPA6.9 10.3 7.5 120 200 160 50 4 46 Zoo 50 3 47 five i, 46 50 5 45 50 five 45 50 four 46 ISO 130 200 ISO 180 50 4. 46 140 170 190 210 160 190 180 170 50 2 48 150 140 50 7 3 230 220 50 7 43 230 220 11.4 15.5 16.2 17.7 11.2 13.5 16.5 10.2 11.8 9.0 five 50 50 50 50 50 50 i, 46 5 45 five 45 50 four 46 4. 46 2 48 7 3 7 43 150 230 230 130 200 ISO 180 170 140 220 220 T.L Leea rWnfiTPrelagaemy way Indicators IM.STNY SPOUB PRMPvG-myv SPOSOO I -. - -yrr T iG -. 1 hr m 12 M5 j 1 | g ..-- 4 ----- - Water treatment. I. m day- Jo 2J (3 2jl, 2.52.82.5 Loc. P "™"., Silt ..,;,.; IK in. "Zo" 3 ". ,five . . " A twisting moment Gvigatel pererabaty.avchego5 - 536.5 875 Lambs Omni. n «« 891Z 5 Weight loss during processing .a e "t. m 0 -;) a Oj08 MG-0.02 0.1 M5 waxing paraffin, Table continuation