Biodegradable composition based on polyethylene and natural wood processing products
SUBSTANCE: invention relates to a biodegradable thermoplastic composition. The composition contains polyethylene, wood flour and functional additives, such as concrete stone, polyvinyl alcohol, a compatibilising agent and nanoparticles. The compatibilising agent is primarily an ethylene and vinyl acetate copolymer and the nanoparticles are chemically deposited iron hydroxide or calcium sulphate nanoparticles.
EFFECT: use of cheap and readily available wood mechanical processing wastes, with high concentration thereof, as biodegradable material in the disclosed composition allows for normal use of articles in ordinary conditions, as well as the given rate of biodegradation in disposal conditions after use; wherein polyethylene in the composition can be used in form of manufacturing and/or household wastes.
3 cl, 1 tbl
The invention relates to the production of polymer compositions containing as the basis polyethylene or propylene, as a filler, an organic material of plant origin, as well as various functional additives. Compositions intended for the production of biologically decomposable products for various purposes, such as films, termoformovannyh products, using traditional techniques and equipment.
Known biologically erodible thermoplastic composition made from industrial and domestic waste polyethylene as the polymer base, sugar beet pulp as a biodegradable filler and bentonite as a functional additive (application EN 2008138385, IPC C08L 30/00, C08J 3/02, publ. 10.04.2010,). The components in the composition are contained in the following ratio, wt.%: waste polyethylene - 89-60, beet pulp - 10-30, bentonite - 1-10. The bentonite in this composition is used as a dispersant, to facilitate the distribution of components in a polymer matrix.
The disadvantages of the method include the high viscosity of the molten composition in the operating mode of its processing, as well as high flow polymer.
Closest to the technical essence and the purpose of the composition to the composition in the present invention is a composition comprising as a base which you industrial and/or household waste polyethylene, as a biodegradable filler - rice husk, its main components are cellulose, hemicellulose and lignin, as well as the functional additive is titanium dioxide and the oligomeric dye (RU 2363711, IPC C08L 23/06, C08L 97/02, C08L 3/00, C08J 11/04, publ. 10.08.2009 year). The ratio of the components in the composition, in wt.%: waste polyethylene 67-76 (in Russian), 5, rice husk 20-30, titanium dioxide 0.5 to 1, oligomeric dye 1-2. Titanium dioxide is introduced into the composition to reduce its light fastness and, accordingly, to reduce the period of biodegradation of the material.
The disadvantages of this arrangement should be attributed to its low moisture absorption, low modulus of elasticity derived from it products, and high consumption of polymer.
New positive properties of the proposed compositions are higher water absorption and, consequently, a higher process speed of biodegradation, use as biodegradable material is inexpensive and available waste mechanical treatment of wood, a high concentration of biodegradable filler in the composition and, accordingly, in the products while maintaining acceptable mechanical properties.
The above results are achieved by the fact that in biodegradable compositions based on polyethylene and natural products processing of timber, containing polymer, lignocellulosic m is a material predetermined as a biodegradable filler, functional additives according to the invention as a lignocellulosic material use of wood flour as well as functional additives, bentonite, crosslinked polyvinyl alcohol, compatibilization and nano-sized particles of inorganic material in the following ratio of components in the composition, in parts by weight:
|crosslinked polyvinyl alcohol||3|
|nanoscale inorganic particles||4|
As compatibilizer use a copolymer of ethylene and vinyl acetate, as well as nanoscale inorganic particles precipitated iron hydroxide or calcium sulfate.
The purpose of the following functional additives. When contact is made from the compositions of the products with water she microscopic defects in the matrix polymer penetrates deep into the material to the surfaces of all particles, resulting in a gradual swelling able to this the components. When bentonite swell the volume of its particles increases 2-3 times, particles of polyvinyl alcohol (PVA) - 10-12 times. Due during the swelling of the particles local stresses in polymer formation of new defects, contributing to more rapid and deep penetration into the volume of material, water, air, microorganisms. Thus the conditions for biodegradation of wood particles and, accordingly, the mechanical destruction of the material as a whole. Under certain conditions, particles of bentonite play the role of "coupe" water for PVA particles. In addition, the bentonite has good dispersing properties.
Compatibilization, which is used as a copolymer of ethylene with vinyl acetate, are well combined in the melt with polyethylene and has a good adhesion to wood material. Therefore, the additive of this compatibilizer reinforce the polymer composition as a whole.
Nanoscale inorganic particles uniformly distributed in the polymer matrix, also increase its mechanical strength. This gives you the opportunity to add to the composition a greater amount of biodegradable wood flour without reducing the mechanical properties of products below an acceptable level and thereby ensure a more rapid destruction of the product in conditions arising, for example, in the disposal of used products is second on the polygons.
The ratio of mass fractions of components in the proposed composition and, primarily, between the shares of polymeric bases and biodegradable material selected within that create a heterogeneous system with valid values its viscosity at the operating temperature range of the melt and, consequently, the use of conventional technologies and equipment - mixers, extruders, injection molding machines for mixing and receipt of these products.
When determining the upper limit of the proportion of wood flour and the optimal consumption of functional additives considered valid technical specifications of the products to ensure the normal operation in normal conditions and at a given speed birthrate in terms of disposal after use.
At all stages of the process, including the preparation of raw materials and other components of the compositions, the preparation of intermediate products, final products, process control and measuring technical characteristics of the products is done using known techniques and equipment and subject to the requirements of the relevant Standards.
In the manufacture of compositions and products according to the examples use low-density polyethylene (LDPE), a copolymer of ethylene with vinyl acetate, wood throes of the faction 140-200 μm (Example 1) and less than 140 μm (Example 2), bentonite and PVA with a particle size less than 140 μm, calcium sulfate (Example 1), iron hydroxide (Example 2). The mixture of components is prepared in the mixer type "Brabander" within 10 minutes at a temperature of 140°C. the resulting mixture was cooled and crushed in the crushing device. From shredded using a press at a temperature of 140°C and a pressure of 60 kgf/cm2within 4 minutes to get a plate thickness of 1000 μm (Example 1), and the extruder with a slot die at a temperature of 170°C receive a film thickness of 200 microns.
For comparison, in the same conditions, get a plate thickness of 1000 μm of the composition of the prototype. Use fraction crushed in attrition mill rice husk 140-200 μm (Example 3).
The table shows the indicators of technological, mechanical and operational properties of the compositions and products made of them.
|Indicators of technological, mechanical and operational properties of the compositions and products made of them|
|no examples||The melt flow index (MFR)||The modulus of elasticity||Moisture absorption on the air 24 hours||Microbiological stability|
|Weight loss for 15 weeks||Scoring|
|3 (prototype)||3,9 (140°C)||180||6||8||2|
The manufacture of compositions and products on an industrial scale is carried out in the same manner as in the examples, using appropriate equipment performance. As the main raw material, it is preferable to recycle industrial and/or household waste polyethylene.
1. Biodegradable composition based on polyethylene and natural products processing of timber, containing polymer, lignocellulosic mother is l as a biodegradable filler,
functional additives, characterized in that as a lignocellulosic material use of wood flour as well as functional additives, bentonite, crosslinked polyvinyl alcohol, compatibilization and nano-sized particles of inorganic material in the following ratio of components in the composition, parts by weight:
|crosslinked polyvinyl alcohol||3|
|nanoscale inorganic particles||4|
2. The composition according to claim 1, characterized in that as compatibilizer use a copolymer of ethylene and vinyl acetate.
3. The composition according to claim 1 or 2, characterized in that as nanoscale inorganic particles used chemically precipitated iron hydroxide or calcium sulfate.
SUBSTANCE: rigid polyvinyl chloride (PVC) based wood-polymer composition contains a complex stabiliser, an impact strength modifier, wood flour and silicon sol as a binding agent, with the following ratio of components, pts.wt: polyvinyl chloride 100, impact strength modifier 4.8-9, complex heat stabiliser 4.5-7, wood flour 10-160, silicon sol 2-4.
EFFECT: obtaining highly filled rigid PVC compositions based on dispersed wood flour while preserving processing and operational characteristics.
SUBSTANCE: invention relates to wax dispersions in form of nanoparticles, used for hydrophobisation of lignocellulose- and/or cellulose-based materials. The wax dispersion contains water as a continuous phase, an emulsifying agent and wax which forms the dispersed phase. More than 85 wt % of the wax is made up of one or more long-chain hydrocarbons containing more than 20 carbon atoms on average, and the wax has hardening temperature ranging from higher than 40 to 150°C. The dispersed wax in form of solid particles has mean particle diameter from 10 to less than 500 nm. The wax dispersion is obtained by heating a mixture containing water, an emulsifying agent and wax to temperature higher than the melting point of the wax, and the molten wax is emulsified using a dispersant and then cooling to temperature lower than the hardening temperature of the dispersed wax phase. Hydrophobisation of materials is carried out by bringing said materials into contact with said wax dispersion and then pressing the material.
EFFECT: obtained wax dispersions contain a large weight ratio of a dispersed wax phase, are stable during storage and are resistant to shearing stress, provide a high hydrophobic effect compared to standard wax dispersions with the same content of wax.
23 cl, 3 tbl, 6 ex
SUBSTANCE: wood materials (i) contain polyamine as binder or binder different from polyamine. The wood materials additionally have polyamine inside or on their outer layer and the polyamine has average molecular weight of not less than 500 g/mol and has at least 6 primary or secondary amino groups per molecule of polyamine.
EFFECT: reduction of formaldehyde in ambient air.
6 cl, 1 tbl, 5 ex
FIELD: woodworking industry.
SUBSTANCE: formula of chip and glue composition for an internal layer in production of woodchip boards includes up to 40% of chips from wastes of rotting blanks with application of a binder based on a low-molar urea formaldehyde resin.
EFFECT: reduced material intensity of woodchip boards production, energy intensity of pressing process, increased efficiency of pressing equipment and reduced toxicity of produced boards.
3 tbl, 3 ex
SUBSTANCE: described is a composition for obtaining a binding agent for soaking cellulose fibres. The composition contains polyolefin resin which reacts with 1.6-4.0% maleic anhydride. The composition has less than 1500 ppm free maleic anhydride. The resin has melt flow index at 190°C and 2.16 kg ranging from approximately 0.1 to 500 g/10 min. The composition has yellowing index of 20-70. The polyolefin is polyethylene. Described also is a cellulose composite containing 10-90% cellulose fibre; a first polyolefin resin having melt flow index from 0.1 to 100 g/10 min; 0.1-10 wt % composition for obtaining the binding agent. The maleic anhydride is grafted on the polyethylene.
EFFECT: high binding efficiency of the binder.
12 cl, 8 tbl, 20 ex
FIELD: process engineering.
SUBSTANCE: invention relates to pulp of organic stuff particles for production of ligno-carbohydrate plastic. Said pulp comprises minced particles of conifer needle, coniferous branch bast peeling, timber and wastes of Siberian pine cones in various versions. Said pulp features improved extraction of active natural substances from said components to produced binder.
EFFECT: pulp of organic stuff particles for production of ligno-carbohydrate plastic at reduced temperature of thermal compaction.
11 cl, 11 tbl
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
SUBSTANCE: product contains the following in wt %: 1-50 modified hybrid resin based on natural fatty acids and 99-50 natural material selected from cellulose, wood, wood fibre, flax, hemp, starch and another natural fibre or combinations thereof. The product can contain 20-80 wt % thermoplastic, 30-70 wt % binder or natural adhesive. The hybrid resin is obtained via water-emulsion polymerisation of an acrylate monomer - butylacrylate, methyl methacrylate or butylacrylate, on an alkyde resin based on fatty acids in the presence of a radical initiator at 30-100°C. Fatty acids are selected from tall oil, suberin fatty acids, cutin fatty acids, vegetable oils and mixtures thereof. The composite product is obtained by mixing acrylate hybrid and natural material or combination thereof. Further, the product is moulded and hardened under heat at 120-200°C until a composite product of the given type is obtained.
EFFECT: invention enables to obtain composite plates with improved properties, good biodegradability and low toxicity; such properties of the plates are achieved by using modified hybrid resins in form of a stable aqueous emulsion as binding materials and compatibilisers.
22 cl, 1 tbl, 1 dwg, 9 ex
SUBSTANCE: moulding composition contains an aggregate made from carbon-containing crushed plant and/or synthetic fibre material, binder made from inorganic polymers and a target additive. The inorganic polymers used in the composition are metal phosphates with aluminium, chromium, boron and magnesium cations and anions РО4 --- or metal silicates with sodium, potassium and lithium cations and with anions SiO3 --, pre-modified with solutions of organic bases with an amide bond and/or oxides or trihydrates of aluminium oxide or mixtures thereof. The target additive is a water repellent or hardener or surfactant. The aggregate, working solution of the binder and target additive are prepared first. The aggregate is treated with the working solution, dried and moulded into briquettes.
EFFECT: ecologically clean, non-toxic, non-combustible slab materials which are resistant to aggressive media are obtained.
41 cl, 3 tbl
SUBSTANCE: composition contains the following, wt %: 0.05-6.9 (a) bisamide of saturated fatty acid with the structure: , where R1 and R2 are saturated hydrocarbyl groups with C11-C35; 0.14-7.6 (b) bisamide of unsaturated fatty acid with the structure: , where R3 and R4 are unsaturated hydrocarbyl groups with C11-C35; (c) dispersed cellulose material such as wood flour; (d) thermoplastic resin - flakes fractionated from molten high-density polyethylene (HDPE); (e) a finishing agent for finishing the cellulose material (c) with thermoplastic resin (d). The composition also contains an optional (f) inorganic dispersed material selected from pumice and talc and (g) a lubricant, separately or in a combination, selected from zinc stearate, sodium stearate, potassium stearate, paraffin wax or polyethylene wax.
EFFECT: invention enables to obtain composites with improved operational properties, ultimate bending strength and resistance to water absorption.
11 cl, 10 tbl, 31 ex
SUBSTANCE: invention relates to films made from a polyethylene composition and articles made from said films, such as shipping bags and sheet material. The film contains at least one component made from the composition, which contains a mixture of an ethylene-based high-molecular weight copolymer and an ethylene-based low-molecular weight copolymer. The ethylene-based high-molecular weight copolymer is a heterogeneously branched linear or homogeneously branched linear ethylene copolymer and C3-C20 α-olefins having density from 0.922 g/cm3 to 0.929 g/cm3 and flow melt index at high load I21 from 0.2 g/10 min to 1.0 g/10 min. The ethylene-based low-molecular weight copolymer is a heterogeneously branched linear or homogeneously branched linear ethylene copolymer and C3-C20 α-olefins having density from 0.940 g/cm3 to 0.955 g/cm3 and flow melt index I2 from 6 g/10 min to 50 g/10 min. The mixture has a single peak on an ATREF curve, is eluted at temperature higher than 30°C, has viscosity-average molecular weight coefficient (CMV), which is calculated at elution temperature in the range from 70°C to 90°C, less than -0.0032 in coordinates of log(calculated MV) of elution temperature.
EFFECT: obtained polyethylene films have good impact resistance determined using a drop-weight method, good tear resistance and excellent resistance to thermal and oxidation decomposition during manufacture and end use.
4 cl, 29 dwg, 56 tbl, 29 ex
SUBSTANCE: polyethylene composition contains ethylene and butene and has long-chain branching index (g'av.) from 0.5 to 0.9; melt flow index (MFI) higher than (49.011×IR(-0.4304)), where IR is melt index; and ratio of weight-average molecular weight to number-average molecular weight Mw/Mn less than or equal to 4.6. The method for gas-phase polymerisation of olefins to obtain said composition is realised in the presence of a catalyst system containing an achiral cyclic bridge metallocene catalytic compound and an activator - aluminoxane, modified aluminoxane or mixture thereof. Films containing said composition have good optical and shrinking properties. In particular, a film can have one or more of the following characteristics: longitudinal plastic shrinkage stress (MD) ≤0.08 MPa; Retromat surface shrinkage >60%; transparency >60%; relative internal turbidity ≤1.0%/mil (i.e. %/0.001 inch); turbidity <20%.
EFFECT: improved properties.
31 cl, 5 dwg, 10 tbl, 5 ex
SUBSTANCE: invention relates to a polyethylene film for making packaging, grocery sacks, trash can liners and produce bags. The film is made from a multimodal polymer composition obtained using a double metallocene catalyst and contains an ethylene homopolymer or a copolymer of ethylene and alpha-olefin comonomer or combination thereof and, optionally, additives and modifiers. The film is characterised by total energy dart drop, measured in accordance with ASTM D4272, greater than about 0.45 ft.lbf, dart drop impact strength, measured in accordance with ASTM D1709 Method A, greater than about 135 g, and moisture vapour transmission rate, measured in accordance with ASTM F1249 at 100°F and 90% relative humidity, less than about 0.85 g-mil/100 square inch/24 hour. Said tests are performed on a test specimen having a 0.8 mil thickness.
EFFECT: improved film properties.
20 cl, 2 dwg, 4 tbl, 4 ex
SUBSTANCE: invention relates to an ethylene and α-olefin copolymer obtained by reacting at least one metallocene catalyst on a support, ethylene and at least one other α-olefin in a gas-phase reactor. The copolymer has the following properties: density from 0.930 to 0.970 g/cm3; b) melt flow index from 0.7 to 200 dg/min; c) melt flow index ratio from 10 to 25; d) ESCR higher than 1000 h; e) 1% section modulus greater than 75000 psi; and f) molecular weight distribution less than 3.5. The copolymer has differential scanning calorimetry peak temperature represented by a single peak. Disclosed also is a composition for making moulded articles, an article and a method of producing an ethylene and α-olefin copolymer.
EFFECT: invention improves properties and processability of the ethylene and α-olefin copolymer.
33 cl, 1 dwg, 5 tbl, 3 ex
SUBSTANCE: composition has density ranging from 0.950 g/cm3 to 0.970 g/cm3, I21 less than or equal to 8, I2 from 0.02 to 2 dg/min, molecular-weight distribution Mw/Mn from 15 to less than 20, and contains 45-80 wt % high-molecular weight component and 55-20 wt % low-molecular weight component. The high-molecular weight component contains an ethylene and C3-C20 α-olefin copolymer with density from 0.920 g/cm3 to 0.950 g/cm3, I21 from 0.05 to 1 dg/min and Mw/Mn from 2 to 8. The low-molecular weight component contains an ethylene homopolymer with density from 0.965 g/cm3 to 0.985 g/cm3, I2 from 600 to 2000 dg/min and Mw/Mn from 2 to 6.
EFFECT: improved processing properties such as low weight of bottles, and improved physical properties such as high hardness of resin with minimal loss of stress cracking resistance and impact resistance.
26 cl, 3 tbl
SUBSTANCE: invention relates to a high-density polyethylene composition, preparation method thereof, articles made therefrom and a method of making said articles. The composition contains at least a first component which is a high-molecular ethylene and alpha-olefin copolymer, and a second component which is a low-molecular ethylene polymer. The composition has flow melt index (I2) of at least 1, density in the range of 0.950-0.960 g/cm3 and g' equal to or greater than 1. The first component of the composition has density in the range of 0.915-0.940 g/cm3 and flow melt index (I21.6) in the range of 0.5-10 g/10 min. The second component has density in the range of 0.965-0.980 g/cm3 and flow melt index (I2) in the range of 50-1500 g/10 min. The method of preparing the composition comprises the following steps: feeding ethylene and one or more alpha-olefin comonomers into a first reactor; (co)polymerisation of ethylene in the presence of one or more alpha-olefin comonomers in a first reactor to obtain a first component which is a high-molecular ethylene and alpha-olefin copolymer; feeding a first component and an additional amount of ethylene into a second reactor; polymerisation of the additional amount of ethylene in the second reactor to obtain a second component which is a low-molecular ethylene polymer. Articles made from the disclosed high-density polyethylene composition can be made through compression moulding, injection moulding or high-pressure blow moulding. Closing devices such as bottle caps, made from said high-density polyethylene composition are characterised by high cracking resistance due to environmental action.
EFFECT: bottle caps can withstand pressure of carbonated beverages, make easier the closing and sealing of bottles, and are characterised by optimum human force applied to twist-off the cap.
39 cl, 4 dwg, 4 tbl, 11 ex
SUBSTANCE: described is a method of obtaining an ethylene and alpha-olefin copolymer, where the method involves: bringing ethylene and at least one alpha-olefin into contact with a metallocene catalyst in at least one gas-phase reactor with pressure in the reactor ranging from 0.7 to 70 bars and at temperature in the reactor ranging from 20°C to 150°C, to obtain an ethylene and alpha-olefin copolymer during polymerisation, where the ethylene and alpha-olefin copolymer satisfies the following conditions: density equal to or greater than 0.927 g/cm3, melt flow index (I2) from 1 dg/min to 200 dg/min, (I21/I2) ratio from 15 to 40, molecular weight distribution Mw/Mn 2-4, ESCR of 500 hours or more if measurement is carried out in accordance with ASTM 1693/B in 10% Igepal solution, T75-T25 equal to or greater than 4, where T25 is temperature at which 25% eluted polymer is obtained, and T75 is temperature at which 75% eluted polymer is obtained, in an experiment with temperature rising elution fractionation (TREF) and F80 equal to or greater than 10%, where F80 is a polymer fraction which elutes below 80°C, where the metallocene catalyst is selected from a group consisting of: bis(n-propylcyclopentadienyl)hafnium Xn, bis(n-butylcyclopentadienyl)hafnium Xn, bis(n-pentylcyclopentadienyl)hafnium Xn, (n-propylcyclopentadienyl)(n-butylcyclopentadienyl)hafnium Xn, bis[(2-trimethylsilylethyl)cyclopentadienyl]hafnium Xn, bis(trimethylsilylcyclopentadienyl)hafnium Xn, dimethylsilylbis (n-propylcyclopentadienyl)hafnium Xn, dimethylsilylbis(n-butylcyclopentadienyl)hafnium Xn, bis(1-n-propyl-2-methylcyclopentadienyl)hafnium Xn, (n-propylcyclopentadienyl)(1-n-propyl-3-n-butylcyclopentadienyl)hafnium Xn; and where Xn is selected from a group consisting of halogen ions, hydrides, C1-12 alkyls, C2-12 alkenyls, C6-12 aryls, C7-20 alkylaryls, C1-12 alkoxy groups, C6-16 aryloxy groups, C7-18 alkylaryloxy groups, C1-12 fluoroalkyls, C6-12 fluoroaryls, and C1-12 heteroatom-containing hydrocarbons and substituted derivatives thereof. Described also is an ethylene and alpha-olefin copolymer, a composition containing said copolymer and an article obtained via rotational moulding, containing said composition.
EFFECT: obtaining an ethylene and alpha-olefin copolymer, having wide orthogonal distribution and high resistance to environmental stress cracking.
11 cl, 7 dwg, 4 tbl
SUBSTANCE: compositions are meant for making articles with high level of frost resistance and fire resistance - sealants, electric wire holders, cuffs, components of pneumatic, vacuum and hydraulic systems used in different industries. The thermoplastic elastomeric composition contains the following, wt %: fluoropolymer based on vinylidene fluoride - copolymer or mixture of copolymers with fluorine content of 50-70% - 57-70, thermoplastic polyurethane based on ester, 4,4-diphenylmethanediisocyanate and 1,4-butanediol - 24-35 and a copolymer of vinylacetate and polyethylene - the rest. The composition can additionally contain target additives - wollastonite, tetrafluoroethylene in amount of 1-5 wt %.
EFFECT: invention improves processing and elastic properties of the composition, fire resistance and frost resistance.
2 cl, 2 tbl, 1 ex
SUBSTANCE: invention relates to a processing additive for extrusion of polyolefins or thermoplastic resins. The composition contains at least one fluoropolymer (A), at least one inter-phase agent (B) and at least one stabiliser (C). The invention also relates to an extrusion method, which involves: (i) bringing the composition in solid state, as described above in any of claims 1-13, into contact with polyolefin or thermoplastic resin and (ii) extrusion of the mixture obtained at step (i) to obtain a film, pipe, relief or hollow body.
EFFECT: additive reduces or eliminates extrusion defects without reducing the yellowing index of the resin subjected to extrusion.
14 cl, 1 dwg, 1 tbl, 6 ex
FIELD: machine building.
SUBSTANCE: composition includes basic resin containing (A) first ethylene homo- or copolymer fraction and (b) second ethylene homo- or copolymer fraction. Also, fraction (A) has flow rate of melt MFR2 within the range from 300 to 600 g/10 min and lower average molecular weight, than fraction (B). Basic resin has density within the range from 0.945 to 0.949 kg/cm3, flow rate of melt MFR5 within the range from 0.2 to 0.4 g/10 min, contents of alpha-olefine co-monomer 2.0-6.0 wt % and index of reduction of viscosity at shear SRV (2.7/210) within the range from 66 to 90.
EFFECT: manufactured pipes and additional items for pipes have good balance of processability, impact resilience, modulus of elasticity, resistance to rapid growth of cracks and values of calculated stress.
15 cl, 1 tbl, 2 ex
SUBSTANCE: invention relates to chemical and food industry, particularly to production of biodegradable plastic materials and can be used to make moulded or film articles for various purposes, including food purposes. The polymer composition for moulding biodegradable articles from molten mass contains polyolefins, biodegradable filler - starch and a process additive, which is a protein phosphatide concentrate (or fuzz) - a by-product of production of unrefined sunflower or rapeseed oil.
EFFECT: obtaining a polymer composition which can decompose under the effect of environmental factors and can be digested by microorganisms, having good biodegradation properties, and also capable of reducing the cost of the product and power consumption during production.
2 dwg, 1 tbl, 3 ex