Polymer composition

 

Describes a polymer composition comprising an aromatic polyamide phenylon " C-2 and ultra-fine oxynitride silicon-yttrium, which further comprises a carbon fiber surface-modified with chlorine (9,1% relative to the weight of the fiber), the following ratio, wt.%: carbon fiber - 10-20; oxynitride silicon-yttrium - 0,2-5; phenylon " With-2 - 75-89,8. This allows you to increase the strength of the composition under compression to 280-293 MPa. table 1.

The invention relates to polymeric compositions based on polyamides and mineral fillers and can be used for the manufacture of parts of mobile joints in engineering, chemical and other industries.

Known polymeric compositions based on aliphatic and aromatic polyamides, which contain mineral fillers include oxides of calcium and silicon (see "I. Mater. Sci", 1986, 21, 12, S. 4193-4198); carbonates, oxides of titanium and silicon (see Mineral couple plus qu'une charge. Un renfort. Stigter L. A. Plast. mod. elast., 1987, 39, 1, S. 17-20, Franz.), boron nitride (see Kravets N. I. , Trofimovich A. N., Prikhod'ko O. G., Tverdokhleb S. I. Influence of some additives on the properties of heat-resistant phenylon " /proc. Republ. scientific and technical. proc. "Priemnyh compositions are low wear resistance and mechanical properties.

Closest to the technical essence and the achieved result of the claimed invention is a polymeric composition based on aromatic polyamide phenylon " and ultrafine nitrogen filler oxynitride silicon-yttrium (Si₃N₄-Y₂O₃(see Storm O. I., Harlamova N. T., Cherskiy I. M. "Palmera composition" Application 97115510, IPC 08 L 77/00 from 17.11.97. Publ. Promyslova Vlasnist. Oftiny Bulletin 8, 1999 R (II castina) - Prototype). The degree of filling of aromatic polyamide with oxynitride silicon-yttrium is 0.2-5 wt.%. Famous composition has poor impact properties, compression strength and abrasion resistance.

The objective of the invention is to provide polymeric compositions by changing its composition in such a manner that the increase of the physical-mechanical properties and durability.

The problem is solved in that the polymer composition comprising an aromatic polyamide phenylon " p-2 (chemical name: poly-m-phenyleneterephthalamide) and ultrafine oxynitride silicon-yttrium (window), except oxynitride silicon-yttrium, further comprises a carbon fiber surface-modified chloro shall centred silicon-yttrium - 0.2 to 5 Phenylon "With-2 - 75-89,8 For the production of carbon fiber (HC) with the optimal concentration of chlorine (9,1% relative to the weight of the fiber), the fiber was treated with gaseous chlorine under pressure of 0.1 MPa (2.6 mol of chlorine per 1 kg fiber) at 293K for 8-10 minutes this forms the link between UV and chlorine and to the surface of the hydrocarbon attached chlorine atoms according to the scheme:The positive effect is ensured by the action of carbon fiber with the surface-modified with chlorine, which affect the structure of the aromatic polyamide of phenylon "- phenylon " p-2 (TU-6-05-221-226-72), confirmed methods roentgendifractometric and IR spectroscopy.

Example 1. The composition of phenylon " p-2 (89,8 wt. %), carbon (10 wt. percent) of the surface-modified with chlorine (Cl-HC) and powder oxynitride silicon-yttrium (0.2 wt.%) were prepared by mixing in a rotational electromagnetic field (0.15 Tesla) using ferromagnetic particles, which are then removed from the composition by the method of magnetic separation. The composition was dried at 453 K for 1 h and processed into products by the method of compression molding in the following mode: loading the composition into a mold preheated to 528; heating up to 598 K and 5 min, cooling the mold to 523 K, repressive products.

Research conducted by the following methods. Impact strength was determined by Charpy method according to GOST 4647-80 on pendulum impact-testing machine KM-0,4 when 232^oC and relative humidity (505)%. The yield strength in compression of the polymer composition was determined according to GOST 4651-78 on samples in the form of a cylinder size: height (150,5) mm diameter (100,5) mm Wear of the samples was determined at 298 K on a disk block in dry friction mode on the machine 2070 SMT-1, the counterbody - steel 45, heat-treated to hardness 48-50 HRC, diameter - 50 mm Specific load in the experiments was 1 MPa sliding speed 0.8 m/s, the friction path - 1000 m To the weighing carried out the same processing and pre-break sample. The wear of the samples was determined on an analytical balance VLR-200 with accuracy is 0.0002, the Number of experiments is 15.

Example 2. The composition of phenylon " p-2 (89 wt.%), CL-HC (10 wt.%) and powder boxes (1 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1.

Example 3. The composition of phenylon " p-2 (85%), Cl-HC (10 wt.%) and powder boxes (5 mee 1.

Example 4. The composition of phenylon " p-2 (89,8 wt.%), Cl-HC (17 wt.%) and powder boxes (0.2 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1.

Example 5. The composition of phenylon " p-2 (89 wt.%), Cl-HC (17 wt.%) and powder boxes (1 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1.

Example 6. The composition of phenylon " p-2 (78 wt.%), Cl-HC (17 wt.%) and powder boxes (5 wt.%) prepared, processed into products and examined according to the Standards and methods described example 1.

Example 7. The composition of phenylon " p-2 (79 wt.%), Cl-HC (20 wt.%) and powder boxes (1 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1.

Example 8. The composition of phenylon " p-2 (75 wt%), Cl-HC (20 wt.%) and powder boxes (5 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1.

Example 9. The composition of phenylon " p-2 (90,9% by weight), Cl-HC (10 wt.%) and powder boxes (0.1 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1.

Example 10. The composition of phenylon " p-2 (73 wt.%), Cl-HC (21 wt.%evidendy in example 1.

Example 11. The composition of phenylon " p-2 (95 wt.%) and powder boxes (5 wt.%) prepared, processed into products and examined according to the Standards and methods described in example 1. The properties of the polymer compositions of the present invention and known compositions (prototype) in the table.

Analysis of the results shown in the table, allows us to conclude that the claimed composition on the basis of phenylon " C-2 exceed the known toughness 32-54 MPa, wear - 9.6-20,5 times, toughness - 3-38% of the Correctness of the selected components is confirmed by the control examples 9-10.

Due to the high physical-mechanical properties and wear resistance of the polymer composition can be used for the manufacture of parts movable joints agricultural machinery, metallurgical and chemical equipment.

Claims

Polymer composition comprising an aromatic polyamide phenylon " C-2 and ultra-fine oxynitride silicon-yttrium, characterized in that in addition to oxynitride silicon-yttrium, it further comprises a carbon fiber surface-modified with chlorine (9,1% relative to the weight of the fiber), followed by the d