Polymer composition

 

(57) Abstract:

Describes a polymer composition comprising polyethylene and 4-alkoxy-2-hydroxybenzophenone as sitosterolemia, characterized in that the composition comprises low density polyethylene or a mixture of high-pressure polyethylene in a ratio of 24 : 1, and optionally contains ether 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid and pentaerythritol, and Tris(2,4-di-tert-butylphenyl)postit as stabilizers, and calcium salt of 1-(3-sulfophenyl)-3-methyl-4-azo-(3,4-dichloro-6-sulfophenyl)-person-5 as sitosterolemia in the following ratio, wt. %: low density polyethylene or a mixture of high-pressure polyethylene in a ratio of 24 : 1 98,55 - 99,57, 4-alkoxy-2-hydroxybenzophenone a 0.125 - 0.75, ester 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid and pentaerythritol 0,09 - 0,1, Tris(2,4-di-tert-butylphenyl)postit 0,09 - 0,1, calcium salt of 1-(3-sulfophenyl)-3-methyl-4-azo-(3,4-dichloro-6-sulfophenyl)-person-5 with 0.125 to 0.75. The technical result is an increase in resistance of the composition to light aging. table 1.

The invention relates to stabilized polymeric compositions based on polyolefins (polyethylene and eetu to light aging.

It is known that polyethylene and its copolymers in the processing and exploitation under the influence of high temperatures, solar radiation, atmospheric oxygen lose their physico-mechanical, physico-chemical and rheological properties.

In industry use of stabilizing additives that increase the resistance of polymers to UV radiation.

Known polymer composition comprising polyethylene, light 4 - alkoxy-2-hydroxybenzophenone, thermo stabilizer, as it contains polyethylene high density polyethylene, thermo stabilizer 5-imino-3-tion-1,2,4-dithiazole (xanthomonad) in the following ratio, wt.%:

The high-pressure polyethylene - 99,25 - 99,65

4-Alkoxy-2-hydroxybenzophenone - 0,25 - 0,50

5-Imino-3-tion-1,2,4-dithiazole (xanthomonad) - 0,10 - 0,25

[USSR author's certificate N 1142485, class C 08 L 23/06, 1985].

This polymer composition has poor resistance to light aging.

Closest to the technical essence is a polymeric composition comprising a polyethylene or a copolymer of ethylene with vinyl acetate, light 4-alkoxy-2-hydroxybenzophenone and dopolnitelnye ethylene-vinyl acetate - to 99.00 - of 99.75

4-Alkoxy-2-hydroxybenzophenone - 0,125 - 0,50

Tetramethylthiuramdisulphide (thiuram D) - 0,125 - 0,50

The disadvantages of this composition are: the use of toxic compounds - turama D, poor lightfastness.

[USSR author's certificate N 939483, C 08 L 23/04,1982].

The objective of the invention is to provide a polymer composition having improved resistance to light aging.

Technically, this task is solved in that the polymer composition contains a low density polyethylene or a mixture of high-pressure polyethylene as sitosterolemia: 4-alkoxy-2-hydroxybenzophenone as thermal stabilizers: ester of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid and pentaerythritol; Tris (2,4-ditertbutyl) FOSFA. In addition, sitosterolemia composition contains a calcium salt of 1-(3-sulfophenyl)-3-methyl-4-azo-(3,4-dichloro - 6-sulfophenyl)-person-5 in the following ratio, wt.%:

Low-pressure polyethylene or a mixture of high-pressure polyethylene in a ratio of 24 : 1 - 98,55 - 99,57

4-Alkoxy-2-hydroxybenzophenone (benzene OA) - 0,125 - 0,75

Ester of 3,5-di-tert-butyl-4 hydroxyphenylpropionic Ki the th salt of 1-(3-sulfophenyl)-3-methyl - 4-azo-(3,4-dichloro-5 - sulfophenyl)-person-5 (pigment) - 0,125 - 0,50

Tris(2,4-di-tert - butylphenyl)postit - white kristallicheskii powder with a melting point 180-185oC. it is soluble in benzene, chloroform, methylene chloride; poor in cyclohexane, hydrocarbons; insoluble in acetone, methanol, water. Thermally stable, non-toxic, not fire dangerous. Permitted for use in polymers in contact with food products. Structural chemical formula:

< / BR>
Ester of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid and Penta-erythrite (Irganox 1010, Shiba-Geigy, Switzerland). White crystalline powder. Thermo stabilizer. Permitted for use in polymers in contact with food.

< / BR>
4-Alkoxy-2-hydroxybenzophenone (Benzene OA TU 6-14-197-70).

< / BR>
Yellow viscous liquid. Light of polyolefins. Permitted for use in polymers in contact with food.

Calcium salt of 1-(3-sulfophenyl)-3-methyl-4-azo-(3,4-dichloro-6 - sulfophenyl)-persona-5 has the following chemical formula:

< / BR>
This yellow pigment, representing crystalline powder, resistant to light, water, acetone, benzene, ethyl alcohol, not toxic. Allowed for polymers, contact-dichloro-6-sulfonanilide. When diazotoluene amine is treated with hydrochloric acid and sodium nitrite. The resulting diazotype mixed with heterocyclic compound 1-(3 - sulfobenzoic)-3-methylpyrazole in an alkaline environment. Upon completion of the reaction the reaction mixture is stirred in water with the addition of calcium salts.

IR-spectroscopic study confirmed the compliance of the IR spectrum of the substance its structural formula.

In the IR spectrum of the substance is observed absorption bands corresponding to fragments of the molecule, namely:

- SO3when the phenyl nucleus has absorption bands 1205, 1180, 1125, and 1045 cm-1.

HE (hydroxyl group) is identified by a broad absorption band of stretching vibrations VOH at 3490 cm-1. -N=N-(isogroup) has the absorption band of stretching vibrations at 1430 cm-1.

-Ph-Cl (chlorine substituted phenolic core) is characterized by the absorption band 1055 cm-1.

-CH3(a methyl group) has absorption bands of stretching vibrations of VnCH3and V2CH3at 2930 and 2855 cm-1respectively.

Phenyl core has a series of absorption bands in the infrared spectrum, the most characteristic of which belong in identificirala three main absorption bands at 1560, 1490 and 1340 cm-1.

On the basis of the conducted analysis it is possible to ascertain full compliance with the IR spectrum of the investigated substance its structural formula. The infrared spectrum was obtained on an IR spectrophotometer UR-20 by K. Zeiss Jena. [A. Smith, Applied infrared spectroscopy. - M., Mir, 1982. S. 328].

The invention is illustrated by the following specific examples:

Example 1. To obtain stable polymer compositions take low-pressure polyethylene, brand 289-159, enter a stabilizing additives: Irganox 1010, postit, benzene OA, pigment and mixed on a roll mill at a temperature of 1605oC, frictions 1:1,2, time of mixing for 10 min in the following ratio, wt.%:

HDPE - 98,9

Irganox - 0,1

Postit - 0,1

The benzene OA - 0,6

The pigment-TO - 0,3

Examples 1A, 1B, 1C, g

Similar to the previous example of the composition of polyethylene, the ratio changes stabilizing additives, the content of the pigment is from 0.1 to 0.75 wt.%.

Example 2. To obtain stable polymer compositions take the mixture of HDPE and LDPE in the ratio of 24:1, enter a stabilizing additive mode and a ratio similar to that of example 1.

Examples 2A, 2B, 2C, g additives, the content of the pigment is from 0.1 to 0.75 wt.%.

Example 3 the prototype. A polymer composition was prepared in a mode similar to the previous examples, in the following ratio, wt.%:

HDPE - 94,8

HDPE - 4,0

Irganox 1010 - 0,2

The benzene OA - 0,5

Thiuram - 0,5

Examples 4, 5, 6.

Polymer stabilized composition was prepared in a mode similar to the previous examples using other known stabilizing additives: benzene OA - 0.5 wt.%, delayintolerant (DLTDP) - 0.5 wt.%, tinuvin - 0.5 wt.%.

[USSR author's certificate N 1125220, C 08 L 23/04, 1984].

Processing the obtained polymer composition sheet material is carried out by pressing in a hydraulic press at a temperature of 180oC and a pressure of 140 to 150 MPa. Evaluation of the effectiveness svetosobirayushchikh additives produce resistance to oxidative aging according to GOST 16337-77. Plate of the resin composition is irradiated with a mercury-quartz lamp CES-400 at a temperature of 35oC, the irradiation intensity 200002000 LK and exposure time of 300 hours. After exposure of the wafer was cut up samples of a spatula according to GOST 11202-80 and perform physical-mechanical testing machine Napryazhenii and elongation at break before and after irradiation. The results of the tests are presented in the table (see the end of the description). For comparison also the results of tests of polyethylene stabilized by other effective stabilizers.

From the table it is seen that the proposed polymer composition on the basis of HDPE and a mixture of HDPE and LDPE, light fastness than the known compounds. So, after 300 h exposure of mercury-quartz lamp strength of compositions, stable turama, benzene OA, DLTDP, tinuviel, reduced 41.5-46,3%, elongation at break at 48,0 was 74.3%. In the proposed compositions of examples 1, 1a, 1B, 2, 2A, 2B at the optimum content of stabilizing additives and the proposed stabilizer pigment in the amount of a 0.125-0.50 wt.% ultimate tensile stress at break is reduced by 31.6-34,1%, elongation at break 11.8-15,0%. When the content of stabilizing additives above and below the limit values, examples 1G, 1B, 2G, 2B, lower absolute values of tensile strength and relative elongation at rupture and increases their change after irradiation, respectively, by 43.7-48,4% and 32.0-40,6%, i.e., insufficient number of stabilizing additives, as well as its excess reduces the effect is to obtain a synergistic svedeteliami effect.

The content in the polymeric composition "oven" additives allows to obtain a polymer with high thermal stability for industrial applications.

Obtained permanent polymer composition can be used for the production of gas pipes made of low pressure polyethylene with a distinctive yellow stripe in accordance with the International standard.

Polymer composition comprising polyethylene and 4-alkoxy-2-hydroxybenzophenone as sitosterolemia, characterized in that the composition comprises low density polyethylene or a mixture of high-pressure polyethylene in a ratio of 24:1, and optionally contains ether 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid and pentaerythritol, and Tris(2,4-di-tert-butylphenyl)postit as stabilizers, and calcium salt of 1-(3-sulfophenyl)-3-methyl-4-azo-(3,4-dichloro-6-sulfophenyl)-person-5 as sitosterolemia in the following ratio, wt.%:

Low-pressure polyethylene or a mixture in the ratio 24:1 - 98,55 - 99,57

4-Alkoxy-2-hydroxybenzophenone - 0,125 - 0,75

Ester of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid and pentaerythritol - 0,09 - 0,1

Tris(2,4 Razon-5 - 0,125 - 0,75

 

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