RU2483895C1 - Low-flammability moulding composition based on polypropylene and articles made therefrom - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: present invention relates to a low-flammability moulding composition based on polypropylene as well as fibre and a film made from said composition.

EFFECT: invention reduces flammability of polypropylene without deterioration of physical and mechanical properties of the obtained low-flammability polypropylene granulate as well as articles based thereon.

3 cl, 1 tbl

Description

The invention relates to a low flammability molding composition based on polypropylene (PP), as well as to a fiber and a film obtained from this composition.

Currently, products based on PP polypropylene are in demand, this is due to the fact that PP fiber is characterized by low specific gravity (0.91 g / cm ³ ), high strength and abrasion resistance, low moisture absorption, good light resistance and resistance to microorganisms, low thermal conductivity, chemoresistance. Wide areas of use of PP present special requirements for reducing fire hazard. Heating the PP for 30 minutes at a temperature of 410 ° C leads to its almost complete destruction. In this regard, the issue of reducing the combustibility of PP is relevant at the present time.

PP belongs to the group of flammable materials and is characterized by an oxygen index (CI) = 17.4. Of all the known methods for reducing flammability, the most promising for PP is the method of introducing combustion retardants (MH) of various compositions into the melt.

All known MHs, as a rule, have common disadvantages:

- low KI of the obtained products based on PP low combustibility, as a rule, equal to approximately 20;

- the need for the introduction of large quantities of PG, which makes it more expensive to obtain products from PP with reduced combustibility;

- reduction of physical and mechanical properties of finished products from PP with low combustibility;

- the use of certain ZG complicates the process of obtaining products from PP with reduced flammability, and can also lead to increased wear of equipment.

From 2009115713/05, IPC: C08L 97/00, publ. September 24, 2007, a composition with reduced flammability based on PP is known. However, to obtain a high KI of the composition, it is necessary to introduce a large amount of ZG, which cannot but affect the physicomechanical properties and the cost of the finished product.

From 2006129131/04, IPC: C07F 9/40, publ. 02/20/2008, a composition is known to reduce the flammability of composite polymer materials. The disadvantage of this composition is its high viscosity, which causes difficulties in its further processing.

Thus, there is a need for a new flame retardant composition to reduce the combustibility of PP, which will eliminate all of the above disadvantages.

The technical result of the invention is to reduce the combustibility of PP without reducing the physico-mechanical properties of the obtained granulate PP with reduced flammability, as well as products based on it.

The specified result is achieved by the fact that the molding composition contains, wt.%:

Granulate PP - 87.0

m-Phenylenediamine - 0.33

SiO ₂ - 0.35

Fe ₂ O ₃ - 0.45

CaO - 0.80

MgO - 0.78

Na ₂ O - 0.58

K ₂ O - 0.58

Paraffin - 0.80

Soot - 2.41

Antioxidant - 1.0

Dye - 4.0

Talc - the rest.

The specified technical result is also achieved due to the fact that from the specified molding composition by extrusion molding receive a fiber or film.

The analysis of a trial batch of PP granulate with reduced flammability showed the following results:

Characterization of the obtained granulate No. p / p Name of indicator Properties of the finished product one Granule size mm 2.0-2.5 2 Density, kg / m ³ 940-950 3 PTR, g / 10 min 480-520 four Bulk mass of granules, kg / m ³ 8-10 5 Oxygen Index,% 26, 5

As can be seen from the table, the obtained granulate has a high KI, as well as insignificant changes in physical and mechanical properties, which leads to the use of the obtained granulate PP in the production of various products based on it having low combustibility, without compromising the basic physical and mechanical properties.

Thus, the claimed group of inventions has a "novelty", "inventive step", as well as "industrially applicable".

Claims (3)

1. Molding composition with reduced flammability based on polypropylene (PP), containing, wt.%:
Granulate PP 87.0 m-phenylenediamine 0.33 SiO ₂ 0.35 Fe ₂ O ₃ 0.45 Cao 0.80 MgO 0.78 Na ₂ O 0.58 K ₂ O 0.58 Paraffin 0.80 Soot 2.41 Antioxidant 1,0 Dye 4.0 Talc Rest 2. The product obtained by extrusion molding from the composition according to claim 1, which is a fiber. 3. The product obtained by extrusion molding of the composition according to claim 1, which is a film.