Additive for thermoplastics to reduce their flammability and the method of its production

 

(57) Abstract:

The invention relates to the chemistry and technology of additives to thermoplastics, reduce the Flammability of polymers, and can be used in the chemical industry. Additive for thermoplastics to reduce their Flammability contains the layered silicates of the type modified by intercalation of organic flame retardant. As the layered silicate may be used kaolin, as well as organic flame retardant - triphenylphosphine, triphenyl or melamine with the following content of components (weight%): organic flame retardant 50 - 70, kaolin 30 - 50. Also described is a method of obtaining supplements. The additive is highly hydrophobic, which prevents it from leaching from the polymer composition. The introduction of the additive significantly increases the oxygen index of the polymer compositions. The polymeric materials do not lose their physical and mechanical properties. 2 S. p. f-crystals, 1 table.

The invention relates to the chemistry and technology of additives to thermoplastics, reduce the Flammability of polymers, and can be used in the chemical industry.

A method of producing flame retardant for thermoplastics, comprising mixing faceste phosphorus-containing agent use phosphoric acid or acrylic ester of phosphoric acid, as organic compounds - paraformaldehyde or trioxane, while phosphorus-containing agent is dissolved in an organic solvent. The interaction of the mixture is carried out at a temperature of 120oC (application Germany N 2739843, class C 08 G 8/08, 1979).

The compositions containing the flame retardant obtained by this method have low Flammability, but over time the flame retardant additive migrates to the surface of the composition, which leads to increased Flammability and deterioration of the operating characteristics of the composition.

This drawback is devoid of known additive for thermoplastics to reduce their Flammability containing organic flame retardant (RF patent N 2010802, class C 08 F 8/40, 1991). In the production of this additive liquid and powder components (dimethylpyrimidinol acid and polyvinyl alcohol, respectively) are mixed, then heated the mixture to a temperature of 80 - 100oC with constant stirring, maintain the mixture at this temperature for a specified time, depending on the weight of the loaded ingredients, after which the reaction mass is then cooled to 20 - 50oC.

However, this additive has limitations on temperature conditions of extrusion and can be used the turn imposes restrictions on the operating conditions of the polymer composition.

The technical result obtained by the implementation of the proposal is that the proposed additive is highly hydrophobic, which prevents it from leaching from the polymer composition, and as a result in the expansion of the field of operation of the latter. The proposed additive also has good compatibility with polymers, which finds the widest application in the industry, and does not change during processing of the obtained compositions. Polymeric materials containing the proposed addition, do not lose their physical and mechanical properties.

To achieve the specified result of the additive to thermoplastic to reduce their Flammability containing organic flame retardant further comprises the layered silicates of the type modified by intercalation of organic flame retardant. As layered aluminosilicate type additive may contain kaolin, as well as organic flame retardant - triphenylphosphine, triphenyl or melamine, with the following content of components (weight%): organic flame retardant 50 - 70, kaolin 30 - 50.

As a result of implementation predlagaemy method provides the same technical result.

To do this, in the melt of triphenylphosphine, triphenyl, at a temperature of 90 - 110oC, or in a concentrated solution of melamine in ethanol, at the boiling point of ethanol, and continuous stirring powdered kaolin until 30 to 50 wt.%, stirring is carried out for 16 to 30 hours, after which the melt is cooled and crushed to powder.

The time of the process depends on the humidity of the used kaolin and the temperature of the process.

The feasibility of the invention is illustrated in the following examples of its implementation in the laboratory.

Example 1. 140 g of triphenylphosphine is poured into a beaker from heat-resistant glass with a volume of 200 ml, provided with a mechanical paddle stirrer. Triphenylphosphine is melted, and the melt temperature is brought to 100 - 110oC. With stirring at 50 to 80 rpm in the melt poured 60 g of kaolin with a particle size of 0.16 mm Duration of 20 - 24 hours. At the end of the process, the melt is cooled and ground to powder.

Example 2. 250 g of triphenylphosphine, 250 g of kaolin, Cup volume 500 ml, process conditions as in example 1.

Ave. asplan cooled and crushed.

Example 4. 50 g of triphenyl, 50 g of kaolin, process conditions as in example 3.

Example 5. To a solution of 50 g of melamine in 100 ml ethanol at the boiling point of ethanol is added 50 G. of powdered kaolin. Boiling while stirring is continued for 25 - 30 hours. At the end of the process, the excess ethanol is evaporated and the residue finally dried in a desiccator under reduced pressure to remove residual solvent. The resulting product is ground to powder.

While heating and stirring of the mixture is the introduction of organic component in the interlayer space of aluminosilicates.

The combustion of the polymer from the interlayer space of the modified aluminosilicate in the melt of the burning polymer moving molecules of the flame retardant with the subsequent generation of active ingredients that reduce the combustibility due to inhibition of active radicals radical chain reactions in the gas phase. Fragments of molten polymer, interacting with particles of aluminosilicate form on the surface of the burning polymer coke layer, which affects the processes of heat and mass transfer, which contributes to the suppression dissolved, and the Basilica of the molding machine. The extrusion is carried out under conditions, not different from the processing of relevant industrial brands the original polymers.

The table shows the characteristics of Flammability of polymeric materials using the proposed additive obtained according to example 2.

From the table it follows that the introduction of the proposed additions significantly increases the oxygen index of the polymer compositions, which is a fundamental criterion not combustibility. From the above data also shows that the greatest effect is achieved using additives to thermoplastics such as ABS, polystyrene and nylon, 6. The parameters UL (UL94) also argue in favor of the proposed additions and the highest value is achieved by the use of the latest in thermoplastics such as ABS and polystyrene.

The production process additives can be carried out at the enterprises of chemical industry, producing organophosphorus compounds, in standard chemical equipment.

1. Additive for thermoplastics to reduce their Flammability containing organic flame retardant, characterized in that it is a kaolin modified intercalate and the following ratio of components, wt.%:

Organic flame retardant - 50 - 70

Kaolin - 30 - 50

2. The method of obtaining additives to thermoplastics to reduce their Flammability, mixing the liquid and powder components and heating the mixture under continuous stirring, characterized in that as the liquid component using a melt of triphenylphosphine or triphenyl at 90 - 110oWith or concentrated solution of melamine in ethanol at the boiling point of ethanol, and as a powder - kaolin and conduct continuous mixing while adding powdered kaolin until 30 to 50 wt.% within 16 to 30 h, after which the melt or the solution is cooled or evaporated and crushed to powder.

 

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