Plasticizer for polystyrene and its copolymers

 

(57) Abstract:

Usage: chemical industry, in particular upon receipt of polystyrene and its copolymers. The inventive use of 1,1,3-trimethyl-3-phenylindane as a plasticizer for polystyrene and its copolymers. table 1.

The proposed plasticizer refers to a substance introduced into polystyrene polymers with the purpose of giving or improve fluidity, elasticity, plasticity under conditions of processing and use.

There are various plasticizers for plastics, among the most important of which are the esters of aromatic and aliphatic carboxylic acids, ethers of glycols and monocarboxylic acids, esters of phosphoric acid, polyesters, epoxydecane connection, vaseline, vegetable oil [encyclopedia of polymers. M. 1974. so 2, S. 620-627]

Known plasticizers receive in a complex technological environment with the use of scarce, expensive raw materials.

The most widely used as a plasticizer for polystyrene plastics has dioctylphthalate (DOP, GOST 8728-77), medical vaseline oil (MWM, GOST 3164-78) [Rusakov B. N. Production of polymers. M High school, 19 consumption and deficit.

Known 1,1,3-trimethyl-3-phenylindane, saturated cyclic dimer of alpha-methylstyrene or crystalline methylstyrene dimer, which finds application as a fluid for transformers, as well as to obtain high-temperature heat transfer fluids.

Specified substance is one of the 4 isomers of dimeric compounds alpha-methylstyrene, does not contain olefin-unsaturated bonds and is inactive as a polymerization modifier, unlike 3 other isomers such as 2,4-diphenyl-4-methyl-1-penten, CIS - and TRANS-2-4-diphenyl-4-methyl-2-penten that are olefin-unsaturated, and are active as polymerization modifiers.

The objective of the invention is the use of the dimer of alpha-methylstyrene as a plasticizer for polystyrene and its copolymers, which permits to reduce consumption and scarcity, to expand the range of known plasticizers.

The problem is solved through the use of 1,1,3-trimethyl-3-vinylidene as a plasticizer for polystyrene and its copolymers obtained suspension and block-suspension methods.

The application of the proposed substances for a new purpose based on the increase Yasnaya a high degree of compatibility of proposed and known materials due to chemical similarity, and the fact that the dimer meets the requirements of plasticizers. The property is inactive for polymerization can be used for the introduction of plasticizer at the stage of polymerization, which is the most technologically advanced, does not affect the molecular-mass characteristics and other properties of the synthesized materials.

Under normal conditions, 1,1,3-trimethyl-3-phenylindane is a solid crystalline substance, soluble in most organic solvents, and styrene and its copolymers. Melting point 52-54oC, the boiling temperature at a residual pressure of 0.1 mm RT.article 118-120oC.

The dimers of alpha-methylstyrene are non-toxic. The possibility of poisoning is created mainly due to the receipt in the air steams of residual monomer, which has a MAC in the air of working zone 5 mg/m3. The content of residual monomer in the dimer-0.2 to 0.04% of

The proposed plasticizer has available raw materials and simple technology of synthesis in comparison with the known, which promotes its use.

Application of the proposed plasticizer is illustrated by the following examples.

Example 1. The offer is th way).

In a reactor with a stirrer download demineralized water content of 0.75% Mg(OH)2. Then under stirring download styrene in the amount of calculation of the phase ratio of monomer: water=5:3. Pre-dissolved in the monomer and 1.0% of 1,1,3-trimethyl-3-phenylindane; 0.2% of benzoyl peroxide; 0.08% of tertbutylbenzene. The polymerization is carried out at 90oC until complete solidification of the bead. The obtained polymer was dehydrated and dried. To assess the plasticizing action of the plasticizer determine the melt flow index of the polymer (VKT) by extruding the molten polymer at a temperature of 200oC through the die plate under a load of 5 kg with subsequent measurement of the amount spilled polymer in g/10 minutes during polymerization fix the kinetics of the process in order to assess the possible impact of a new plasticizer. The relative viscosity of the polymer is determined using a viscometer. The resistance is determined by exposure of the polymer in the injection molding machine for 15 minutes at a temperature of 230-250oC. the data Obtained are given in table.

Example 2. Analogously to example 1. The amount of plasticizer 0,5%

Example 3. The proposed plasticizer use the technology for production of expandable polystyrene is atora; 0.1% of benzoyl peroxide and conduct the polymerization at 90oC to conversion 35-40% Then load 0.5% tetrabromphenol; 0,55% benzoyl peroxide; the aqueous phase with a content of 0.9% polyvinyl alcohol and conduct the polymerization under stirring at a temperature of 80oC 5 h 85oC 1 h, 95oC 1 h

The resulting polymer is dewatered, dried and analyzed as in example 1 at a load of 10 kg and a temperature of 170oC.

Example 4. The proposed plasticizer use the technology for production of high impact polystyrene type COC (block-suspension method).

In a reactor with a stirrer download 100% styrene; 0.5% plasticizer; 4% polybutadiene rubber; 0.025% of benzoyl peroxide; 0.3% benzole; 0.05% of tertiary laurylsarcosine and conduct the polymerization in mass to conversion 22-28% Then download 0,225% benzoyl peroxide; 0,15% of tertbutylbenzene and 100% of demineralized water containing 0.7% of Mg(OH)2; 0,3% MgSO4. The polymerization in suspension is carried out at a temperature of 90oC until complete solidification of the bead. The polymer is dewatered, dried and analyzed as in example 1.

Example 5. The proposed plasticizer used in the production technology of a copolymer of styrene with Acrylonitrile type SAN-P (UB>20,45% CaCl20.1% of pH 8 to 11. Then load the oil phase based oil: water 1: 1. The ratio of monomers: styrene - 80% Acrylonitrile and 20% relative to the sum of the monomers of the oil phase contains a peroxide Laurila -0,4% tertbutylbenzene 0,09% tertiary dodecylmercaptan of 0.2% offer plasticizer 0.5% of the Copolymerization is conducted at a temperature of 68 + 2oC complete solidification of the bead. The resulting copolymer is dewatered, dried and analyzed as in example 1.

Example 6 (control). Analogously to example 2. As a plasticizer use of MBM in the amount of 3.0%

Example 7 (control). Analogously to example 5. As a plasticizer use of MBM in the amount of 3.0%

Example 8 (control). Analogously to example 6. As a plasticizer use of MBM in the amount of 3.0%

Example 9 (control). Analogously to example 1. As the plasticizer used DOP in the amount of 3.0%

Example 10 (control). Analogously to example 1. The plasticizer is missing.

Example 11 (control). Analogously to example 6. The plasticizer is missing.

Example 12 (control). Analogously to example 3. The plasticizer is missing.

As can be seen from the table, the proposed plasticizer DSMI (examples 7-10) and in comparison with these same types of polymers without the use of plasticizers (examples 11 to 14) better plastificator polystyrene plastics of various types, as evidenced by higher values of melt flow index. The consumption of the proposed plasticizer significantly lower than known.

Data presented in table show that the plasticizer does not adversely affect the molecular weight and thermal stability of the polymers, as well as on the kinetics of polymerization and copolymerization.

The use of 1,1,3-trimethyl-3-ferndene as a plasticizer for polystyrene and its copolymers expands the range and reduces the deficit plasticizers.

The use of 1,1,3-trimethyl-3-phenylindane as a plasticizer for polystyrene and its copolymers.

 

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