SU427957A1 - METHOD OF OBTAINING CURED 5 POLYESTERS - Google Patents

Description

one

A known method for the preparation of solidified polyesters by copolymerization of unsaturated polyesters with a structuring agent, for example viyl monomer, in the presence of an organic saturated peroxide.

However, the use of vinyl MOIHOlgеровgers and organic saturated peroxides for the curing of nol-ethers is not efficient enough, since the process is rather long and does not produce polymers of a certain structure.

In order to improve the process, it is proposed as a structuring agent and peroxide initiator using; peroxide-functional1: .sh oligomer based on peroxide monomer of the formula CH2CH-C-C-CRiR, -OORs

CH2 SG1-COOR, where R, and R2 CH3, CoH3, C (CH3) 7, CgHr ,:

R C (CIi) 2C2H5; Rs - Н, -СНз, С (СНз) з

Peroxiofunctional oligomers are directly obtained by polymerization of unsaturated peroxides or hydroperoxides of this formula in a coordinated phase, solutions or aqueous emulsions or copolymers with their vinyl or diene measures and their mixtures. The molecular weight of the resulting oligomers can range from 250 to 1000.

In addition, peroxide monomers can be dissolved in polyesters; or heating at the usual temperature using an oxy-redox system of the ion and a third-dimensional three-dimensional copolymerization, simultaneously copolymerizing C1 along the double bond.

The structuring of gametoxides and numbers takes place after decomposition of peroxides or hydronerexes: subsoil and recombination of radicals.

Such aktivniye otverditglp, gepe 1ir | u radicals, initiate three-dimensional measurement and simultaneously form part of the ghgrolrolkoleku with (; brazovaiem trekh.meoyoyoy structure.

The use of oligomeric non-acidic oxides of varying degrees of oligomerization, a varying amount of active nonsrex groups, allows you to adjust the curing rate and create three-dimensional structures and a certain structure.

The following substances are used as starting materials for lsnol.

Peroxide monomers. Dimethyl ester methyl methyl methyl hydroperoxide No-C CH-C-C-C (CH 3) 2-0: OH I, content of active oxygen, 12.6% (theoretically 12.68%), t.kip. 35 ° C at 0.05 mm Hg. Art., 1.4770 (according to literary data 1.4780), 0.965 (Lit. 0.965). Dimethylvinylethylmethyl-g / Eg-butylperoxide H2C (CH3) 2 - O: O - --C (CH3) 3P, containing active oxygen 8.7% (theoretically 8.78%), b.p. 28 ° C pr.ch 0.5 mm RT. v .; / g, 1,4482 (lit. 1,4480); fif2 0.867 (lit. 0.867).

Oligon peroxide. Oligo-Greg-BG / Tilperacrylate

- - SNG-SNN

WITH

OOC (CI-i3) 3

obtained by thermal polymerization of tertiary butyl leracrylate —CHz — CH — —CO — OC) —C (CH3) s at 40 ° C in the presence of free radical scavengers (purified from acetone solution in petroleum ether); has the following characteristics; characteristic viscosity T 0.147; content of active oxygen Oz 8.7 wt. %

Oligodimethyl vinyl ethemethyl-t-butyl peroxide is obtained by thermal polymerization of CHg CH-C C-C (CH 3) 2 -OO-C (CH 3) 3 at 70 ° C, purified from bepzol solution in methyl alcohol, has the following characteristics: g 0.067 and Od 6 , 7 weight. %

Peroxide coolant measures of styrene. The peroxide co-solvent of styrene and dimethylviiylethynylmethyl-t-butyl peroxide is obtained by copolymerising them at 70 ° C in the presence of benzoyl peroxide and dodecylmercapta, after cleaning it has an intrinsic viscosity T) 0.045 and contains active oxygen of 3.58 wt. % Dimethylvinyl ethylmethylhydroperoxide and styrene peroxide co-oligomer is taken into account by their thermal copolymerization at 70 ° C and after cleaning it has t) 0.059 and 02 3.2 weight. %

The ratio of hydroperox (peroxide) monomer and styrene in the original mass of the mixture in mol.

Polyester lacquer PE-246 is a product of condensation of ethylene glycol, propylene glycol, maleic and phthalic anhydrides.

PN-1 polyester resin is a condensation product of diethylene glycol with phthalic and maleic acid hydrides.

Cobalt naphthenate is used as a 1.5% solution in styrene.

D and methyl l aniline obtained by distillation of a technical product, after purification, has the following characteristic: c / j 0.9558 (lit. 0.9557); 1.558 (lit. 1.5582).

Data on the curing of unsaturated polyesters using peroxide monomers and oligomers based on them are given in the table.

From the table it is seen that the proposed initiators generate free radicals at different temperatures, depending on the nature of the peroxide moieties; an increase in the amount of peroxide monomer and oligomer in the initial mixture from 1 to 5 weight. % shortens cure time

about 30-40%, with an increase in the concentration of oligoneroxystirol from 1 to 3 weight. % in PE-246 lacquer, the hardness of the coating increases from 0.243 to 0.416. one

Subject invention

The method of obtaining solidified polyesters by copolymerizing unsaturated polyesters with a structuring agent in the presence of a peroxide initiator, characterized in that, in order to improve the process, as a structuring agent, and simultaneously with a peroxide

initiator use peroxide-functional oligomer based on peroxide monomer of the formula

CH2 CH - С С-CRiRz-ООКз or СН2 СН-COOR;

where RI n Rs SPZ, CrH, C (CH3) 2 or

SbND;

R-C (CH3) 2C2H5; RS H, CH3, C (CH3) h.