SU1796640A1 - Plasticizing mixture for polyvinyl chloride compositions - Google Patents

Description

The invention relates to the field of production of polymeric materials and can be used in the manufacture of plasticized polyvinyl chloride (PVC) compositions.

It is known to use dicyclohexyl ester of adipic acid as a plasticizer of PVC compositions. It is fraught with technological difficulties. which are due to the fact that adipic acid dicyclohexyl ester has a pour point of about 36 ° C. This necessitates a thorough and continuous heating of the plasticizer storage tanks and communications for its transportation to the processing site.

The closest technical solution is a plasticizing mixture based on dicarboxylic acid esters. The plasticizer is a mixture of di- {2 ethylhexyl) -phthalate and butylbenzylphthalate. However, such a plasticizer has an elevated temperature of combination with a PVC resin and has an increased migration from a PVC material to a contact medium, and PVC films made from such

composition, characterized by reduced thermal stability and deformation at break and a noticeable loss of mass when heated for 6 hours at 100 ° C.

The aim of the invention is to reduce the temperature of the combination of polyvinyl chloride resin with a plasticizing mixture and to improve the physicomechanical characteristics of the polyvinyl chloride composition and the films obtained from it and increase the thermal stability.

To achieve this goal as a dicarboxylic acid esters, the plasticizing mixture contains a mixture of dicyclohexyl esters of succinic, glutaric and adipic acids in the following ratio, wt.%:

Succinic acid ester 3-20

Glutaric acid ester 6-55

Adipic acid ester Remaining up to 100%

A mixture containing 61 g of adipic acid, 30 g of glutaric acid, 9 g of succinic acid and 200 g of cyclohexanol is charged into a 0.5 L flask equipped with a stirrer, a Dean-Stark nozzle and a reflux condenser. The mixture is heated in the presence of a catalyst, removing the released water. The end of the reaction is determined by the cessation of changes in the acid number of the reaction mixture. Unreacted cyclohexanol is distilled off from the esterificate, the residue is distilled under vacuum in the temperature range 185-210 ° C (4-5 mm Hg) to obtain 218 g of a colorless oily liquid, which is a mixture of dicyclohexyl esters of dicarboxylic acids of the composition, mes.%

Adipic acid ester59

Glutaric acid ester31

Succinic acid ester 10

A plastisol PVC composition is obtained by mixing the components in a planetary mixer at a mixer rotation speed of 60 rpm for 45 minutes. The compositions of the PVC compositions in the control experiment (prototype) and in experiments using a mixture of dicyclohexyl esters of succinic, glutaric and adipic acids as plasticizers are shown in Table 1.

Use the PVC composition as follows. The prepared plastisol is applied to glass plates using a laboratory doctor blade, producing films 0.3 mm thick. The films are cured in a heating cabinet with a fan at 170 ° C for 15 minutes, cooled, and their physical and mechanical characteristics are determined.

The invention is illustrated by the following examples (see table 2): example 1 - according to the prototype, 2, 9-13 - according to the invention, 3-8, 14-16 - for comparison.

Data on the dependence of the properties of PVC composites and plastisol films on the content of dicyclohexyl ethers of dicarboxylic acids in the plasticizer are given in Table 2.

Claims (1)

Claim A plasticizing mixture for polyvinyl chloride compositions containing dicarboxylic acid esters, characterized in that, in order to reduce the temperature of combining the polyvinyl chloride resin with a plasticizing mixture, to improve the physicomechanical characteristics of the polyvinyl chloride composition and films obtained from it, and to increase thermal stability, as dicarboxylic acid esters contains a mixture of dicyclohexyl esters of succinic, glutaric and adipic acids, in the following ratio of components, wt.%: Succinic acid ester 3-20. Glutaric acid ester 6-55 Adipic ester 1 ^Γ : 1Ηί _; Ί η Table 1 Components of PVC Composition (. '. and ·; zchts. · to <> me nta PVC composition, may •% KO'I pn.ib (prototype) according to the invention PVC E 62 43.6 43.6 PVC MS 700 2 C 18.7 18.7 Dioctyl phthalate 18.7 - Butylbenzyl Phthalate 12.5 - Lead-containing thermal stabilizer 1.5 1.5 Epoxidized Soybean Oil 1.87 1.87 BCP Thinner 3.13 3.13 A mixture of dicyclohexyl esters of succinic. glutaric and adipic acids ... 31,2 Table 2' Example - The content of dicyclohexyl esters of dicarboxylic acids in the plasticizer, May. % Properties PVC compositions and plastic films migration of the plastifier into the contacting medium, $ mass loss mass loss when heating the film for 6 hours at! 00% deformation at break % thermostability period at 1 70% (until yellowing, min) temperature of combination with PVC, % glutaric amber adipic 1 (prototype) Dioctyl phthalate + butig benzyl phthalate 0,060- 0, 100 co 72 60 122 2 31 10 The rest is up to 100 ‘^ 0,025 0,075 71.52 80 92 ZK thirty 2 Also 0,025 0,075 73, to ₃ 60 92 Ak 53 21 0,030 0.105 7't, 51 90 87 5k 5 12 0,025 0,0725 35L7 70 96 6k 58 12 0,060 0,080 74.31 80 86 7k 57 21 -1'- 0,065 0,110 74.27 90 86 8k 5 2 - ¹ * - 0,020 0,070 39.5k fifty 96 9 12 19 0,020 0,080 67, k8 90 9k 10 6 thirteen "AND. 0,025 0.075 42.35 80 95 eleven 55 fifteen 0,052 0,075 74.28 90 87 12 31 3 0,025 0,070 72.82 70 93 thirteen thirteen 20 0,025 0,095 68.59 90 93 1cc 100 - 0,060 0,080 73.88 90 Ek 15k - 100 - 0,03 0.160 42.16 100 85 16k - - 100 0.02 0,070 39.01 60 110 Compiled by V. Preobrazhensky Editor T. Ivanova Tehred M. Morgenthal Corrector N. Revskaya Order 630 Circulation Subscription VNIIIPI State Committee for Inventions and Discoveries under the SCST S.SSR 113035, Moscow. Zh-35, Raushskaya emb. 4/5 Production and Publishing Plant Patent, Uzhhorod, Gagarin St. 101