SU934374A1 - Method of evaluating distribution of modifier in mixture of partially compatible polymers - Google Patents

Description

The invention relates to the technology of production of polymer products and can be used in the development of formulations and preparation of compositions based on a mixture of several polymers. There is a method for estimating modifier distributions (substances in a mixture of partially compatible polymers by preparing compositions based on a mixture of polymers and substances of different quantitative contents, pressing the compositions, determining the quantitative content of a substance in each polymer using a phase contrast microscope with subsequent calculation of the distribution coefficient of the substance in each polymer, the mixture is based on their retention ratio of 1 J. However, the known method does not take into account the actual conditions of making the compositions, Whereas the selected polymers form an interface at the macro level and, moreover, is not applicable to the study of opaque compositions. The purpose of the invention is to create a method to evaluate the distribution of materials under realistic conditions for making compositions based on a mixture of compatible polymers and products made from them, i.e. the determination of the modifier in the filled and unfilled mixtures. The goal is achieved by the fact that in the method of estimating the distribution of the modifier {modifying additive, substance, material in and partially compatible polymers by preparing compositions based on a mixture of polymers with different content of modifier, pressing the compositions, determining the quantitative content of the modifier in each polymer and calculating the distribution coefficient of the modifier in each polymer mixture, preliminarily preparing a composition based on the base polymer incompatible with these polymers ( hereinafter, these polymers are named as incompatible polymers), and the same composition based on a mixture of the base polymer and each of polymers with different content of modifier, after pressing, determine the glass transition temperature of the compositions and plot it according to the content of the modifier in the compositions, determine the quantitative content of the modifier in an incompatible polymer using graphs of the same glass transition temperature of the compositions based on the base polymer and compositions based on a mixture of base and incompatible polymers, and the modulus distribution coefficient in each polymer of the mixture is partially compatible These polymers are calculated as the ratio of the modifier content in each polymer, determined using compositions based on base and incompatible polymers.

The distribution of materials in the mixture is limited to compatible rubbers, two of which (SKI-3 and SKS-30) also have closely lying glass transition temperatures.

Example. Sulfur distribution in mixtures of limited compatible SKD rubbers, SKI-3 with CKG-30 is determined. All compositions include, mac.: Rubber and 100.0; stearin 2.0; zinc oxide 5.0; NeoZon DG 0.5B A rubber was taken as the base polymer, which is incompatible with SKD, SKI-3 and SKS-30. In order to build the dependence of the glass transition temperature of SKN-0 on the amount of sulfur, 2.0 wt.h is additionally added to the composition. sulfur and .1.0 ma.ch. sulfenamide C, or mac. sulfur and 2.5 ma.ch. eulfenamide C, or 10 ma.h. sulfur and 5 ma.ch. eulfenamide C. Mixtures CKH-iO e each rubber contain by wt.h. sulfur and 2.5 ma.ch. eulfenamide C. Compositions are prepared by mixing on rollers for 12 minutes in accordance with the usual conditions e given by the consumer. 5 min. The temperature of sample elimination is determined using a torsion tiller. When deciding the schedule, the TC from the content of the eier in it when determining the real

Effective) concentration of sulfur in mixtures t 50% SKD containing 5 wt.h. sulfur, the T value of the CKH-i O phase in the SKD volume is deposited on the ordinate (T.) and the position of the T phase of the SKN- + O is determined on the graph of Tc versus its content. Then perpendicular to the abscissa axis, which characterizes the actual effective sulfur concentration in the SKN-40 phase, is set equal to, for this example, Cm.h. The effective concentration of eera in

SKN-AO for a unit of 50 s 50 SCS-30 effective concentration of 3.2 mash. for her 50% e 50% SKI-3 (effective concentration is 5, wt.h.) Therefore

for mixtures of CKH-ijO with comparable rubbers, the effective concentration of sulfur in the phases of the rubbers being compared is equal to mas.h .:

For phase SKD 6 For phase SKS-30 6.8 For phase SKI-3 k, 6

The sample production areas are identical, the base of the comparison is the same for its structure and structure, and therefore it is possible to compare the effective concentrations of ery in the rubber phases using a distribution coefficient equal to the ratio of the effective sulfur concentration in the rubber phase to the other rubber For the proposed examples, the distribution coefficients are:

SKS / SKI 1.48

K-§.8 1.13

SKS / SKD - 6

6

1,3

k: 6

The values of Kp are close to those available in the literature, obtained in a known manner, and for the SKD / SKI-3 system, the value of Kp is the same as that determined by the code used with the proposed one.

Claims (1)

A percentage determination of the distribution of sulfur in the phases of partially compatible rubbers is possible. If the amount of sulfur in both phases is taken as iOO%, then the sulfur content in the phases is,. %: For sks / eky in sks 59.65, in ski-3 0.35 for SCS / access control in SKS 53,12, in access control, 88 Dl SKD / SKI in access control 56,6, in SKI-3 For system from three rubbers sulfur distribution will be SKS / SKD / SKI-3 39.07 / 3.5 / 26.43. The method can be used to assess the distribution of modifiers (substances) under actual conditions for the manufacture of compositions and products based on mixtures of polymers, makes it possible to assess the distribution of materials under conditions of simultaneous physical (diffusion) and chemical (for example, vulcanization processes, allows to study optically opaque compositions. The calculations given in the examples show the possibility of predicting the properties of the products and their optimization when developing the recipe and compositing modes based on the mixtures used in processing technology, rubber and plastics, which will provide an improvement in the performance properties of the product. The method does not present any technical difficulties, since the mixture can be manufactured using conventional equipment, and tests are carried out using common determination of glass transition temperature of elastomers and plastics. Invention A method for estimating the distribution of a modifier in a mixture of partially compatible polymers by preparing a composition based on a mixture of polymers Emers with different modifier content, pressing the compositions, determining the quantitative content of the modifier in each polymer and calculating the modifier distribution coefficient in each polymer mixture, characterized in that, in order to estimate the distribution of the modifier in the filled and unfilled mixtures, the compositions are preliminarily prepared base polymer incompatible with these polymers, as well as compositions based on a mixture of the base polymer and each of these polymers c. after pressing, the glass transition temperature of the compositions is determined and its graphs are plotted against the content of the modifier in the compositions; determination of the quantitative content of the modifier in an incompatible polymer is carried out using graphs at the same glass transition temperature of compositions based on the base polymer and mixture based compositions base and incompatible polymers, and the coefficient of distribution of the modifier in each polymer mixture of partially compatible polymers is calculated as the ratio of the content of the modifier in each polymer, determined using compositions based on basic and incompatible polymers. Sources of information taken into account during the examination 1. Gardiner J.B. Curative diffusion betmeen dissimilar Elastomers nd influence onadhesion - Rubber hem.and Technol, 1968, y. 41, No. 5, p. 1312-1328 (prototype).