SU526634A1 - Composition for the preparation of films based on complex mixed cellulose ether - Google Patents

Description

The invention relates to the field of obtaining products from mixed cellulose ethers and can be applied in the manufacture of film products and plastics with improved performance properties for the electrical, audio and automotive industries. The known composition for plastics and pulp materials based on cellulose esters, which, to improve the strength of the product, contains an additive of cellulose ether 1 polymer. The indicated addition contributes to the improvement of the working properties of the product from the sturdy composition to shock loads. A significant disadvantage of plastics and base materials based on acetobutares and adheterprolionato in cellulose is their low resistance to light. The propensity to rapidly decrease the molecular weight of cellulose ether under the action of light means that it reduces the service life of the products. Additives to the base material of a composition of cellulose derivatives such as ethyl cellulose do not increase the light resistance of the product. A known cellulose ester composition containing polymer light stabilizer 2. A disadvantage of such a composition is the limited light resistance of the films, the possibility of a decrease in light resistance during liquid treatments, and a limited range of application of the light stabilizer due to its yellow color. In order to improve the light fastness of the obtained films, the comzoscoeta contains X-ethyl-β-phenyl 3-amino-2-o "cypropyl cellulose ether acetate as the stabilizer, with the following ratio of the components, wt. %: C and l and y and with m and a and t s and cellulose ether 8,0-9,0 Acetate N-ethyl-N-phenyl 3-a of mino-2-oxy 1 Prope left cellulose ether 1,0-2, 0 Solvent Remaining Acetate-ethyl-; phenyl-3-amino-2-ox-1-propyl cellulose ether is a white powdery product, along with acetyl containing a certain amount of aromatic amino groups. It is pacTBOpiHM in organic solvents, it is well dispersed in the powder of the mixed cellulose ether mixture when mixed during the compounding process of the composition, compatible with it in solution.

When obtaining plastic masses or film materials, other targeted additives (plasticizers, antioxidants, solvents, etc.) may be selected depending on the product application area.

Ingredients Included:

cellulose acetobutyrate (ACB) —connected oily acid content of the oil is 41%, OH-content, 1.22%, specific gravity; bone, 0.65;

and cellulose cetocropioate (ADC) —the content of the associated pro-ionic groups is 55.9%; the content of the bound acetic acid is 5.61%, the content of free OH-groups is 2.34%, and the specific viscosity is 0.79.

Polymeric light stabilizer — acetate ethyl ethyl-phenyl-3-amino-2-oxynopropyl ether of cellulose (AEFC) —a powder, in white, soluble in a number of organic solvents. The content of bound acetic acid is 50.7%, containing 1.24% amine nitrogen, specific viscosity of a 0.25% solution in methylene chloride-ethanol (9: 1) at 20 ° С 0.541.

The solvent is methylene chloride or its mixture with a number of possible targeted additives that dissolve the polymer light bilizator and complex mixed cellulose ether.

Example. Cooking Comm.

A mixture of cellulose acetobutyrate or cellulose acetropionate with a polymeric light stabilizer, when broken, is dissolved in a solvent until a clear, homogeneous solution is obtained.

The number of components listed in the table.

Stabilized flakes are obtained after evaporating 1 and the solvent by conventional methods.

Lightness psychic tests of films are carried out on an IP-L-3 device when irradiated with a PRK-2 mercury-quartz lamp. Light resistance is determined by the change in the specific viscosity of a 0.25% aqueous solution of the film material in a mixture of methylene chloride - ethanol (9: 1) at 25 ° C before and after irradiation.

The table shows the results of testing films obtained from a series of compositions for lightfastness (solvent removal).

Specific viscosity of KO.MiiO3nmiii film solutions after irradiation, hours

Remark: P-solvent.

As can be seen from the data, and use in the composition is less than 1.0 weight. % polymer light stabilizer ineffective. On the other hand, the addition of more than 2 weight. % stabilizer does not increase the lightfastness of the films obtained from these compositions. Thus, from the experimental data, it follows that the limiting amounts of a poly-dimensional light stabilizer in a room: 1-1 is from 1 to 2 wt. %

Formula is invented and

A composition for producing films based on a complex mixed cellulose ether, a limeric light stabilizer and a solvent, characterized in that, in order to increase the light fastness of the films obtained, the composition contains as a light stabilizer L-ethyl-M-phenyl-3-amino-2oxypropyl cellulose ether acetate in the following ratio komioiento.v weight. %: Complex mixed

cellulose ether8.0-9.0

Acetate M-ethyl-M-feiilz-amino-2-oxylpropyl ether of cellulose 1.2-2.0

SolventExtra

Sources of information taken into account in the examination:

1. Auth. St. Ho 346308, SOVI 21/08. 1973. 2. Auth. St. Afg 410031 C 08B 27/68, 1974.