SU1370119A1 - Method of producing dipping articles by method of ion deposition - Google Patents

Abstract

The invention relates to latex technology, in particular, to a method of making dipped articles by the method of ion deposition. The invention makes it possible to reduce the stage of preparation of the coagulum fixative from 25-30 to 20-22 h, reduce the consumption of coagulant from 45-50 to kg / 1000 pairs of electric gloves and its cost due to its use as a coagulant. eectroplet, part of the coagulum nf-fsator, bishpfl l p number of Z-che ma.ch, for 100 May. h . Coagulum nta. 1 tab.

Description

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1137

The invention relates to latex technology, in particular, to a method of making dipped articles by the method of ion deposition.

The purpose of the invention is to intensify and reduce the cost of the process.

A widely used method of making dipped products in the industry by ion deposition involves treating a mold with a coagulum with a fixative containing an electrolyte, in particular calcium nitrate. However, the use of calcium nitrate requires the preliminary melting of salt, the subsequent dissolution of the melt in water and the transfer of the salt solution to the preparation of coagulant, which increases the duration of the process, requires additional labor and equipment, as well as associated with the use of a relatively expensive product.

In the proposed method, bischofite is used as an electrolyte, which is part of the coagulum nt a-fixative a, 25-45 wt.h. on 100 ma.ch. coagul nta-aixator

Bishofit-chloromagnesium brine of natural bischofite is magnesium hexahyl chloride with a high content of magnesium, chlorine and bromine, a significant content of calcium, sodium and potassium, the presence of appreciable amounts of strontium, manganese, iron, well dissolved in water. From natural deposits, bischofite is obtained by the method of underground dissolution followed by pumping the solution to the surface. Thus, the chlorine blueness brine has a density of 1.30-1.32 t / m, a viscosity of 6-8 cPa and is characterized by the following chemical composition, wt.%: Magnesium chloride 21.01-52.52 Magnesium bromide 0.37 -0.94 Calcium Chloride 0.20-0.51 Potassium Chloride 0.08-0.20 Chloride by three 0.06-0.15 Sulphate of potassium 5.03-0.07 Calcium carbonate 0.02-0.05 Calcium bicarbonate O, OIK), 03 Barium oxide 0.002-0.006 Water Else

The 1 st shofit dosage range is optimal, since its dosage reduction is below 25 ma.h per 100 mah. The coagulum causes a decrease in the coagulation rate, a decrease in the thickness of the layer of the deposited gel and the need to increase the dipping time, and with an increase in the dosage of bischofite above 45 mph. by 100 mph., coagulation increases the rate of coagulation, at which the loosening of the gel appears and the quality of the products decreases.

Example 1. Getting rubber gloves dielectric seamless.

Heated to 60-80 ° C porcelain form, modeling in appearance the product obtained, is immersed for 1-3 minutes in a coagulum nt-fixer with a temperature of 30-40 ° C. A coagulum nt-fixer is prepared by mixing 16 wt.h. kaolin, nab the best at 44 ma. The mind of the gchennoy water for 1 day, with 40 mach. bischofite containing 52.52% magnesium chloride, and then allowed to mature for 20-24 hours at ambient temperature. After removing the form from the coagulum latch, rotating it to evenly distribute the coagulant and drying the latter by blowing forms with hot air, immerse the form in the latex mixture IL-45 based on latex natural centrifuged HA-UO type for 12-16 minutes. The gel which is laid down in shape is compacted with air (1-2 minutes) and water syneresis with running water heated to 40-60 ° C to seal it. Then the gel on the forms is dried and vulcanized at 75-125 ° C in a three-section drying-vulcanization chamber, and then cooled. The glove is removed from the mold, washed from the coagulant, and treated with a polystyethylsiloxane liquid.

The dielectric gloves obtained are characterized by the following physicomechanical indicators: Conventional tensile strength, mPA 2 Elongation at rupture,% 800

Residual elongation at break,% 10

Co; tear resistance, kN / cm30

At the same time, the duration of the operation of the p; 1 coagulum preparation is 22 hours at an electrolyte consumption of 40 mas.

PRI mme R 2. Getting rubber surgical gloves.

The porcelain mold is immersed in a solution of coagulum-fixative, obtained by mixing 2.5 parts by weight. kaolin, 72.5 May, h ethyl alcohol and from May 25, h. Bischofite containing 36,12% magnesium chloride, the fixer layer forming in shape is dried and the mold is immersed in a latex mixture based on natural latex. As a result of the interaction between fixation cations and emulsifier, the latex coagulates to form a uniform layer of a so-called raw gel which is subjected to 15 air syneresis, then washed with water, dried and vulcanized,

The resulting products are characterized by the following physicist mechanical indexes -20:

Conditional strength

at stretching, MPa 26

Relative extension

at break, 7.750 25

Relative residual lengthening after rupture,% 17

PRI me R 3 Obtaining rubber technical gloves (acid resistant), 30

The porcelain form is immersed in a solution of a coagulum of the composition ixator, nas, h: kaolin 2.0; ethyl alcohol 53.0; Bishofit 45.0 with a content of 52.52% magnesium chloride, and after scrubbing for a few seconds, is exhausted, held for a certain time and immersed successively in a chloroprene mixture and in a mixture based on natural latex. After Q coagulation, the resulting crude gel subjected to air ry and water blue-rezieu, dried and vulcanized.

The resulting products are characterized by the following physicomechanical factors:

Conditional strength

at stretching, MPa 18

Relative extension

when empty,% 850 CQ

Relative residual

elongation after rupture,% 11

Tear resistance,

kN / cm25

Example 4, Production of household gloves with a nap.

Forforvuyu form immersed in a solution of coagulant-fixative composition, May, h: ethylaurol 0.02; water is gchenna 74.98; Bishofit 25.0 with the basic substance content of 39.31%. Then the form, after drying, of the forming fixative layer, is immersed in a latex mixture based on natural latex. After coagulation and heat compaction of the resulting raw gel, the form is immersed in an adhesive latex mixture based on natural latex of the type Qualtex with the addition of carboxymethylcellulose and then cotton wool is applied. Thereafter, drying and vulcanization are carried out. The resulting products are characterized by the following physicomechanical indicators: Conventional tensile strength, MPa18

Elongation after rupture,% 650 Relative residual elongation after decomposition,% 20

Comparative data on the known and proposed methods are given in the table,

The use of bischofite as an electrolyte in the production of dipped articles by the method of ion deposition eliminates the operation of molten salt and its subsequent dissolution and thereby intensifies the process, as well as eliminates the use of relatively expensive calcium nitrate. The resulting products are characterized by properties at the level of products obtained by coagulating the latex with known electrolytes.

Formula inventions

A method of making dipped articles by the method of ion deposition, which includes processing the form with a coagulum fixative containing electrolyte, dipping into the latex mixture, drying, curing and removing from the form, characterized in that, in order to intensify and reduce the process, the electrolyte is used the amount of 25- 45 May, h, per 100 mach. h, coagulum nta-fixer,

Indicator

Way

ElectrolyteBischofite

The duration of the preparation stage of the coagulum fixative, h

Coagulant flow,

kg / 1000 dielectric pairs

glove gloves

Cost of coagulant, rub / 1000 pairs of dielectric gloves

Proposed

Famous

A solution of CaC, CaCNO,) ,, and others.

25-30

45-50

15-17

Claims (1)

Claim A method of manufacturing dipped products by the ion deposition method, including processing the mold with a coagulant fixer containing an electrolyte, dipping into the latex mixture, drying, vulcanizing and removing from the mold, characterized in that, in order to intensify and reduce the cost of the process, bischofite in the amount of 2545 wt is used as an electrolyte .h. per 100 parts by weight coagulant fixator. Indicator Way Proposed Famous Electrolyte The duration of the preparation of the coagulant fixative. h Coagulant consumption, kg / 1000 pairs of dielectric gloves Coagulant cost, rub / 1000 pairs of dielectric gloves Bischofite A solution SaS1 _2, Ca (N0,) ₂ and others. 20-22 25-30 40-42 45-50 6-8 15-17