SU401197A1 - Method of manufacturing modified acetate fibre - Google Patents

Description

The invention relates to the manufacture of modified acetate fibers and articles thereof. A method is known for producing modified cellulose-based materials by introducing nitrogen-containing polyalkylaryl silo derivatives into a dope. However, the incomplete solubility of these modifiers and their limited compatibility with cellulose acetate in a common solvent make it difficult in the process of forming the fiber, especially with a high content of modifier, and cause relatively low physical and mechanical properties of the modified fibers. In order to stabilize the fiber spinning process and improve the complex of the product performance properties, it is proposed to use aryl alkyl hydrolysiloxanes, which have hydroxy groups in the molecule and a high content of aryl groups, as a modifying component. Due to this, complete modifiability of the modifier in common with acetyl, a halogen solvent and their structural compatibility are achieved. Hydroxyl-containing alkylaryl hydrolysiloxanes are characterized by a large dipole moment and an increased softening temperature, due to which the modified fiber has high strength, electrical conductivity and abrasion resistance. In this case, a more efficient reduction in the electrified fiber is achieved. Forming the modified acetate fiber is carried out according to the technological scheme and equipment of the acetate production. For example, a dissolving mixture is pumped into the spinning solution apparatus, into which 0.5% by weight of acetyl acetyl acetyl methyl acetate is loaded as the modifying component. After 15 minutes of stirring, the loading of the network is started.) Pulping to obtain a Spray solution (25iO, 3% concentration). The readiness of the solution is determined by analytical indicators, the corresponding regulatory. After threefold filtration, rezframe filter presses and subsequent deaeration in the spinning tank, the solution goes to the spinning process, which is carried out according to the dry-forming mode of the acetate fiber. At the same time, the breakage of the modified fiber is two times lower than that of the acetate one. The formed modified fiber goes through the same stages of textile operations as acetate fibers. In terms of physicochemical, electrical, and strength characteristics, the modified fiber containing 0% of alkylaryl hydropolysiloxane in its composition has a significant advantage over acetate. Its electrical conductivity is 40 times higher, and the electrostatic charge is 5 times lower than on acetate and is about 10 ° Ω -. cm and 7.9-1SG responsibly 3.1 .. -. ..., cool / cm. The abrasion resistance of the modified fiber is almost three times higher and is about 18,000 cycles, and the acetate fiber can withstand to complete discharge under the same conditions no more than 6000–7000 cycles. EXAMPLE 2 The test is carried out according to Example 1, but the content of the methylphenylhydropolysiloxane modifying agent (MFHPS) in the spinning solution is increased, which is 3% by weight of acetylcellulose. The modified fiber formed from such solutions has an electrical conductivity two orders of magnitude higher, and the electrostatic charge is an order of magnitude lower than the acetate one and is respectively 8.2 10 ohm cm, | -.- - g - - 1, 2-10 cu / cm. When ultraviolet is irradiated with violet rays for 4 hours, the modified fiber loses 37% strength and 52% elongation, and acetate, respectively, 75% and 91%. At. resistance to abrasion modified fiber can withstand three times more cycles compared to acetate. Example 3. The experiment was carried out as in Example 1, but the content of methylphenylhydropolysiloxane (MFGPS) was 10% by weight of cellulose acetate. This fiber has a strength of 10.5–10.8 p. Km. The conductivity of 10 ohm, cm, the value of the static charge below the sensitivity of the device, i.e. practically zero, therefore the modified fiber is not electrified. When irradiated under an ultraviolet lamp, it loses its strength by only 12% and elongation by 30%. When heat treated for 2 hours at 210 ° C, the loss of strength of a fiber containing 10% FGPT is 28%, and elongation is about 50%, while the acetate fiber is completely destroyed under these conditions. The modified fiber is superior to acetate in abrasion resistance by a factor of three. Example4. Triacetyl cellulose is used as a raw material, which in a mixture with hydromethylphenylsiloxane in a ratio of 96.5: 3.5 (by weight) is dissolved in a solvent of methylene chloride; ethyl alcohol (9: 1 by volume). The indicators obtained according to the usual technological regulations of the dry mold molding fiber are given in table. 1. Table

Thickness, tex (meter / number) Length discontinued, km

Explosive elongation,% in conditional conditions

in wet condition

Resistance to repeated bends, cycles

Abrasion resistance, cycles

, Linear density is more electrically charged, cool / m

11.8 / 85.0 10.7

23.8

31.4

318 1781 1.13-10 °

With {«1er5. Triacetylcellulose and hydromethylphenyl polysiloxane, which are dissolved in the solvent methylene chloride: ethyl alcohol, are used as the starting material.

The introduction of various amounts of hydromethylphenylsiloxa decreases in s93

83,115

Claims (2)

1. A method of obtaining modified acetate fiber and products from it by molding mixtures of cellulose acetate with polyorganosiloxanes containing reactive groups from solutions, characterized in that, in order to stabilize the prostate of the spinning solution and increase the concentration of equivalent solutions of a mixture of triacetylcellulose and hydromethylphenyl polysiloxane (see p. 2). This greatly increases the productivity of the equipment of chemical shops producing triacetate fibers. Table 2 The process of shaping the fiber and improving the complex of the operational properties of the products uses polyorganosiloxanes containing hydroxyl and alkoxy groups. 2. A method according to claim 1, characterized in that the polyorganosiloxanes take in an amount of 0.1-15% by weight of cellulose acetate.