Method for preparing acrylic fibre used for building
A construction, acrylic fiber technology, used in wet spinning, spinneret assemblies, textiles and papermaking, etc., to achieve the effects of increasing intrinsic viscosity, increasing temperature and drafting ratio, and improving product quality
Inactive Publication Date: 2009-09-02
浙江杭州湾腈纶有限公司
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[0005] In summary, acrylic fibers have been used in the construction industry, especially in concrete. In order to better play the role of acrylic fibers in the construction industry, the acrylic fibers used in construction are different from those used in the textile industry in terms of various properties. acrylic fiber, so more improvements need to be made on the preparation method to meet the needs of construction, and the existing literature has not disclosed a method for producing acrylic fiber specifically for construction
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Embodiment
[0023] Embodiment: the preparation method of acrylic fibers for construction in the present embodiment comprises the following steps successively:
[0024] a. Polymerization reaction, using acrylonitrile as the first monomer, vinyl acetate as the second monomer, and reacting under the redox system of sodium bisulfite-potassium persulfate, wherein the mass percentage of acrylonitrile is 88% to 92% %, preferably 91%, the mass percentage of vinyl acetate is 8%-12%, preferably 9%, the concentration of sodium bisulfite is 14-16%, preferably 15%, the flow rate is 630-635kg / h, Preferably 633kg / h, the concentration of potassium persulfate is 1.5-2.5%, preferably 2%, preferably 715kg / h, the soft water flow rate is 5020-5040kg / h, preferably 5033kg / h, the resulting polymer After washing and drying, the air is sent to the silo to obtain dry polyacrylonitrile powder (PAN) for spinning;
[0025] b. Spinning forming: take the above-mentioned polyacrylonitrile dry powder (PAN), use dimethyla...
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Abstract
A preparation method of acrylon for building use is provided, which is characterized in that the method comprises the following steps: (a) allowing polymerization of acrylonitrile as the first monomer and vinyl acetate as the second monomer in an oxidation-reduction system of sodium bisulfate and potassium persulfate, washing the produced polymer, oven-drying, and blowing to a stock chamber, obtaining PAN for the next spinning; (b) dissolving the polymer with dimethyl acetamide as solvent to obtain a polymer stock solution with a concentration of 23-26 percent, heating, extruding from pores of a spinneret, and performing double diffusion in a coagulating bath to obtain fiber precursor; (c) washing with water; (d) drafting under such conditions that the water tank temperature of a drafter is 80-98 DEG C and the drafting times is 6.1-6.5; (e) oiling; (f) oven-drying, cooling by a roll barrel with cooling water to obtain the final acrylon for building use. Compared with the prior art, by the improvement in preparation method of the prior acrylon and appropriate adjustment of parameters, the invention can produce acrylon with a tensile strength above 500MPa, meeting the national building standard.
Description
technical field [0001] The invention relates to a method for preparing acrylic fibers, in particular to a method for preparing acrylic fibers with a tensile strength exceeding 500Mpa. The acrylic fibers can be used in construction, for example, mixed into concrete in a certain proportion, which can improve the deformation resistance and durability of the concrete. Background technique [0002] Acrylic fiber is the trade name of polyacrylonitrile fiber in our country. Acrylic has excellent performance, soft and warm to the touch, and has good elasticity. Light fastness and weather resistance are particularly good. Generally made into short fibers. Available pure or blended with wool. It is used to make textiles, knitwear, blankets, tents, curtains and filter cloths, etc. Because its properties are close to wool, it is called "synthetic wool". Although acrylic fibers are usually called polyacrylonitrile fibers, acrylonitrile (customarily called the first monomer) only acc...
Claims
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IPC IPC(8): D01F6/38D01D5/06D01D4/00C08F220/46
Inventor 秦明志李春友张立涛杨波迟默然刘占明刘灿文
Owner 浙江杭州湾腈纶有限公司