阅读说明：本技术 一种废聚酯纤维制品中混纺材料的分离除杂方法 (Separation and impurity removal method for blending material in waste polyester fiber product ) 是由 邢喜全 马哲峰 顾君 郭学伟 杜芳 于 2019-10-22 设计创作，主要内容包括：本申请涉及废聚酯纤维制品回收再生领域,尤其涉及一种废聚酯纤维制品中混纺材料的分离除杂方法。一种废聚酯纤维制品中混纺材料的分离除杂方法,该方法包括以下的步骤：1)所用的废聚酯纤维制品,通过开松机进行开松处理；2)选用沸点20-230℃的有机溶剂,以温度20-180℃对开松后的废聚酯纤维制品充分接触浸渍,溶解聚酯之外的易溶纤维,然后进行过滤,并从滤液中以蒸馏或分馏方式回收有机溶剂,循环使用。本申请采用有机溶剂溶解法在链解之前就将废旧聚酯中的尼龙、氨纶去除,处理方法简便,节约了能源的损耗,且分离效果好,效率高,易于实施。(The application relates to the field of recycling of waste polyester fiber products, in particular to a separation and impurity removal method for a blending material in a waste polyester fiber product. A method for separating and removing impurities from blending materials in waste polyester fiber products comprises the following steps: 1) the used waste polyester fiber products are subjected to opening treatment through an opener; 2) selecting an organic solvent with a boiling point of 20-230 ℃, fully contacting and dipping the loosened waste polyester fiber product at a temperature of 20-180 ℃, dissolving soluble fibers except polyester, then filtering, and recovering the organic solvent from the filtrate in a distillation or fractionation mode for recycling. The method adopts an organic solvent dissolving method to remove the nylon and spandex in the waste polyester before chain decomposition, has simple and convenient treatment method, saves the energy loss, and has good separation effect, high efficiency and easy implementation.)

1. A method for separating and removing impurities from a blending material in a waste polyester fiber product is characterized by comprising the following steps:

1) opening the waste polyester fiber product through an opener;

2) selecting an organic solvent with a boiling point of 20-230 ℃, fully contacting and dipping the loosened waste polyester fiber product at a temperature of 20-180 ℃, dissolving soluble fibers except polyester, then filtering, and recovering the organic solvent from the filtrate in a distillation or fractionation mode for recycling.

2. The method of claim 1, wherein the organic solvent comprises one or more of dimethylacetamide, N-dimethylformamide, dimethylsulfoxide, diethyl ether, xylene, N-butanol, formic acid, m-cresol, triethylene glycol, tetrahydrofuran, 1-ethyl-3-methylimidazole bromide salt, trifluoroethanol, benzenediol, o-dichlorobenzene, cyclohexanone, cyclopentanone, acetone, and N-methylpyrrolidone.

3. The method for separating and purifying the blending material in the waste polyester fiber product as claimed in claim 1, wherein the organic solvent is one or more of N-N dimethylformamide, dimethyl sulfoxide, formic acid and cyclohexanone.

4. The method for separating and purifying the blending material in the waste polyester fiber product as claimed in claim 1, wherein the dipping time is 10-30 min.

5. The method for separating and purifying the blending material in the waste polyester fiber product as claimed in claim 1, wherein the separation method comprises a nylon separation step, wherein formic acid is adopted as an organic solvent for separating nylon, the temperature is 80-110 ℃, and the soaking time is 10-20 min.

6. The method for separating and purifying the blending material in the waste polyester fiber product, according to claim 1, is characterized in that the separation method comprises a spandex separation step, wherein an organic solvent for separating spandex is one or more of N-N dimethylformamide, dimethyl sulfoxide and cyclohexanone, the temperature is 130-150 ℃, and the soaking time is 15-25 min.

7. The method for separating and removing impurities from the blended materials in the waste polyester fiber products as claimed in any one of claims 1 to 6, wherein the separation method at least comprises a step of separating spandex from nylon, the step of separating spandex from nylon is carried out in a split way, after the step of separating spandex is completed, the waste polyester fiber products are squeezed and dried, then enter a cleaning tank to be rinsed, and then are subjected to the step of separating nylon.

8. The method for separating and purifying the blending material in the waste polyester fiber product as claimed in claim 1, wherein the separation method further comprises a step of separating polylactic acid fiber and acetate fiber, wherein cyclohexanone is adopted as an organic solvent, the temperature is 130-150 ℃, and the dipping time is 15-25 min.

9. The method for separating and removing impurities from blending materials in waste polyester fiber products as claimed in claim 1, wherein the waste polyester fiber products comprise clothing scraps, curtains and carpets.

10. The method for separating and removing impurities from blending materials in waste polyester fiber products as claimed in claim 1, wherein the loosening degree of the waste polyester fiber products after opening treatment is 195-400 kg/m for cultivation.

Technical Field

The application relates to the field of recycling of waste polyester fiber products, in particular to a separation and impurity removal method for a blending material in a waste polyester fiber product.

Background

Polyethylene terephthalate (PET) is a saturated polyester formed by polymerizing terephthalic acid or dimethyl terephthalate with ethylene glycol. Because of good physical and chemical stability and tensile property, the fabric is widely applied to the fields of clothing, food packaging and the like. However, because PET has extremely strong chemical inertness under natural conditions and is difficult to biodegrade, and a large amount of waste polyester causes serious pollution to the environment, recycling waste polyester products, realizing effective recycling of resources and reducing environmental pollution become important subjects of the polyester industry.

At present, a plurality of problems still exist in recycling of waste polyester, and most obviously, materials such as nylon, spandex and the like are mixed in waste polyester raw materials. Whether melt spinning is carried out by a physical method or chain decomposition and repolymerization are carried out by a chemical method to form polyester, the quality of regenerated products of nylon and spandex contained in raw materials is influenced. Japanese emperor company utilizes ethylene glycol to chain-decompose waste polyester to obtain ethylene terephthalate (BHET), then reacts with methanol to obtain dimethyl terephthalate (DMT), and then the high-purity monomer is prepared by the technological processes of distillation, crystallization and the like, and the high-purity monomer is melt-polycondensed to prepare the fiber-grade PET. Further, for example, Japanese environmental design Co., Ltd, a high-quality bottle-grade PET chip is obtained by using ethylene glycol to chain-decompose waste polyester bottles, and performing processes such as decoloring, metal ion removal, BHET crystallization precipitation, solid-liquid separation, molecular distillation, melt polycondensation, solid phase polycondensation and the like. This method of chain scission followed by polymerization theoretically enables complete regeneration cycles, but brings about a more serious problem in that spandex, nylon, etc. are difficult to remove in the chain scission solution.

Therefore, the method for removing the nylon and the spandex in the waste polyester before the chain decomposition is another way of thinking and really meeting the good path of practical and energy-saving property.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a method for separating and removing impurities from a blending material in a waste polyester fiber product.

In order to achieve the above object, the present application adopts the following technical solutions:

a method for separating and removing impurities from a blending material in a waste polyester fiber product is characterized by comprising the following steps:

1) the used waste polyester fiber products are subjected to opening treatment through an opener;

2) selecting an organic solvent with a boiling point of 20-230 ℃, fully contacting and dipping the loosened waste polyester fiber product at a temperature of 20-180 ℃, dissolving soluble fibers except polyester, then filtering, and recovering the organic solvent from the filtrate in a distillation or fractionation mode for recycling.

Preferably, the organic solvent comprises one or more of dimethylacetamide, N-dimethylformamide, dimethyl sulfoxide, diethyl ether, xylene, N-butanol, formic acid, m-cresol, triethylene glycol, tetrahydrofuran, 1-ethyl-3-methylimidazole bromide salt, trifluoroethanol, benzenediol, o-dichlorobenzene, cyclohexanone, cyclopentanone, acetone and N-methylpyrrolidone.

Preferably, the organic solvent is one or a mixture of N-N dimethylformamide, dimethyl sulfoxide, formic acid and cyclohexanone.

Preferably, the separation method comprises a nylon separation step, wherein formic acid is adopted as an organic solvent for separating nylon, the temperature is 80-110 ℃, and the impregnation time is 10-20 min.

Preferably, the separation method comprises a spandex separation step, wherein one or more of N-N dimethylformamide, dimethyl sulfoxide and cyclohexanone are adopted as an organic solvent for separating spandex, the temperature is 130-150 ℃, and the soaking time is 15-25 min.

Preferably, the separation method at least comprises a step of separating the spandex from the nylon, wherein the step of separating the spandex from the nylon is carried out in a split mode, after the step of separating the spandex is completed, the waste polyester fiber product is squeezed to be dry and then enters a cleaning pool to be rinsed, and then the step of separating the nylon is carried out.

Preferably, the separation method further comprises a step of separating the polylactic acid fibers and the acetate fibers, wherein cyclohexanone is adopted as an organic solvent, the temperature is 130-150 ℃, and the soaking time is 15-25 min.

Preferably, the waste polyester fiber products include clothing trims, curtains and carpets.

Preferably, the loosening degree of the waste polyester fiber product after the opening treatment is 195-400 kg/m in cultivation.

Due to the adoption of the technical scheme, the nylon and spandex in the waste polyester are removed before chain decomposition by adopting an organic solvent dissolving method, the treatment method is simple and convenient, the energy loss is saved, the separation effect is good, the efficiency is high, and the method is easy to implement.

Detailed description of the invention

The present application is further described below in conjunction with the detailed description. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application. Further, it should be understood that various changes or modifications can be made to the present application by those skilled in the art after reading the teaching of the present application, and these equivalents also fall within the scope of the present application defined by the appended claims.