阅读说明：本技术 一种从包裹碳化硅的聚氨酯中提取碳化硅的制备方法 (Preparation method for extracting silicon carbide from polyurethane wrapped with silicon carbide ) 是由 刘骏 蔡璐 刘波 王钢 汪国雄 张海波 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种从包裹碳化硅的聚氨酯中提取碳化硅的制备方法,具体包括以下步骤：S1、原料的称量,S2、废料的破碎处理,S3、加热超声溶解,S4、清洗过滤处理,S5、碳化硅的精制,涉及化工技术领域。该从包裹碳化硅的聚氨酯中提取碳化硅的制备方法,可实现通过采用充分破碎、采用充分加热搅拌以及采用强化溶解剂的方法,来使碳化硅表面的聚氨酯进行快速溶解,很好的达到了既快速又高效的完成聚氨酯材料溶解的目的,大大提升了溶解效果,缩短了溶解时间,无需花费生产人员大量的时间来进行溶解等待,大大提高了碳化硅生产回收的效率,减轻了生产人员的工作负担,从而大大方便了生产人员的碳化硅回收生产工作。(The invention discloses a preparation method for extracting silicon carbide from polyurethane wrapped with silicon carbide, which specifically comprises the following steps: s1, weighing raw materials, S2, crushing waste materials, S3, heating, ultrasonic dissolving, S4, cleaning, filtering, and refining S5 and silicon carbide, and relates to the technical field of chemical industry. This preparation method of silicon carbide is drawed from polyurethane of parcel silicon carbide, can realize through adopting abundant breakage, adopt the method of abundant heating stirring and adopting the enhanced dissolving agent, make the polyurethane on silicon carbide surface dissolve fast, fine reaching not only quick but also the efficient purpose that the completion polyurethane material dissolved, the dissolution effect has been promoted greatly, the dissolution time has been shortened, need not to spend a large amount of time of producers to dissolve the waiting, the efficiency of silicon carbide production recovery has been improved greatly, producer's work burden has been lightened, thereby the silicon carbide recovery production work of producers has been made things convenient for greatly.)

1. A preparation method for extracting silicon carbide from polyurethane coated with silicon carbide is characterized by comprising the following steps: the method specifically comprises the following steps:

s1, weighing raw materials: firstly, respectively weighing 50-100g of polyurethane waste containing silicon carbide, 12-20mL of dissolving agent, 5-10mL of alkali solution and 3-5mL of acid solution by using weighing equipment;

s2, crushing the waste: pouring the polyurethane waste material containing silicon carbide weighed in the step S1 into crushing equipment, cutting large polyurethane waste materials into small waste materials through a cutter, crushing the small waste materials into granular waste materials through a roll shaft, and screening through a screen of 20-60 meshes to obtain granular waste materials;

s3, heating and ultrasonic dissolving: pouring the dissolving agent measured in the step S1 into a dissolving tank, transferring the waste particles screened in the step S2 into the dissolving tank, starting heating equipment, heating the temperature of the dissolving agent in the heating tank to 36-52 ℃, and simultaneously starting ultrasonic oscillation equipment to uniformly dissolve the waste particles in the dissolving tank for 1-2 hours;

s4, cleaning and filtering: when the size of the solid matter dissolved in the step S3 is not obviously changed, pouring the precipitate and the solution in the dissolving tank into filtering equipment to filter out the precipitate, then cleaning the precipitate for 2 to 3 times by using clear water, filtering and separating the cleaned mixed solution by using the filtering equipment again, and then collecting filter residues to obtain a crude product of silicon carbide;

s5, refining of silicon carbide: and (3) placing the crude silicon carbide product obtained in the step (S4) in the alkali solution measured in the step (S1), stirring for 15-20min by using an electromagnetic oscillation stirring device, filtering by using a filtering device, transferring the filter residue to the acid solution measured in the step (S1), continuously stirring for 25-30min by using the electromagnetic oscillation stirring device, filtering by using the filtering device again after the acid is dissolved, and washing for 5-8min by using clear water at the same time to obtain a refined silicon carbide product.

2. The method for preparing silicon carbide extracted from polyurethane coated with silicon carbide according to claim 1, wherein the method comprises the following steps: the dissolving agent in the step S1 is prepared by mixing 0.5-1.5mL of toluene, 3-8mL of butanone, 0.8-2.3mL of dimethylformamide and 1.8-3.8mL of tetrahydrofluoroamine.

3. The method for preparing silicon carbide extracted from polyurethane coated with silicon carbide according to claim 1, wherein the method comprises the following steps: the alkali solution in step S1 is one of sodium hydroxide solution, potassium hydroxide, or ammonium hydroxide.

4. The method for preparing silicon carbide extracted from polyurethane coated with silicon carbide according to claim 1, wherein the method comprises the following steps: the acid solution in the step S1 is one of hydrochloric acid or nitric acid.

5. The method for preparing silicon carbide extracted from polyurethane coated with silicon carbide according to claim 1, wherein the method comprises the following steps: the crushing equipment in the step S2 is a double-filtering cutting and crushing integrated machine.

6. The method for preparing silicon carbide extracted from polyurethane coated with silicon carbide according to claim 1, wherein the method comprises the following steps: in the step S3, the ultrasonic oscillation device is a programmable ultrasonic agitator with a model number of JH1500W 20.

Technical Field

The invention relates to the technical field of chemical industry, in particular to a preparation method for extracting silicon carbide from polyurethane wrapped with silicon carbide.

Background

Silicon carbide is also known as: carbo-silica, corundum, or refractory sand, chemical formula: SiC is a refractory material which is formed by high-temperature smelting of quartz sand, petroleum coke (or coal coke) and wood chips serving as raw materials through a resistance furnace, silicon carbide exists in rare minerals and Mosang stone in nature, and is the most widely and economically applied silicon carbide in modern C, N, B and other non-oxide high-technology refractory raw materials, the silicon carbide produced in industry in China is divided into black silicon carbide and green silicon carbide which are both hexagonal crystals and have the specific gravity of 3.20-3.25, and the silicon carbide has stable chemical properties, high thermal conductivity, small thermal expansion coefficient and good wear resistance and has other purposes besides being used as an abrasive.

Polyurethanes are a general term for macromolecular compounds containing repeating urethane groups in the main chain. It is prepared by the polyaddition of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compound, and the polyurethane macromolecule may contain ether, ester, urea, biuret, allophanate and other groups besides carbamate. The polyurethane material has wide application, and along with the increasingly wide application of polyurethane, silicon carbide needs to be added into the polyurethane material to improve the heat conduction, wear resistance and chemical properties of the polyurethane material, so that a large amount of polyurethane waste containing silicon carbide can be generated, and the silicon carbide in the waste needs to be recovered to achieve the purposes of energy conservation and environmental protection.

At present in the process of extracting silicon carbide in polyurethane waste, most of the polyurethane coated on the outer surface of the silicon carbide is directly dissolved, and then refined product treatment is carried out, however, the existing method for dissolving the polyurethane has poor dissolving effect and long dissolving time, and a large amount of time is needed for production personnel to dissolve and wait, so that the efficiency of silicon carbide production and recovery is greatly reduced, the workload of production personnel is increased, the method for combining physical chemistry and chemical can not be realized, the polyurethane on the surface of the silicon carbide is rapidly dissolved, and the purpose of rapidly and efficiently completing the dissolution of the polyurethane material can not be achieved, thereby bringing great inconvenience to the silicon carbide recovery production work of the production personnel.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a preparation method for extracting silicon carbide from polyurethane wrapped with silicon carbide, and solves the problems that the existing method for dissolving the polyurethane has poor dissolving effect and long dissolving time, and needs a great amount of time for production personnel to dissolve and wait, thereby greatly reducing the efficiency of producing and recycling the silicon carbide, increasing the workload of the production personnel, and being incapable of realizing the rapid dissolution of the polyurethane on the surface of the silicon carbide by a method combining physical chemistry and failing to achieve the purpose of rapidly and efficiently dissolving the polyurethane material.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a preparation method for extracting silicon carbide from polyurethane coated with silicon carbide specifically comprises the following steps:

s1, weighing raw materials: firstly, respectively weighing 50-100g of polyurethane waste containing silicon carbide, 12-20mL of dissolving agent, 5-10mL of alkali solution and 3-5mL of acid solution by using weighing equipment;

s2, crushing the waste: pouring the polyurethane waste material containing silicon carbide weighed in the step S1 into crushing equipment, cutting large polyurethane waste materials into small waste materials through a cutter, crushing the small waste materials into granular waste materials through a roll shaft, and screening through a screen of 20-60 meshes to obtain granular waste materials;

s3, heating and ultrasonic dissolving: pouring the dissolving agent measured in the step S1 into a dissolving tank, transferring the waste particles screened in the step S2 into the dissolving tank, starting heating equipment, heating the temperature of the dissolving agent in the heating tank to 36-52 ℃, and simultaneously starting ultrasonic oscillation equipment to uniformly dissolve the waste particles in the dissolving tank for 1-2 hours;

s4, cleaning and filtering: when the size of the solid matter dissolved in the step S3 is not obviously changed, pouring the precipitate and the solution in the dissolving tank into filtering equipment to filter out the precipitate, then cleaning the precipitate for 2 to 3 times by using clear water, filtering and separating the cleaned mixed solution by using the filtering equipment again, and then collecting filter residues to obtain a crude product of silicon carbide;

s5, refining of silicon carbide: and (3) placing the crude silicon carbide product obtained in the step (S4) in the alkali solution measured in the step (S1), stirring for 15-20min by using an electromagnetic oscillation stirring device, filtering by using a filtering device, transferring the filter residue to the acid solution measured in the step (S1), continuously stirring for 25-30min by using the electromagnetic oscillation stirring device, filtering by using the filtering device again after the acid is dissolved, and washing for 5-8min by using clear water at the same time to obtain a refined silicon carbide product.

Preferably, the dissolving agent in step S1 is a mixture of 0.5-1.5mL of toluene, 3-8mL of butanone, 0.8-2.3mL of dimethylformamide, and 1.8-3.8mL of tetrahydrofluoroamine.

Preferably, the alkali solution in step S1 is one of sodium hydroxide solution, potassium hydroxide or ammonium hydroxide.

Preferably, the acid solution in step S1 is one of hydrochloric acid or nitric acid.

Preferably, the crushing device in the step S2 is a double-filtering cutting and crushing all-in-one machine.

Preferably, in the step S3, the ultrasonic oscillation device is a programmable ultrasonic agitator with a model number of JH1500W 20.

(III) advantageous effects

The invention provides a preparation method for extracting silicon carbide from polyurethane wrapped with silicon carbide. The method has the following beneficial effects: the preparation method for extracting silicon carbide from polyurethane coated with silicon carbide specifically comprises the following steps: s1, weighing raw materials: firstly, respectively measuring 50-100g of polyurethane waste containing silicon carbide, 12-20mL of dissolving agent, 5-10mL of alkali solution and 3-5mL of acid solution by using weighing equipment, S2, and crushing the waste: pouring the polyurethane waste material containing silicon carbide weighed in the step S1 into crushing equipment, cutting large polyurethane waste material into small waste material through a cutter, crushing the small waste material into granular waste material through a roller shaft, and screening through a screen of 20-60 meshes to obtain granular waste material, S3, heating and ultrasonically dissolving: pouring the dissolving agent measured in the step S1 into a dissolving tank, transferring the waste particles screened in the step S2 into the dissolving tank, starting heating equipment, heating the temperature of the dissolving agent in the heating tank to 36-52 ℃, starting ultrasonic oscillation equipment at the same time, uniformly dissolving the waste particles in the dissolving tank for 1-2h, and S4, cleaning and filtering: when the size of the solid matter dissolved in the step S3 has no obvious change, pouring the precipitate and the solution in the dissolving tank into a filtering device to filter out the precipitate, then cleaning the precipitate for 2-3 times with clear water, filtering and separating the cleaned mixed solution again through the filtering device, and then collecting the filter residue to obtain a crude silicon carbide product, S5, refining the silicon carbide: placing the crude silicon carbide product obtained in the step S4 in the aqueous alkali measured in the step S1, stirring for 15-20min by an electromagnetic oscillation stirring device, filtering by a filtering device, transferring filter residues to the acid solution measured in the step S1, continuously stirring for 25-30min by the electromagnetic oscillation stirring device, filtering by the filtering device again after the acid dissolution is finished, and washing for 5-8min by clear water to obtain a refined silicon carbide product, wherein the method of fully crushing, fully heating and stirring and reinforcing a dissolving agent is adopted to quickly dissolve polyurethane on the surface of silicon carbide, so that the aim of quickly and efficiently completing the dissolution of the polyurethane material is well fulfilled, the dissolving effect is greatly improved, the dissolving time is shortened, and a large amount of time is not needed for production personnel to perform dissolving waiting, the efficiency of carborundum production recovery has been improved greatly, has alleviateed producers' work burden to the carborundum recovery production work of producer has been made things convenient for greatly.

Drawings

FIG. 1 is a flow chart of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the embodiment of the present invention provides three technical solutions: a preparation method for extracting silicon carbide from polyurethane coated with silicon carbide specifically comprises the following steps: