阅读说明：本技术 一种利用废弃口罩制备木塑复合材料的方法 (Method for preparing wood-plastic composite material by using waste mask ) 是由 虞嘉希 柏小东 赵良 于 2020-06-02 设计创作，主要内容包括：本发明涉及一种利用废弃口罩制备木塑复合材料的方法,先采用消毒剂对废弃口罩进行消毒处理,接着将消毒后的口罩进行干燥,然后切割破碎,得到口罩颗粒,然后将口罩颗粒加入到静电分离机中进行电选,然后加入到浮选机中进行浮选,得到聚丙烯颗粒,接着往聚丙烯颗粒中加入木粉和聚丙烯接枝马来酸酐,混合均匀后在开炼机中混炼,最后热压成型,冷却后即得木塑复合材料。本发明实现了对口罩的回收再利用,降低了垃圾填埋场的压力,解决了废弃医疗垃圾二次污染的问题。本发明制得的木塑材料具有优良的力学性能、抗强酸碱性能、耐水性能及耐腐蚀性能,并且使用寿命长,不繁殖细菌,不易被虫蛀、不长真菌,适合用作建筑材料、家具材料等。(The invention relates to a method for preparing a wood-plastic composite material by utilizing a waste mask, which comprises the steps of firstly adopting a disinfectant to disinfect the waste mask, then drying the disinfected mask, then cutting and crushing the dried mask to obtain mask particles, then adding the mask particles into an electrostatic separator for electric separation, then adding the mask particles into a flotation machine for flotation to obtain polypropylene particles, then adding wood powder and polypropylene grafted maleic anhydride into the polypropylene particles, mixing the mixture uniformly, then mixing the mixture in an open mill, finally carrying out hot press molding, and cooling to obtain the wood-plastic composite material. The invention realizes the recycling of the mask, reduces the pressure of a refuse landfill and solves the problem of secondary pollution of waste medical refuse. The wood-plastic material prepared by the invention has excellent mechanical property, strong acid and alkali resistance, water resistance and corrosion resistance, has long service life, does not propagate bacteria, is not easy to be damaged by worms, does not grow fungi, and is suitable for being used as building materials, furniture materials and the like.)

1. A method for preparing a wood-plastic composite material by using a waste mask is characterized by comprising the following steps:

(1) adopting a disinfectant to disinfect the waste mask to obtain a disinfected mask;

(2) drying the disinfected mask, and then cutting and crushing to obtain mask particles;

(3) adding the mask particles into an electrostatic separator for electric separation, and then adding the mask particles into a flotation machine for flotation to obtain polypropylene particles;

(4) adding wood powder and polypropylene grafted maleic anhydride into the polypropylene particles obtained in the step (3), uniformly mixing, then mixing in an open mill, finally performing hot press molding, and cooling to obtain the wood-plastic composite material;

in the step (4), the weight ratio of the wood powder to the polypropylene particles is (5-7):10, and the weight ratio of the polypropylene grafted maleic anhydride to the polypropylene particles is (0.1-0.5): 1.

2. The method for preparing a wood-plastic composite using a discarded mask as claimed in claim 1, wherein the disinfectant in the step (1) is a sodium hypochlorite solution having an effective chlorine concentration of 500mg/L to 1000 mg/L.

3. The method for preparing a wood-plastic composite material using a discarded mask as claimed in claim 1, wherein in the step (3), the operating parameters of the electrostatic separator are as follows: the power is 2.2kw, the rotating speed is 1000r/min, and the discharge particle size is 200-400 μm.

4. The method for preparing a wood-plastic composite material using a discarded mask as claimed in claim 1, wherein in the step (3), the rotation speed of an impeller of a flotation machine is 1000rpm, the aeration flow rate is 100L/h, the flotation time is 4-6min, and a preparation method of a reagent used for flotation is as follows: to a 1% by mass aqueous NaOH solution was added methyl isobutyl carbinol to a pH of 11.

5. The method for preparing a wood-plastic composite using a discarded mask as claimed in claim 1, wherein the mixing temperature is 180 ℃ and the time is 8-10min in the step (4).

6. The method for preparing a wood-plastic composite using a discarded mask as set forth in any one of claims 1 to 5, wherein the hot press molding is performed on a press vulcanizer at a hot press molding temperature of 200 ℃ in the step (4).

Technical Field

The invention relates to a recycling method of a waste mask, in particular to a method for preparing a wood-plastic composite material by using the waste mask, and belongs to the technical field of materials.

Background

Influenced by the epidemic situation of the novel coronavirus, medium and small-sized enterprises which are increasingly large add the ranks for producing the masks, the productivity of the masks is increased day by day, and the quantity of the waste masks is also continuously increased. Disposable medical gauze mask, medical surgery gauze mask, N95, KN95 gauze mask etc. all use polypropylene melt-blown fabric to process the preparation as a macromolecular polymer, and polypropylene has the stable difficult natural degradation's of chemical structure shortcoming under the normal atmospheric temperature, therefore, if do not carry out the pertinence processing to abandonment gauze mask, will cause the problem that abandonment medical supplies piles up the pollution certainly.

In the 7 th month of 2019, the "Shanghai municipal domestic waste management regulation" is formally implemented, and Beijing is going to go out of the relevant regulations in 2012, and relevant measures are taken in various places. The garbage classification is greatly promoted to realize preliminary separation for the recovery of the waste masks at the source, so that the follow-up difficulty is reduced. At present, the recovery method of the waste mask is relatively laggard, mainly comprises centralized incineration and cracking or landfill after disinfection, and has low efficiency and the problem of secondary pollution easily caused.

Disclosure of Invention

The invention aims to solve the defects of the recovery problem of the waste mask in the prior art, and provides a method for preparing a wood-plastic composite material by using the waste mask.

Technical scheme

A method for preparing a wood-plastic composite material by using a waste mask comprises the following steps:

(1) adopting a disinfectant to disinfect the waste mask to obtain a disinfected mask;

(2) drying the disinfected mask, and then cutting and crushing to obtain mask particles;

(3) adding the mask particles into an electrostatic separator for electric separation, and then adding the mask particles into a flotation machine for flotation to obtain polypropylene particles;

(4) and (4) adding wood powder and polypropylene grafted maleic anhydride into the polypropylene particles obtained in the step (3), uniformly mixing, then mixing in an open mill, finally performing hot press molding, and cooling to obtain the wood-plastic composite material.

In the step (4), the weight ratio of the wood powder to the polypropylene particles is (5-7):10, and the weight ratio of the polypropylene grafted maleic anhydride to the polypropylene particles is (0.1-0.5): 1.

Further, in the step (1), the disinfectant is sodium hypochlorite solution with the effective chlorine concentration of 500 mg/L-1000 mg/L.

Further, in the step (3), the working parameters of the electrostatic separator are as follows: the power is 2.2kw, the rotating speed is 1000r/min, and the discharge particle size is 200-400 μm.

Further, in the step (3), the impeller rotation speed of the flotation machine is 1000rpm, the aeration flow is 100L/h, the flotation time is 4-6min, and the preparation method of the reagent adopted by the flotation comprises the following steps: to a 1% by mass aqueous NaOH solution was added methyl isobutyl carbinol to a pH of 11.

Further, in the step (4), the mixing temperature is 180 ℃ and the mixing time is 8-10 min.

Further, in the step (4), hot press molding is performed on a flat vulcanizing machine, and the hot press molding temperature is 200 ℃.

The invention has the beneficial effects that: the invention provides a method for preparing a wood-plastic composite material by using a waste mask, which realizes the recycling of the mask, reduces the pressure of a refuse landfill and solves the problem of secondary pollution of waste medical waste. The wood-plastic material and the product thereof prepared by the invention have excellent mechanical property, strong acid and alkali resistance, water resistance and corrosion resistance, have long service life (more than 50 years), do not propagate bacteria, are not easy to be damaged by worms and do not grow fungi, can be prepared into any shape and size according to requirements, are suitable for being used as building materials, furniture materials and the like, and have wide market prospect and economic benefit.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples, in which the model of the electrostatic separator is 1800 type, and the model of the flotation machine is BS-K type, but not limited thereto.