阅读说明：本技术 一种废旧口罩再生阻燃塑胶弹性体的制备方法 (Preparation method of regenerated flame-retardant plastic elastomer of waste mask ) 是由 邓素荣 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种废旧口罩再生阻燃塑胶弹性体的制备方法,本发明属于高分子材料技术领域,制备的再生阻燃塑胶弹性体对环境无污染,生产成本降低,生产效率高,抗撕裂能力较强,在许多恶劣的外力撕裂环境下都能够保持良好的产品完整性,恢复能力较好,与其他弹性体材料相比,抗撕裂能力非常优越,持久耐磨,抗老化,高弹力,拉伸性强,相较于目前的废旧口罩焚烧处理,不仅提升了其巨大的经济价值,保证废旧口罩得到无害化处理的同时,还减少了环境污染,缓解了聚丙烯等高分子原料的短缺,绿色环保,资源再生,为解决大规模废旧一次性医用口罩,提供了一条高经济价值环保无害的处理方法,具有广泛的应用前景。(The invention discloses a preparation method of a waste mask regenerated flame-retardant plastic elastomer, which belongs to the technical field of high polymer materials, the prepared regenerated flame-retardant plastic elastomer has no pollution to the environment, the production cost is reduced, the production efficiency is high, the tear resistance is strong, the product integrity can be kept under a plurality of severe external force tearing environments, the recovery capability is good, compared with other elastomer materials, the tear resistance is very superior, the product is durable, wear-resistant, ageing-resistant, high in elasticity and strong in stretchability, compared with the existing waste mask incineration treatment, the huge economic value is improved, the waste mask is ensured to be subjected to harmless treatment, the environmental pollution is reduced, the shortage of high polymer raw materials such as polypropylene is relieved, the environment is protected, the resources are regenerated, and a high-economic-value, environment-friendly and harmless treatment method is provided for solving the large-scale disposable medical mask, has wide application prospect.)

1. A preparation method of a regenerated flame-retardant plastic elastomer of a waste mask is characterized by comprising the following steps:

modifying the waste mask: the waste mask is a waste disposable medical mask which is arranged in a polyethylene packaging bag and is enclosed in a room with negative pressure of-5 to-10 Pa relative to the outside, an elastic ear band is attached to the waste disposable medical mask, the waste disposable medical mask is made of polypropylene non-woven fabrics, the waste mask and the polyethylene packaging bag or the waste mask are sent into a crusher to be crushed fully, ethanol with the mass fraction of 80% is used for soaking, stirring and washing for 5 to 10 hours, obtaining a solid-liquid mixture, taking waste mask fragments, filtering to remove ethanol, boiling the ethanol for recycling, transferring the ethanol into a 0.02-0.05% surfactant solution, soaking for active treatment for 5-6 h, filtering, transferring the ethanol into clear water, heating to 50-70 KPa, boiling in water for 0.5-1 h, cooling to room temperature, standing for 5-10 h, removing high-density water bottom impurities, filtering at 70-80 ℃, and drying for 4-5 h to obtain clean waste mask fragments; (2) the clean waste mask fragments obtained in the step (1) are filtered by using irradiance of 0.89W/m, lamp distance of 1-15 cm and wavelength of 340 nm; after the ultraviolet lamp irradiates for 4-8 hours at the temperature of 60-70 ℃, the ozone concentration is 10-100 pphm air flow velocity: 12-16 mm/s, gas flow: aging the mixture in a processor of 20-40L/min at 50-60 ℃ and humidity of 60-80% for 0.1-0.5 h to obtain a flame-retardant plastic elastomer raw material; (3) modifying the raw materials of the flame-retardant plastic elastomer by using a compatilizer, a flexibilizer and a thickening agent to obtain modified recycled plastic; (4) stirring all the ingredients at 105-115 ℃ for 100-120 minutes at a stirring speed of 500-600 r/min to uniformly mix the ingredients; and melting, plasticizing and granulating in a double-screw extruder to obtain the regenerated plastic granules.

2. The method for preparing the regenerated flame-retardant plastic elastomer of the waste mask as claimed in claim 1, wherein the elastic ear band attached to the waste disposable medical mask filled in the polyethylene packaging bag is one of ethylene propylene rubber, SBS and SEBS materials.

3. The method for preparing the regenerated flame-retardant plastic elastomer with the waste mask as claimed in claim 1, wherein the compatilizer is one or a mixture of SEBS-g-MAH, POE-g-GMA and ethylene-ethyl acrylate copolymer; the toughening agent is talcum powder and/or sericite powder; the specific material components of the thickening agent are as follows in parts by weight: 3-5 parts of ammonium pyrophosphate, 4-6 parts of dimelamine pyrophosphate, 1-3 parts of tetramethyl thiuram disulfide and 2-4 parts of dioctyl sodium sulfosuccinate.

4. The method for preparing the regenerated flame-retardant plastic elastomer with the waste mask according to claim 1, wherein the temperatures of the first zone, the second zone, the third zone and the eighth zone of the extruder in the step (4) are respectively 170 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃, 210 ℃ and the screw rotation speed is 100-120 r/min.

5. The method for preparing the regenerated flame-retardant plastic elastomer with the waste respirator according to claim 1, wherein the specific modification process comprises the steps of adding a compatilizer, a flexibilizer and a thickening agent into the raw materials of the flame-retardant plastic elastomer, and then mixing the raw materials in a continuous mixing roll for 15-30 minutes; the mass of the compatilizer, the mass of the flexibilizer and the mass of the thickening agent are respectively 3.2-4.4%, 1.5-2.2% and 8.2-10.5% of the mass of the recycled plastic.

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a preparation method of a regenerated flame-retardant plastic elastomer for a waste mask.

Background

At present, the medical mask in China with the largest use amount is a disposable medical mask of a common grade. The disposable mask has low cost, and the raw material is mainly polypropylene. The polypropylene high-melting-point non-woven fabric special material becomes the best choice, the non-woven fabric mask is formed by two layers of fiber non-woven fabrics which are professionally used for medical care and health, more than 99.99 percent of filtering and bacterium prevention of one layer is added in the middle of the non-woven fabric mask, the non-woven fabric mask is formed by ultrasonic welding, when the mask demand is large, the influence on the market is extremely severe, multiple enterprises can increase horsepower to produce polypropylene raw materials, in the face of severe demand situation, technical personnel in the field need to develop a preparation method for regenerating the flame-retardant plastic elastomer by the waste mask urgently, the existing technical dilemma is solved, the safe, pollution-free and environment-friendly recycling of the waste mask is realized, and the contribution power.

Disclosure of Invention

The invention aims to provide a preparation method of a regenerated flame-retardant plastic elastomer of a waste mask, aiming at the existing problems.

A preparation method of a regenerated flame-retardant plastic elastomer for a waste mask comprises the following steps:

(1) modifying the waste mask: the waste mask is a waste disposable medical mask which is arranged in a polyethylene packaging bag and is enclosed in a room with negative pressure of-5 to-10 Pa relative to the outside, an elastic ear band is attached to the waste disposable medical mask, the waste disposable medical mask is made of polypropylene non-woven fabrics, the waste mask and the polyethylene packaging bag or the waste mask are sent into a crusher to be crushed fully, ethanol with the mass fraction of 80% is used for soaking, stirring and washing for 5 to 10 hours, obtaining a solid-liquid mixture, taking waste mask fragments, filtering to remove ethanol, boiling the ethanol for recycling, transferring the ethanol into a 0.02-0.05% surfactant solution, soaking for active treatment for 5-6 h, filtering, transferring the ethanol into clear water, heating to 50-70 KPa, boiling in water for 0.5-1 h, cooling to room temperature, standing for 5-10 h, removing high-density water bottom impurities, filtering at 70-80 ℃, and drying for 4-5 h to obtain clean waste mask fragments; (2) the clean waste mask fragments obtained in the step (1) are filtered by using irradiance of 0.89W/m, lamp distance of 1-15 cm and wavelength of 340 nm; after the ultraviolet lamp irradiates for 4-8 hours at the temperature of 60-70 ℃, the ozone concentration is 10-100 pphm air flow velocity: 12-16 mm/s, gas flow: aging the mixture in a processor of 20-40L/min at 50-60 ℃ and humidity of 60-80% for 0.1-0.5 h to obtain a flame-retardant plastic elastomer raw material; (3) modifying the raw materials of the flame-retardant plastic elastomer by using a compatilizer, a flexibilizer and a thickening agent to obtain modified recycled plastic; the specific modification process comprises the steps of adding the raw materials of the flame-retardant plastic elastomer into a compatilizer, a flexibilizer and a thickening agent, and then mixing for 15-30 minutes in a continuous mixing roll; the mass of the compatilizer, the mass of the flexibilizer and the mass of the thickening agent are respectively 3.2-4.4%, 1.5-2.2% and 8.2-10.5% of the mass of the recycled plastic; (4) stirring all the ingredients at 105-115 ℃ for 100-120 minutes at a stirring speed of 500-600 r/min to uniformly mix the ingredients; and (3) melting, plasticizing and granulating in a double-screw extruder, wherein the temperatures of the first zone to the eighth zone and the machine head of the extruder are respectively 170 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃ and 210 ℃, the temperature of the machine head is 210 ℃, and the rotating speed of a screw is 100-120 r/min, so as to obtain the regenerated plastic granules.

In a further scheme, the elastic ear bands attached to the waste disposable medical mask filled in the polyethylene packaging bag are made of one of ethylene propylene rubber, SBS and SEBS materials.

In a further scheme, the compatilizer is one or a mixture of SEBS-g-MAH, POE-g-GMA and ethylene-ethyl acrylate copolymer; the toughening agent is talcum powder and/or sericite powder; the specific material components of the thickening agent are as follows in parts by weight: 3-5 parts of ammonium pyrophosphate, 4-6 parts of dimelamine pyrophosphate, 1-3 parts of tetramethyl thiuram disulfide and 2-4 parts of dioctyl sodium sulfosuccinate.

The waste mask in the application is a defective mask produced in the production process.

The invention has the beneficial effects that:

the regenerated plastic elastomer prepared by the preparation method of the invention is generally of a three-layer non-woven fabric structure for a common medical mask, and is formed by ultrasonic welding of a solution-jet non-woven fabric knot which is formed by two layers of spun-bonded non-woven fabrics specially used for medical treatment and health and is provided with a layer of filtration antibacterial fabric added in the middle and filtered by more than 99.999 percent. Polypropylene nonwoven fabrics are relatively woven fabrics, i.e., nonwoven fabrics, and are composed of fibers. The advantages are air permeability, filterability, water absorption, waterproofness, good hand feeling, softness and lightness, but also has the defect that the hand washing cannot be carried out. The thickening agent can play a role in flame retardance, and is mainly used for improving the processing performance of the polymer and playing a role in blocking in a combustion process. On the other hand, in the heating process, surface adsorbed water and interlayer bound water can be released, the surface temperature of the polymer base material and the concentration of combustible gas can be reduced, and the combustion speed of the plastic elastomer is delayed. More importantly, the solid acid generated after decomposition of ammonium pyrophosphate and dimelamine pyrophosphate can promote the decomposition product of the polymer to form carbon, and the solid acid can play a role in fixing and enhancing the formed carbon layer, so that the carbon layer is not easy to crack in the combustion process, and finally plays a role in protecting the polymer, thereby improving the flame retardant property of the polymer. Sericite powder is another layered material, which can inhibit pyrolysis and burning of the polymer to some extent. The dioctyl sodium sulfosuccinate, the ammonium pyrophosphate, the dimelamine pyrophosphate and the tetramethyl thiuram disulfide in the thickening agent are solid powder, can adsorb resin in a molten state, reduce the melt index of master batches, have good compatibility with polypropylene, can be fully dispersed in a resin matrix when a polymer is molten, and improve the tensile strength and the impact strength of the plastic elastomer. Meanwhile, the appearance of the product is not influenced, and the recycling of the waste mask is not influenced.

Compared with the prior art, the invention has the following advantages:

the preparation method disclosed by the invention does not need to separate the waste mask from the polyethylene package, does not violate the original purpose of using the polyethylene package bag to isolate the waste mask to ensure sanitation, avoids the problems of secondary cross infection germs and the like caused by manual separation, is simple, convenient and easy to implement, saves labor cost, enables the polyethylene package bag to be directly used as a raw material to be blended and processed with polypropylene non-woven fabrics, reduces the manufacturing cost of the regenerated plastic elastomer, is different from the ink guard rule of the separation and processing of different types of plastic raw materials in the common plastic processing principle, also takes the elastic ear bag as a raw material to be directly blended and processed to play the same role, can be used as a toughening elastic system of the plastic elastomer, and can be used for further processing all the waste masks without separation and labor saving, and the processing steps ensure that the raw materials of the regenerated plastic elastomer of the waste masks are clean, safe. Compared with the existing waste mask incineration treatment, the method has the advantages that the huge economic value is improved, the waste mask is subjected to harmless treatment, meanwhile, the environmental pollution is reduced, the shortage of high polymer raw materials such as polypropylene is relieved, the environment is protected, the resource regeneration is realized, a high-economic-value environment-friendly and harmless treatment method is provided for solving the problem of large-scale waste disposable medical masks, and the application prospect is wide.

Detailed Description

The invention is illustrated by the following specific examples, which are not intended to be limiting.