Composite material capable of releasing negative oxygen ions and preparation method therefor

Abstract

In the present invention, a combined negative ion powder is prepared by doping tourmaline with cerium and cobalt ions and loading same with titanium dioxide, wherein cerium and cobalt ions and titanium dioxide can synergistically promote negative oxygen ion release of tourmaline. Titanium dioxide and cerium and cobalt ions have special photocatalysis and electron transport properties, and can enhance the negative oxygen ion release effect of tourmaline by means of different mechanisms. Moreover, a protective layer formed by the two can effectively reduce the adsorption capacity of tourmaline with regard to pollutants in the air, and play a role in purification, such that the service life of tourmaline is prolonged. A composite material capable of releasing negative oxygen ions is obtained by adding the prepared combined negative ion powder to a polypropylene composite material, and the obtained composite material has the advantages of safety, no toxicity, a large amount of released negative ions and long service life.

Description

A composite material capable of releasing negative oxygen ions and a preparation method thereof Technical Field

[0001] The present invention relates to the technical field of composite materials, in particular to a composite material capable of releasing negative oxygen ions and a preparation method thereof. Background Art

[0002] Negative oxygen ions in the air are called "vitamins in the air". They can neutralize the active oxygen free radicals in the human body and the positive charge on the cell membrane, thus improving the human nervous system, cardiovascular system and respiratory system. Studies have found that when the negative ion content is less than 100 / cm 3 When the negative ion content is higher than 400-1000 / cm 3 It helps to improve the body's condition. The content is generally at the level of the park. When the negative ion content is 1000-5000 / cm 3 It helps to enhance human immunity and antibacterial effect. The content is about the level of rural fields. When the negative ion content is 5000-10000 / cm 3 When the negative oxygen ion concentration is high, it has antibacterial and disease-reducing effects. The concentration is about the same as that in high mountains or at the seaside. Therefore, the application technology of negative oxygen ions has been continuously developed.

[0003] In recent years, cars have become increasingly common in households, bringing great convenience to people. However, when automotive polymer materials are used as automotive interior components, they continuously release volatile organic compounds (VOCs) such as "pentaphenyltrialdehyde," which deteriorates the interior environment and harms human health. Therefore, the development of polypropylene composite materials with sustainable negative ion release for automotive interior components is of great significance and application value for improving the air quality inside the car and enhancing the oxygen health of the human body inside the car.

[0004] Patent CN106750906, a polypropylene composite material with the function of releasing negative ions and its preparation method, its static surface negative ion elimination can reach up to 780J / cm 3 , which is not an ideal value.

[0005] Patent CN106496794 discloses a method for preparing negative ion plastic interior parts with the function of purifying the air inside the car. Although the negative ion release amount is good, due to the large number of additives, they are easy to migrate to the plastic surface over time, blocking the ionization channel of negative oxygen ions, and the release of negative oxygen ions at other times cannot be guaranteed.

[0006] Patent CN108164832A discloses a polypropylene composite material with the function of releasing negative ions, its preparation method and application, and the initial negative oxygen ion content exceeds 1500J / cm3 However, it does not explain how the amount of negative oxygen ions released over time, nor does it show what specific functional additives or combinations are added to ensure the sustainable release of negative oxygen ions.

[0007] Summary of the Invention

[0008] In view of the defects of the prior art, the present invention discloses a composite material capable of releasing negative oxygen ions and a preparation method thereof.

[0009] The specific technical solutions of the present invention are as follows:

[0010] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 20-30 parts of homopolypropylene, 30-45 parts of copolymer polypropylene, 10-20 parts of combined negative ion powder, 5-10 parts of functional filler, 10-15 parts of talc, 3-5 parts of compatibilizer, 0.2-0.5 part of coupling agent, and 1-2 parts of auxiliary agent.

[0011] The melt index MI of the homopolypropylene is 9-30 g / 10 min.

[0012] The copolymerized polypropylene has a melt index of 10-30 g / 10 min.

[0013] The preparation method of the combined negative ion powder comprises the following steps:

[0014] N1, by mass, 1.4-1.5 parts of cerium nitrate, 0.9-1 parts of cobalt nitrate, and 20-30 parts of water are mixed and stirred to obtain a cerium-cobalt ion solution; 1.6-1.7 parts of citric acid and 5-10 parts of water are mixed and stirred to obtain a citric acid solution;

[0015] N2, by mass, to 20-30 parts of the cerium cobalt ion solution prepared in step N1, add 3-4 parts of tourmaline powder and 5-10 parts of citric acid solution, stir for 30-40 minutes, then place at 70-80°C and continue stirring for 2-4 hours, finally place at 85-90°C and stand for 1-2 hours, dry and calcine at 700-800°C for 5-6 hours, use a planetary ball mill for grinding, ball milling at 500 rpm for 1-2 hours, during this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes, the grinding solvent is ethanol, and after drying, a cerium cobalt tourmaline composite material is obtained;

[0016] N3, by mass, adding 2-4 parts of n-butyl titanate to 28-31 parts of anhydrous ethanol, then adding 1-3 parts of polyvinyl pyrrolidone, after ultrasonic dispersion, adding 3-4 parts of the cerium cobalt tourmaline composite material obtained in step N2, stirring for 30-60 minutes, and then standing and aging for 8-12 hours to obtain a transparent gel. The obtained transparent gel is calcined at 450-550°C for 2-4 hours, and ground using a planetary ball mill at 500 rpm for 1-2 hours. During this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent is ethanol. After drying, the combined negative ion powder is obtained.

[0017] The functional filler refers to a filler with a microporous layered channel structure, including but not limited to talc, oyster powder, nano-scale calcium hydroxide, diatomaceous earth, expanded graphite, etc.

[0018] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0019] (1) 20-30 parts of homopolypropylene and 30-45 parts of copolymerized polypropylene are put into a kneader, 10-20 parts of combined anion powder, 5-10 parts of functional filler, 10-15 parts of talcum powder, 3-5 parts of compatibilizer, 0.2-0.5 parts of coupling agent and 1-2 parts of auxiliary agent are mixed uniformly to prepare a mixed powder auxiliary agent, which is uniformly and continuously added into the kneader, and the rotation speed and temperature are controlled to knead and mix to obtain a blank;

[0020] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0021] The kneader rotates at a speed of 12-18 r / min, and after adding the mixed powder additive, the temperature is raised to 190-220° C. and kneaded for 15-30 minutes.

[0022] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, controls the gas injection amount to 0.5-1.5%, controls the injection molding machine head temperature to 190-220° C., the injection pressure to 55-85 MPa, the injection rate to 60-90 mm / s, and cools the mold to 24-26° C.

[0023] Beneficial effects of the present invention:

[0024] The present invention uses cerium-cobalt ions doped with tourmaline and loaded with titanium dioxide. Titanium dioxide, as a semiconductor material, absorbs energy under light, stimulates electron transitions, and promotes the generation and release of negative oxygen ions. Furthermore, the cerium-cobalt ions, with their unique electronic structure and chemical activity, alter the electronic energy level structure of tourmaline through the doping effect, thereby promoting electron excitation and migration, further increasing the generation and release of negative oxygen ions.

[0025] The advantage of adding titanium dioxide and cerium cobalt ions together lies in their interaction and synergistic effect. Titanium dioxide absorbs light energy and transfers it to cerium cobalt ions, further stimulating electrons in tourmaline and increasing the production of negative oxygen ions. The addition of cerium cobalt ions can modulate tourmaline's electronic structure and surface activity, providing more active sites and reaction centers, which helps enhance the release of negative oxygen ions. The two can synergistically promote the release of negative oxygen ions from tourmaline. Both titanium dioxide and cerium cobalt ions possess unique photocatalytic and electron transport properties, which can enhance tourmaline's negative oxygen ion release through different mechanisms.

[0026] On the other hand, the protective layer formed by the two can effectively reduce the tourmaline's ability to adsorb pollutants in the air and play a purifying role, thereby extending the service life of the tourmaline. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1: SEM image of combined negative ion powder;

[0028] Figure 2: "Time-temperature equivalence" model of negative ion release of the composite material capable of releasing negative oxygen ions prepared in Example 3. DETAILED DESCRIPTION

[0029] In the present invention, unless otherwise specified, all equipment and raw materials can be purchased from the market or are commonly used in the industry. The methods in the following embodiments, unless otherwise specified, are all conventional methods in the art.

[0030] The homopolypropylene is PP material 1215c.

[0031] The copolymerized polypropylene is PP material 7885.

[0032] Talc powder, model: H-1250, specification: 1225 mesh, Shijiazhuang Daheng Mineral Products Processing Co., Ltd.

[0033] Tourmaline powder, specification: 1225 mesh, components: 41.03wt% SiO2, 30.65wt% Al2O3, 4.85wt% Fe2O3, 7.23wt% B2O3, 8.62wt% FeO, 2.32wt% MgO, 0.25TiO2, 0.12wt% CaO, 1.23wt% Na2O, 1.89wt% K2O.

[0034] Expanded graphite, product number: JK-R1009, Shanghai Jingkang Biological Co., Ltd.

[0035] The compatibilizer is PP compatibilizer, item number: 5541254, purchased from Dongguan Shenghao Plastic Raw Materials Co., Ltd.

[0036] The coupling agent is 3-aminopropyltrimethoxysilane, CAS number: 13822-56-5.

[0037] Example 1

[0038] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 25 parts of homopolypropylene, 35 parts of copolymer polypropylene, 15 parts of combined negative ion powder, 5 parts of functional filler, 14 parts of talc, 4 parts of compatibilizer, 0.3 parts of coupling agent, and 1.7 parts of auxiliary agent.

[0039] The preparation method of the combined negative ion powder comprises the following steps:

[0040] N1, by mass, 1.47 parts of cerium nitrate, 0.96 parts of cobalt nitrate, and 26 parts of water were mixed and stirred to obtain a cerium-cobalt ion solution; 1.64 parts of citric acid and 6 parts of water were mixed and stirred to obtain a citric acid solution;

[0041] N2, by mass, to 26 parts of the cerium cobalt ion solution obtained in step N1, 3.5 parts of tourmaline powder and 6 parts of citric acid solution were added, stirred for 30 minutes, then placed at 75°C and continued to stir for 3 hours, finally placed at 90°C and allowed to stand for 2 hours, dried and calcined at 800°C for 5 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill continued to operate for 20 minutes and stopped for 5 minutes. The grinding solvent was ethanol, and the combined negative ion powder was obtained after drying.

[0042] The functional filler is expanded graphite.

[0043] The auxiliary agent is prepared by mixing toughening agent S-2030 and zinc stearate in a mass ratio of 1:1.

[0044] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0045] (1) 25 parts of homopolypropylene and 35 parts of copolymerized polypropylene are put into a kneader, 15 parts of combined anion powder, 5 parts of functional fillers, 14 parts of talcum powder, 4 parts of compatibilizers, 0.3 parts of coupling agents and 1.7 parts of auxiliary agents are mixed to form a mixed powder auxiliary agent, which is uniformly and continuously added to the kneader, and the speed and temperature are controlled to knead and mix to obtain a stock;

[0046] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0047] The kneader rotates at a speed of 16 r / min, and after adding the mixed powder additive, the temperature is raised to 200° C. and kneaded for 20 minutes.

[0048] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, and controls the gas injection amount to 1%; controls the injection molding machine head temperature to 200°C, the injection pressure to 65MPa, the injection rate to 75mm / s, and cools to 25°C while standing.

[0049] Example 2

[0050] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 25 parts of homopolypropylene, 35 parts of copolymer polypropylene, 15 parts of combined negative ion powder, 5 parts of functional filler, 14 parts of talc, 4 parts of compatibilizer, 0.3 parts of coupling agent, and 1.7 parts of auxiliary agent.

[0051] The preparation method of the combined negative ion powder comprises the following steps:

[0052] N1, by mass, adds 3 parts of n-butyl titanate to 30 parts of anhydrous ethanol, then adds 2 parts of polyvinyl pyrrolidone, and after ultrasonic dispersion, adds 3.5 parts of tourmaline, stirs for 40 minutes, and then stands and ages for 10 hours to obtain a transparent gel. The obtained transparent gel is calcined at 500°C for 3 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent is ethanol. After drying, the combined negative ion powder is obtained.

[0053] The functional filler is expanded graphite.

[0054] The auxiliary agent is prepared by mixing toughening agent S-2030 and zinc stearate in a mass ratio of 1:1.

[0055] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0056] (1) 25 parts of homopolypropylene and 35 parts of copolymerized polypropylene are put into a kneader, 15 parts of combined anion powder, 5 parts of functional fillers, 14 parts of talcum powder, 4 parts of compatibilizers, 0.3 parts of coupling agents and 1.7 parts of auxiliary agents are mixed to form a mixed powder auxiliary agent, which is uniformly and continuously added to the kneader, and the speed and temperature are controlled to knead and mix to obtain a stock;

[0057] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0058] The kneader rotates at a speed of 16 r / min, and after adding the mixed powder additive, the temperature is raised to 200° C. and kneaded for 20 minutes.

[0059] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, and controls the gas injection amount to 1%; controls the injection molding machine head temperature to 200°C, the injection pressure to 65MPa, the injection rate to 75mm / s, and cools to 25°C while standing.

[0060] Example 3

[0061] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 25 parts of homopolypropylene, 35 parts of copolymer polypropylene, 15 parts of combined negative ion powder, 5 parts of functional filler, 14 parts of talc, 4 parts of compatibilizer, 0.3 parts of coupling agent, and 1.7 parts of auxiliary agent.

[0062] The preparation method of the combined negative ion powder comprises the following steps:

[0063] N1, by mass, 1.47 parts of cerium nitrate, 0.96 parts of cobalt nitrate, and 26 parts of water were mixed and stirred to obtain a cerium-cobalt ion solution; 1.64 parts of citric acid and 6 parts of water were mixed and stirred to obtain a citric acid solution;

[0064] N2, by mass, to 26 parts of the cerium cobalt ion solution prepared in step N1, 3.5 parts of tourmaline powder and 6 parts of citric acid solution were added, and the mixture was stirred for 30 minutes, then placed at 75°C and stirred for 3 hours, and finally placed at 90°C for 2 hours. After drying, it was calcined at 800°C for 5 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill was continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent was ethanol. After drying, a cerium cobalt tourmaline composite material was obtained;

[0065] N3, by mass, adds 3 parts of n-butyl titanate to 30 parts of anhydrous ethanol, then adds 2 parts of polyvinyl pyrrolidone, and after ultrasonic dispersion, adds 3.5 parts of the cerium-cobalt tourmaline composite material obtained in step N2, stirs for 40 minutes, and then stands and ages for 10 hours to obtain a transparent gel. The obtained transparent gel is calcined at 500°C for 3 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent is ethanol. After drying, the combined negative ion powder is obtained.

[0066] The functional filler is expanded graphite.

[0067] The auxiliary agent is prepared by mixing toughening agent S-2030 and zinc stearate in a mass ratio of 1:1.

[0068] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0069] (1) 25 parts of homopolypropylene and 35 parts of copolymerized polypropylene are put into a kneader, 15 parts of combined anion powder, 5 parts of functional fillers, 14 parts of talcum powder, 4 parts of compatibilizers, 0.3 parts of coupling agents and 1.7 parts of auxiliary agents are mixed to form a mixed powder auxiliary agent, which is uniformly and continuously added to the kneader, and the speed and temperature are controlled to knead and mix to obtain a stock;

[0070] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0071] The kneader rotates at a speed of 16 r / min, and after adding the mixed powder additive, the temperature is raised to 200° C. and kneaded for 20 minutes.

[0072] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, and controls the gas injection amount to 1%; controls the injection molding machine head temperature to 200°C, the injection pressure to 65MPa, the injection rate to 75mm / s, and cools to 25°C while standing.

[0073] Example 4

[0074] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 25 parts of homopolypropylene, 35 parts of copolymer polypropylene, 15 parts of combined negative ion powder, 5 parts of functional filler, 14 parts of talc, 4 parts of compatibilizer, 0.3 parts of coupling agent, and 1.7 parts of auxiliary agent.

[0075] The preparation method of the combined negative ion powder comprises the following steps:

[0076] N1, by mass, 3 parts of n-butyl titanate were added to 30 parts of anhydrous ethanol, followed by the addition of 2 parts of polyvinyl pyrrolidone. After ultrasonic dispersion, 3.5 parts of the cerium-cobalt tourmaline composite material obtained in step N2 were added, and the mixture was stirred for 40 minutes and allowed to stand for 10 hours to obtain a transparent gel. The obtained transparent gel was calcined at 500°C for 3 hours and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill was continuously operated for 20 minutes and then stopped for 5 minutes. The grinding solvent was ethanol. After drying, titanium dioxide-loaded tourmaline powder was obtained.

[0077] N2, by mass, 1.47 parts of cerium nitrate, 0.96 parts of cobalt nitrate, and 26 parts of water were mixed and stirred to obtain a cerium-cobalt ion solution; 1.64 parts of citric acid and 6 parts of water were mixed and stirred to obtain a citric acid solution;

[0078] N3, by mass, to 26 parts of the cerium cobalt ion solution obtained in step N2, 3.5 parts of the titanium dioxide-loaded tourmaline powder obtained in step N1 and 6 parts of citric acid solution were added, and the mixture was stirred for 30 minutes, then placed at 75°C and continued to stir for 3 hours, and finally placed at 90°C for 2 hours. After drying, it was calcined at 800°C for 5 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill was continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent was ethanol, and the combined negative ion powder was obtained after drying.

[0079] The functional filler is expanded graphite.

[0080] The auxiliary agent is prepared by mixing toughening agent S-2030 and zinc stearate in a mass ratio of 1:1.

[0081] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0082] (1) 25 parts of homopolypropylene and 35 parts of copolymerized polypropylene are put into a kneader, 15 parts of combined anion powder, 5 parts of functional fillers, 14 parts of talcum powder, 4 parts of compatibilizers, 0.3 parts of coupling agents and 1.7 parts of auxiliary agents are mixed to form a mixed powder auxiliary agent, which is uniformly and continuously added to the kneader, and the speed and temperature are controlled to knead and mix to obtain a stock;

[0083] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0084] The kneader rotates at a speed of 16 r / min, and after adding the mixed powder additive, the temperature is raised to 200° C. and kneaded for 20 minutes.

[0085] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, and controls the gas injection amount to 1%; controls the injection molding machine head temperature to 200°C, the injection pressure to 65MPa, the injection rate to 75mm / s, and cools to 25°C while standing.

[0086] Example 5

[0087] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 25 parts of homopolypropylene, 35 parts of copolymer polypropylene, 15 parts of combined negative ion powder, 5 parts of functional filler, 14 parts of talc, 4 parts of compatibilizer, 0.3 parts of coupling agent, and 1.7 parts of auxiliary agent.

[0088] The preparation method of the combined negative ion powder comprises the following steps:

[0089] N1, by mass, 1.47 parts of cerium nitrate, 0.96 parts of cobalt nitrate, and 26 parts of water were mixed and stirred to obtain a cerium-cobalt ion solution;

[0090] N2, by mass, to 26 parts of the cerium cobalt ion solution prepared in step N1, 3.5 parts of tourmaline powder were added, and the mixture was stirred for 30 minutes, then placed at 75°C and stirred for 3 hours, and finally placed at 90°C for 2 hours. After drying, it was calcined at 800°C for 5 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill was continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent was ethanol. After drying, a cerium cobalt tourmaline composite material was obtained;

[0091] N3, by mass, adds 3 parts of n-butyl titanate to 30 parts of anhydrous ethanol, then adds 2 parts of polyvinyl pyrrolidone, and after ultrasonic dispersion, adds 3.5 parts of the cerium-cobalt tourmaline composite material obtained in step N2, stirs for 40 minutes, and then stands and ages for 10 hours to obtain a transparent gel. The obtained transparent gel is calcined at 500°C for 3 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent is ethanol. After drying, the combined negative ion powder is obtained.

[0092] The functional filler is expanded graphite.

[0093] The auxiliary agent is prepared by mixing toughening agent S-2030 and zinc stearate in a mass ratio of 1:1.

[0094] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0095] (1) 25 parts of homopolypropylene and 35 parts of copolymerized polypropylene are put into a kneader, 15 parts of combined anion powder, 5 parts of functional fillers, 14 parts of talcum powder, 4 parts of compatibilizers, 0.3 parts of coupling agents and 1.7 parts of auxiliary agents are mixed to form a mixed powder auxiliary agent, which is uniformly and continuously added to the kneader, and the speed and temperature are controlled to knead and mix to obtain a stock;

[0096] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0097] The kneader rotates at a speed of 16 r / min, and after adding the mixed powder additive, the temperature is raised to 200° C. and kneaded for 20 minutes.

[0098] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, and controls the gas injection amount to 1%; controls the injection molding machine head temperature to 200°C, the injection pressure to 65MPa, the injection rate to 75mm / s, and cools to 25°C while standing.

[0099] Example 6

[0100] A composite material capable of releasing negative oxygen ions comprises the following components by mass: 25 parts of homopolypropylene, 35 parts of copolymer polypropylene, 15 parts of combined negative ion powder, 5 parts of functional filler, 14 parts of talc, 4 parts of compatibilizer, 0.3 parts of coupling agent, and 1.7 parts of auxiliary agent.

[0101] The preparation method of the combined negative ion powder comprises the following steps:

[0102] N1, by mass, 1.47 parts of cerium nitrate, 0.96 parts of cobalt nitrate, and 26 parts of water were mixed and stirred to obtain a cerium-cobalt ion solution; 1.64 parts of citric acid and 6 parts of water were mixed and stirred to obtain a citric acid solution;

[0103] N2: To 26 parts of the cerium-cobalt ion solution prepared in step N1, 3.5 parts of tourmaline powder and 6 parts of citric acid solution were added, and the mixture was stirred for 30 minutes. The mixture was then stirred at 75°C for 3 hours. Finally, the mixture was allowed to stand at 90°C for 2 hours, dried, and calcined at 800°C for 5 hours. The mixture was ground in an agate mortar to obtain a cerium-cobalt-tourmaline composite material.

[0104] N3, by mass, adds 3 parts of n-butyl titanate to 30 parts of anhydrous ethanol, then adds 2 parts of polyvinyl pyrrolidone, and after ultrasonic dispersion, adds 3.5 parts of the cerium-cobalt tourmaline composite material obtained in step N2, stirs for 40 minutes, and then stands and ages for 10 hours to obtain a transparent gel. The obtained transparent gel is calcined at 500°C for 3 hours, and ground using a planetary ball mill at 500 rpm for 1.5 hours. During this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent is ethanol. After drying, the combined negative ion powder is obtained.

[0105] The functional filler is expanded graphite.

[0106] The auxiliary agent is prepared by mixing toughening agent S-2030 and zinc stearate in a mass ratio of 1:1.

[0107] The present invention also provides a method for preparing a composite material capable of releasing negative oxygen ions, comprising the following steps:

[0108] (1) 25 parts of homopolypropylene and 35 parts of copolymerized polypropylene are put into a kneader, 15 parts of combined anion powder, 5 parts of functional fillers, 14 parts of talcum powder, 4 parts of compatibilizers, 0.3 parts of coupling agents and 1.7 parts of auxiliary agents are mixed to form a mixed powder auxiliary agent, which is uniformly and continuously added to the kneader, and the speed and temperature are controlled to knead and mix to obtain a stock;

[0109] (2) The blank obtained in step (1) is subjected to microporous foam injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

[0110] The kneader rotates at a speed of 16 r / min, and after adding the mixed powder additive, the temperature is raised to 200° C. and kneaded for 20 minutes.

[0111] The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, and controls the gas injection amount to 1%; controls the injection molding machine head temperature to 200°C, the injection pressure to 65MPa, the injection rate to 75mm / s, and cools to 25°C while standing.

[0112] Test Example 1

[0113] The initial negative ion release performance of the composite materials capable of releasing negative oxygen ions prepared in each embodiment was measured with reference to GB / T30128-2013 “Testing and Evaluation of Negative Ion Generation in Textiles”.

[0114] Table 1: Test results of initial negative ion release performance at room temperature

[0115] As can be seen from Table 1, the composite material capable of releasing negative oxygen ions prepared in Example 3 of the present invention has the best initial negative ion release performance, reaching 2282 / cm 3 This is because Example 3 of the present invention first uses cerium cobalt ions to dope tourmaline. Cerium cobalt ions have a special electronic structure and chemical activity, which can change the electronic energy level structure of tourmaline through the doping effect, thereby promoting the excitation and migration of electrons and increasing the generation and release of negative oxygen ions. The present invention further uses titanium dioxide to load the tourmaline doped with cerium cobalt ions. Titanium dioxide, as a semiconductor material, can absorb energy under light conditions, stimulate electronic transitions, and promote the generation and release of negative oxygen ions. The advantage of jointly adding titanium dioxide and cerium cobalt ions lies in the interaction and synergistic effect between the two. Titanium dioxide can absorb light energy and transfer it to cerium cobalt ions, further exciting electrons in tourmaline and increasing the generation of negative oxygen ions. Doping with cerium cobalt ions can regulate the electronic structure and surface activity of tourmaline, provide more active sites and reaction centers, and help enhance the release effect of negative oxygen ions.

[0116] In addition, from the comparison of Example 5, Example 6 and Example 3, it can be found that the addition of citric acid can effectively promote the doping of cerium cobalt ions into tourmaline, and obtain a cerium cobalt tourmaline composite material with a smaller particle size by ball milling, which is beneficial to the loading of titanium dioxide on the cerium cobalt tourmaline composite material, obtaining a larger contact area, thereby promoting the generation of negative ions.

[0117] Test Example 2

[0118] Determination of the negative ion release efficiency of samples at room temperature for a long time:

[0119] Basic principle: Based on the basic principle of polymer mechanical relaxation and the mechanical "time-temperature equivalent model", combined with the mechanical data of polypropylene after aging, the WLF equation is used to derive the influencing factors and pipe parameters of the reduction in its breaking strength and elongation at break. Then, the numerical changes in the release of negative ions of polypropylene composite materials under normal conditions and after heat treatment are compared, and a "time-temperature equivalent model" for the release of negative ions from polypropylene composite materials is established. By treating the samples at high temperature for a short time in the laboratory, the long-term negative ion release efficiency of the samples at room temperature can be inferred.

[0120] Table 2: Long-term negative ion release efficacy at room temperature

[0121] As can be seen from Table 2, the composite material of the negative oxygen ion release function obtained in Example 3 can still stably release a large amount of negative ions after 3 years at room temperature, and its complete failure period is as long as 20 years, reflecting a long service life. The present invention believes that this is the effect produced by the synergistic effect of cerium cobalt ion doping and titanium dioxide loading. Titanium dioxide can absorb light energy and transfer it to cerium cobalt ions, further exciting the electrons in tourmaline, and increasing the generation of negative oxygen ions. The doping of cerium cobalt ions can regulate the electronic structure and surface activity of tourmaline, provide more active sites and reaction centers, help to enhance the release amount of negative oxygen ions, thereby slowing down its decay rate. On the other hand, the protective layer formed by the two can effectively reduce the adsorption capacity of tourmaline to pollutants in the air, and play a role in purification, thereby extending the service life of tourmaline.

Claims

1. A composite material capable of releasing negative oxygen ions, characterized in that: The composition includes the following components by weight: 20-30 parts of homopolymer polypropylene, 30-45 parts of copolymer polypropylene, 10-20 parts of combined anion powder, 5-10 parts of functional filler, 10-15 parts of talc, 3-5 parts of compatibilizer, 0.2-0.5 parts of coupling agent, and 1-2 parts of auxiliary agent; The preparation method of the combined negative ion powder comprises the following steps: N1, by mass, 1.4-1.5 parts of cerium nitrate, 0.9-1 parts of cobalt nitrate, and 20-30 parts of water are mixed and stirred to obtain a cerium-cobalt ion solution; 1.6-1.7 parts of citric acid and 5-10 parts of water are mixed and stirred to obtain a citric acid solution; N2: Add 3-4 parts of tourmaline powder and 5-10 parts of citric acid solution to 20-30 parts of the cerium cobalt ion solution prepared in step N1, stir for 30-40 minutes, then place at 70-80°C and continue stirring for 2-4 hours, finally place at 85-90°C and stand for 1-2 hours, dry and place at 700-800°C for calcination for 5-6 hours, grind with a planetary ball mill at 500 rpm for 1-2 hours, during which the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes, the grinding solvent is ethanol, and the cerium cobalt tourmaline composite material is obtained after drying; N3, by mass, adds 2-4 parts of n-butyl titanate to 28-31 parts of anhydrous ethanol, then adds 1-3 parts of polyvinyl pyrrolidone, and after ultrasonic dispersion, adds 3-4 parts of the cerium cobalt tourmaline composite material obtained in step N2, stirs for 30-60 minutes, and then stands for aging for 8-12 hours to obtain a transparent gel. The obtained transparent gel is calcined at 450-550°C for 2-4 hours, and ground with a planetary ball mill at 500rpm for 1-2 hours. During this process, the high-speed planetary ball mill is continuously operated for 20 minutes and stopped for 5 minutes. The grinding solvent is ethanol. After drying, the combined negative ion powder is obtained.

2. The composite material capable of releasing negative oxygen ions as claimed in claim 1, characterized in that: The melt index MI of the homopolymer polypropylene is 9-30 g / 10 min.

3. The composite material capable of releasing negative oxygen ions as claimed in claim 1, characterized in that: The copolymerized polypropylene has a melt index of 10-30 g / 10 min.

4. The composite material capable of releasing negative oxygen ions as claimed in claim 1, characterized in that: The functional filler is a filler having a microporous layered channel structure.

5. A method for preparing a composite material capable of releasing negative oxygen ions, for preparing the composite material capable of releasing negative oxygen ions as claimed in any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: (1) Put 20-30 parts of homopolymer polypropylene and 30-45 parts of copolymer polypropylene into a kneading machine, add 10-20 parts of combined anion powder, 5-10 parts of functional filler, 10-15 parts of talc, 3-5 parts of compatibilizer, 0.2-0.5 parts of The coupling agent and 1-2 parts of the auxiliary agent are mixed evenly to form a mixed powder auxiliary agent, which is added evenly and continuously into a kneading machine, and the speed and temperature are controlled to knead and mix to obtain a blank; (2) The blank obtained in step (1) is subjected to microcellular foaming injection molding by an injection molding machine to obtain the composite material capable of releasing negative oxygen ions.

6. The method for preparing the composite material capable of releasing negative oxygen ions as claimed in claim 5, characterized in that: The rotating speed of the kneading machine is 12-18 r / min. After adding the mixed powder additive, the temperature is raised to 190-220° C. and kneaded for 15-30 minutes.

7. The method for preparing the composite material capable of releasing negative oxygen ions as claimed in claim 5, characterized in that: The microcellular foam injection molding uses supercritical inert gas nitrogen or helium as a physical pore-forming foaming agent, controls the gas injection amount to 0.5-1.5%, controls the injection molding machine head temperature to 190-220°C, the injection pressure to 55-85MPa, the injection rate to 60-90mm / s, and cools to 24-26°C while standing.

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