Low-odor flame-retardant antibacterial HIPS material for electric appliances and preparation method thereof
阅读说明：本技术 一种电器用低气味阻燃抗菌hips材料及其制备方法 (Low-odor flame-retardant antibacterial HIPS material for electric appliances and preparation method thereof ) 是由 邢纪普 李益祖 杨亚娣 徐元元 郭雪晴 李荣群 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种电器用低气味阻燃抗菌HIPS材料及其制备方法,其由41-70份HIPS树脂、18-32份复合阻燃剂、10-20份抗菌母粒、2.7-7份其他助剂按照重量份制备而成；其中,所述复合阻燃剂由溴系阻燃剂、三氧化二锑、磷酸酯阻燃剂按照(11-18)：(3-6)：(4-10)质量比组成。本发明通过选用合适的HIPS原材料,从材料分子结构入手,优选小分子高流动性原材料,采用溴系阻燃剂、三氧化二锑、磷酸酯阻燃剂三者复配,对提高阻燃性具有良好协同作用。本发明采用的HIPS抗菌母粒,采用的芫荽纤维有来源广泛,成本低特点,能有效抑制细菌滋生；另外芫荽纤维内部特殊的超细微孔结构使其具有强劲的吸附能力,能吸附空气中甲醛、苯、甲苯、氨等有害物质,消除不良气味。(The invention discloses a low-odor flame-retardant antibacterial HIPS material for electric appliances and a preparation method thereof, wherein the low-odor flame-retardant antibacterial HIPS material is prepared from 41-70 parts of HIPS resin, 18-32 parts of composite flame retardant, 10-20 parts of antibacterial master batch and 2.7-7 parts of other auxiliary agents in parts by weight; wherein the composite flame retardant is prepared from a brominated flame retardant, antimony trioxide and a phosphate flame retardant according to the proportion of (11-18): (3-6): (4-10) mass ratio. According to the invention, by selecting a proper HIPS raw material, starting from a material molecular structure, a small-molecular high-fluidity raw material is preferably selected, and a brominated flame retardant, antimony trioxide and a phosphate flame retardant are compounded, so that the flame retardant has a good synergistic effect on improving flame retardance. The HIPS antibacterial master batch adopted by the invention has the characteristics of wide sources and low cost, and can effectively inhibit bacterial breeding; in addition, the special ultrafine pore structure in the coriander fibers enables the coriander fibers to have strong adsorption capacity, and can adsorb harmful substances such as formaldehyde, benzene, toluene, ammonia and the like in the air and eliminate bad smell.)
1. A low-odor flame-retardant antibacterial HIPS material for electric appliances is characterized by being prepared from 41-70 parts of HIPS resin, 18-32 parts of a composite flame retardant, 10-20 parts of an antibacterial master batch and 2.7-7 parts of other auxiliary agents in parts by weight; wherein the composite flame retardant is prepared from a brominated flame retardant, antimony trioxide and a phosphate flame retardant according to the proportion of (11-18): (3-6): (4-10) mass ratio.
2. The low-odor flame-retardant antibacterial HIPS material for electric appliances according to claim 1, wherein the bromine-based flame retardant comprises at least one of decabromodiphenyl ether, octabromodiphenyl ether, tetrabromobisphenol A, decabromodiphenyl ethane, brominated epoxy oligomer, polydecabromostyrene, tris (tribromophenyl) cyanurate.
3. The low-odor flame-retardant antibacterial HIPS material for electric appliances according to claim 1, wherein the phosphate flame retardant is at least one of 1,3 phenylene phosphoric acid (2, 6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivative flame retardant (BDP), tetraphenyl resorcinol diphosphate and its derivative (RDP) flame retardant, and triphenyl phosphate (TPP) flame retardant.
4. The low-odor flame-retardant antibacterial HIPS material for electric appliances as claimed in claim 1, wherein the antibacterial masterbatch is prepared from HIPS resin, coriander fiber, SBS resin, titanate coupling agent and lubricant according to the weight ratio of 40: 40: 20: (1-1.5): (0.2-0.8) in weight ratio.
5. The low-odor flame-retardant antibacterial HIPS material for electric appliances as claimed in claim 1, wherein the other auxiliary agents are selected from antioxidants, light stabilizers, anti-dripping agents, lubricants, antistatic agents in the following ratio (0.4-1): (0.7-2): (0.5-1): (0.6-2): (0.5-1) in weight ratio.
6. The low-odor flame-retardant antibacterial HIPS material for electric appliances as claimed in claim 5, wherein the antioxidant is compounded by hindered phenol antioxidant 1076 and phosphite antioxidant 168 according to a weight ratio of 1: 1.
7. The low-odor flame-retardant antibacterial HIPS material for electric appliances according to claim 5, wherein the light stabilizer is at least one of UV531, UV326, UV327, UV328, UV329, UV770 and UV-P.
8. The low odor, flame retardant, antimicrobial HIPS material for electrical appliances of claim 5, wherein the anti-dripping agent is a PTFE compound.
9. A low-odor flame-retardant antibacterial HIPS material for electric appliances according to claim 5, wherein said lubricant is at least one of calcium stearate, zinc stearate, magnesium stearate, EBS, PETS, silicones.
10. The method for preparing a low-odor flame-retardant antibacterial HIPS material for electric appliances, as set forth in any one of claims 1 to 9, comprising the steps of:
(1) weighing HIPS resin, a brominated flame retardant and antimony trioxide according to the weight parts, adding the weighed materials into a low-mixing machine, and mixing for 3-5 minutes at the rotating speed of 200-300r/min to obtain a first mixture;
(2) weighing the antioxidant, the lubricant, the light stabilizer, the anti-dripping agent and the antistatic agent according to the weight parts, adding the weighed materials into a high-speed mixer, and mixing for 6-10 minutes at the rotating speed of 400-600r/min to obtain a second mixture;
(3) adding the first mixture into the second mixture, and mixing for 6-10 minutes in a high mixing machine at the rotating speed of 300-400r/min to obtain a third mixture;
(4) adding the third mixture into main feed of a parallel double-screw extruder, weighing the phosphate flame retardant according to the weight parts, feeding the phosphate flame retardant through the 4-5 sections of extrusion stages under nitrogen protection, weighing the antibacterial master batch according to the weight parts, feeding the antibacterial master batch from the 6-7 sections under nitrogen protection, and obtaining the low-odor flame-retardant antibacterial HIPS material for the electric appliance through melting, melt-mixing and extrusion granulation;
wherein the cylinder temperature of the parallel double-screw extruder is 180-210 ℃, the screw rotating speed is 400-500 r/min, the melt pressure is controlled to be 1.5-1.8 MPa, and the vacuum degree is-0.04-0.08 MPa.
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a low-odor flame-retardant antibacterial HIPS material for electric appliances and a preparation method thereof.
Background
HIPS (high impact polystyrene) not only has excellent mechanical properties with balanced corrosion resistance, toughness, hardness and rigidity, but also has better dimensional stability, surface gloss and coloring capacity. As an important thermoplastic engineering plastic, the thermoplastic engineering plastic is widely applied to the aspects of residential houses, household appliances, electronic and electric appliances, automobile industry and the like. However, the fact that HIPS has an oxygen index of only 18% and is a flammable resin, continues to burn after leaving the fire and releases a large amount of smoke and toxic gases limits its application. The flame-retardant HIPS is easy to degrade and yellow, more appearance parts are contacted, and bacteria are bred, such as air conditioners, washing machines, small household appliance shells and the like. The flame retardant property and the antibacterial property of HIPS are improved, so that the problem to be solved in the industry is solved. There have been some studies on antibacterial flame-retardant HIPS composite materials before, but there are problems of peculiar smell, low flame-retardant grade V0, yellowing of material color and the like during use.
Disclosure of Invention
The invention aims to provide a low-odor flame-retardant antibacterial HIPS material for electric appliances and a preparation method thereof, which are used for solving the problems in the background art, and can ensure that the material has excellent flame retardant property which reaches 2.5mm 5VA and has good antibacterial property and low odor.
The invention discloses a low-odor flame-retardant antibacterial HIPS material for electric appliances, which is prepared from 41-70 parts of HIPS resin, 18-32 parts of composite flame retardant, 10-20 parts of antibacterial master batch and 2.7-7 parts of other auxiliary agents in parts by weight; wherein the composite flame retardant is prepared from a brominated flame retardant, antimony trioxide and a phosphate flame retardant according to the proportion of (11-18): (3-6): (4-10) mass ratio.
Further scheme: the bromine flame retardant comprises at least one of decabromodiphenyl ether, octabromodiphenyl ether, tetrabromobisphenol A, decabromodiphenyl ethane, brominated epoxy oligomer, polydecabromostyrene and tris (tribromophenyl) cyanurate.
Further scheme: the phosphate flame retardant is at least one of 1,3 phenylene phosphoric acid (2, 6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and derivative flame retardant (BDP) thereof, tetraphenyl resorcinol diphosphate and derivative (RDP) flame retardant thereof and triphenyl phosphate (TPP) flame retardant.
Further scheme: the antibacterial master batch is prepared from HIPS resin, coriander fiber, SBS resin, titanate coupling agent and lubricant according to the weight ratio of 40: 40: 20: (1-1.5): (0.2-0.8) in weight ratio.
Further scheme: the other auxiliary agents comprise an antioxidant, a light stabilizer, an anti-dripping agent, a lubricant and an antistatic agent according to the proportion of (0.4-1): (0.7-2): (0.5-1): (0.6-2): (0.5-1) in weight ratio.
Further scheme: the antioxidant is prepared by compounding hindered phenol antioxidant 1076 and phosphite antioxidant 168 according to the weight ratio of 1: 1.
Further scheme: the light stabilizer is at least one of UV531, UV326, UV327, UV328, UV329, UV770 and UV-P.
Further scheme: the anti-dripping agent is a PTFE compound.
Further scheme: the lubricant is at least one of calcium stearate, zinc stearate, magnesium stearate, EBS, PETS and silicone.
On the other hand, the invention discloses a preparation method of the low-odor flame-retardant antibacterial HIPS material for the electric appliance, which comprises the following steps:
(1) weighing HIPS resin, a brominated flame retardant and antimony trioxide according to the weight parts, adding the weighed materials into a low-mixing machine, and mixing for 3-5 minutes at the rotating speed of 200-300r/min to obtain a first mixture;
(2) weighing the antioxidant, the lubricant, the light stabilizer, the anti-dripping agent and the antistatic agent according to the weight parts, adding the weighed materials into a high-speed mixer, and mixing for 6-10 minutes at the rotating speed of 400-600r/min to obtain a second mixture;
(3) adding the first mixture into the second mixture, and mixing for 6-10 minutes in a high mixing machine at the rotating speed of 300-400r/min to obtain a third mixture;
(4) adding the third mixture into main feed of a parallel double-screw extruder, weighing the phosphate flame retardant according to the weight parts, feeding the phosphate flame retardant through the 4-5 sections of extrusion stages under nitrogen protection, weighing the antibacterial master batch according to the weight parts, feeding the antibacterial master batch from the 6-7 sections under nitrogen protection, and obtaining the low-odor flame-retardant antibacterial HIPS material for the electric appliance through melting, melt-mixing and extrusion granulation;
wherein the cylinder temperature of the parallel double-screw extruder is 180-210 ℃, the screw rotating speed is 400-500 r/min, the melt pressure is controlled to be 1.5-1.8 MPa, and the vacuum degree is-0.04-0.08 MPa.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by selecting a proper HIPS raw material, starting from a material molecular structure, a small-molecular high-fluidity raw material is preferably selected, and a brominated flame retardant, antimony trioxide and a phosphate flame retardant are compounded, so that the flame retardant has a good synergistic effect on improving flame retardance. The bromine flame retardant and the antimony trioxide generate hydrogen bromide in the combustion reaction, and the hydrogen bromide can capture and transfer active free radicals of the combustion chain reaction to generate bromine free radicals with low activity, such as the bromine antimony oxide and the bromine antimony bromide, so that the combustion is slowed down or stopped. In addition, the hydrogen bromide is a dense gas and is difficult to combust, and not only can dilute oxygen in air, but also can cover the surface of the material to replace air, so that the combustion speed of the material is reduced or the material is self-extinguished. When the phosphate flame retardant is burnt, a flame-retardant carbon layer is formed on the surface of the material by a method of isolating oxygen and heat, so that the material is prevented from being heated and continuously decomposed. The water vapor formed by dehydration on the surface of the combustion contact layer can dilute the concentration of oxygen, oxygen free radicals and combustible gas. The three components have synergistic effect in gas phase, liquid phase and solid phase, so that the material reaches higher-grade flame retardant 5 VA.
The HIPS antibacterial master batch adopted by the invention has the characteristics of wide sources and low cost, and can effectively inhibit bacterial breeding; in addition, the special ultrafine pore structure in the coriander fibers enables the coriander fibers to have strong adsorption capacity, and can adsorb harmful substances such as formaldehyde, benzene, toluene, ammonia and the like in the air and eliminate bad smell. After being dried in the sun, the adsorbed harmful substances can be volatilized, so that the adsorption function of the adsorbent can be automatically regenerated. The preparation method is simple and convenient to process, the prepared antibacterial master batch has a good antibacterial effect, and meanwhile, the coriander fiber is added, so that the antibacterial master batch can reinforce the material and has good impact property. The coriander fibers are coupled by adopting a titanate coupling agent, so that the good interface bonding force with HIPS resin is improved, the material strength is improved, and the good antibacterial effect of the material is promoted.
According to the invention, the double-screw combination and the extrusion process are optimally configured, in the main feed of the parallel double-screw extruder, the phosphate flame retardant is fed and added through the lower side of 4-5 extrusion stages under the protection of nitrogen gas, and the antibacterial master batch is fed and added through the side of 6-7 extrusion stages under the protection of nitrogen gas, so that the low-odor flame-retardant antibacterial HIPS material for the electric appliance is obtained through melting, mixing and extrusion granulation, and the low-odor flame-retardant antibacterial HIPS material has the advantages of high flame retardance, stable antibacterial performance, low odor and yellowing resistance.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The following examples and comparative examples employ the following raw material specific information:
HIPS resins, Dadale HIPS 6351, HIPS polymerized in bulk.
The bromine flame retardant is prepared by compounding decabromodiphenylethane and tri (tribromophenyl) cyanurate according to the weight ratio of 1:3,
antimony trioxide, the purity is more than or equal to 99.99 percent, the grain diameter D50 is 0.5 mu m, the whiteness is more than or equal to 98, and the manufacturer is the Limited liability company of antimony flashing industry in Hunan province;
the phosphate flame retardant comprises tetraphenyl (bisphenol-A) diphosphate (BDP), tetraphenyl resorcinol diphosphate and derivatives thereof (RDP) flame retardant and triphenyl phosphate (TPP) in the weight ratio: 1:2:1, the manufacturer is Zhejiang Wanshengmen company;
the antibacterial master batch is prepared by self, and the preparation method comprises the following steps:
putting 40 parts of coriander fiber into N, N-dimethylacrylamide in a reactor, introducing nitrogen to enable the interior of the reactor to be an inert environment, heating to 120-160 ℃, keeping for 1-2 hours, adding 1-1.5 parts of titanate coupling agent into the reactor, heating to 150-160 ℃, keeping for 2-3 hours, and cooling to room temperature to obtain the modified coriander fiber.
And taking 40 parts of modified coriander fiber, adding 40 parts of HIPS, 20 parts of SBS and 0.5 part of lubricant, dispersing and stirring uniformly in a high-speed mixing pot to obtain a mixed material, and adding the mixed material into a double-screw extruder for extrusion and granulation to obtain the coriander fiber antibacterial master batch. Temperature of each zone of the twin-screw extruder: 170 ℃ and 200 ℃, the rotating speed of the screw is 450r/min, the melt pressure is controlled to be 1.6MPa, and the vacuum degree is controlled to be-0.04 to-0.08 MPa.
The side feeding is carried out in the 6 th to 7 th sections, so that the fiber length of coriander fibers can be prevented from being excessively cut, and the good strength of the material is ensured; in addition, the material is not excessively sheared, so that peculiar smell is not generated, and the natural faint scent of coriander fiber is provided. The preparation method is simple and convenient to process, and the prepared antibacterial master batch has a good antibacterial effect.
The antioxidant is compounded by a Pasteur hindered phenol antioxidant 1076 and a phosphite ester antioxidant 168 according to the weight ratio of 1: 1.
The light stabilizer is prepared by compounding UV770 and UV-P according to the weight ratio of 3:1, and is produced by Tianjin Lianlong new material company Limited;
an anti-dripping agent, modified polytetrafluoroethylene SN3300 produced by Guangzhou entropy energy Innovation materials GmbH;
the lubricant is prepared by compounding calcium stearate and EBS according to the weight ratio of 1: 2; the manufacturer of the calcium stearate is Hanwei science and technology Co., Ltd, Dongguan city, the trade name is CV500, and the manufacturer of the EBS is plastic material Co., Ltd, which can succeed in the competition in Changzhou;
antistatic agent, ATMER 190, UK Daozha;
all materials are conventional and common products sold in the market.
It is understood that the above raw material reagents are only examples of some specific embodiments of the present invention, so as to make the technical scheme of the present invention more clear, and do not represent that the present invention can only adopt the above reagents, particularly, the scope of the claims is subject to. In addition, "parts" described in examples and comparative examples mean parts by weight unless otherwise specified.
Any range recited herein is intended to include the endpoints and any number between the endpoints and any subrange subsumed therein or defined therein.
Example 1
The components in the embodiment are weighed according to the following parts by weight: 69.3 parts of HIPS resin, 11 parts of brominated flame retardant, 3 parts of antimony trioxide, 4 parts of phosphate flame retardant, 10 parts of antibacterial master batch, 0.4 part of antioxidant, 0.7 part of light stabilizer, 0.5 part of anti-dripping agent, 0.6 part of lubricant and 0.5 part of antistatic agent.
Adding HIPS resin, a brominated flame retardant and antimony trioxide into a low-speed mixer, and mixing for 3 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing for 6 minutes at a rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 6 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the phosphate ester flame retardant through the extrusion stage under the protection of 5 sections of nitrogen, feeding the antibacterial master batch from 7 sections of sides under the protection of nitrogen, melting, mixing, extruding and granulating to obtain the low-odor flame-retardant antibacterial HIPS material for the electric appliance;
wherein the cylinder temperature of the parallel double-screw extruder is 200 ℃, the screw rotating speed is 400r/min, the melt pressure is controlled to be 1.5MPa, and the vacuum degree is-0.04 to-0.06 MPa.
Example 2
The components in the embodiment are weighed according to the following parts by weight: 59.5 parts of HIPS resin, 13 parts of brominated flame retardant, 3.5 parts of antimony trioxide, 6 parts of phosphate flame retardant, 14 parts of antibacterial master batch, 0.5 part of antioxidant, 1 part of light stabilizer, 0.6 part of anti-dripping agent, 1.2 parts of lubricant and 0.7 part of antistatic agent.
Adding HIPS resin, a brominated flame retardant and antimony trioxide into a low-speed mixer, and mixing for 4 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing for 7 minutes at a rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 8 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the phosphate ester flame retardant through the lower side of 4 sections of extrusion stages under the protection of nitrogen, feeding the antibacterial master batch from the 7 sections under the protection of nitrogen, melting, mixing, extruding and granulating to obtain the low-odor flame-retardant antibacterial HIPS material for the electric appliance;
wherein the cylinder temperature of the parallel double-screw extruder is 190 ℃, the screw rotating speed is 450r/min, the melt pressure is controlled to be 1.6MPa, and the vacuum degree is-0.04 to-0.06 MPa.
Example 3
The components in the embodiment are weighed according to the following parts by weight: 49.4 parts of HIPS resin, 14.5 parts of brominated flame retardant, 4.5 parts of antimony trioxide, 8 parts of phosphate flame retardant, 18 parts of antibacterial master batch, 0.9 part of antioxidant, 1.5 parts of light stabilizer, 0.8 part of anti-dripping agent, 1.6 parts of lubricant and 0.8 part of antistatic agent.
Adding HIPS resin, a brominated flame retardant and antimony trioxide into a low-speed mixer, and mixing for 5 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing for 8 minutes at a rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 8 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the phosphate ester flame retardant through the extrusion stage under the protection of 5 sections of nitrogen, feeding the antibacterial master batch from 6 sections of sides under the protection of nitrogen, melting, mixing, extruding and granulating to obtain the low-odor flame-retardant antibacterial HIPS material for the electric appliance;
wherein the cylinder temperature of the parallel double-screw extruder is 210 ℃, the screw rotating speed is 500r/min, the melt pressure is controlled to be 1.7MPa, and the vacuum degree is-0.04 to-0.07 MPa.
Example 4
The components in the embodiment are weighed according to the following parts by weight: 41 parts of HIPS resin, 16 parts of brominated flame retardant, 6 parts of antimony trioxide, 10 parts of phosphate flame retardant, 20 parts of antibacterial master batch, 1 part of antioxidant, 2 parts of light stabilizer, 1 part of anti-dripping agent, 2 parts of lubricant and 1 part of antistatic agent.
Adding HIPS resin, a brominated flame retardant and antimony trioxide into a low-speed mixer, and mixing for 5 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing at a rotating speed of 500r/min for 10 minutes to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 10 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the phosphorus ester flame retardant through the lower side of 4 sections of extrusion stages under the protection of nitrogen, feeding the antibacterial master batch from the side of 6 sections under the protection of nitrogen, melting, mixing, extruding and granulating to obtain the low-odor flame-retardant antibacterial HIPS material for the electric appliance;
wherein the cylinder temperature of the parallel double-screw extruder is 210 ℃, the screw rotating speed is 500r/min, the melt pressure is controlled to be 1.8MPa, and the vacuum degree is-0.04 to-0.08 MPa.
Comparative example 1
The components in the comparative example are weighed according to the following parts by weight: 69.3 parts of HIPS resin, 4 parts of phosphate flame retardant, 11 parts of brominated flame retardant, 10 parts of antibacterial master batch, 0.4 part of antioxidant, 0.7 part of light stabilizer, 0.5 part of anti-dripping agent, 0.6 part of lubricant and 0.5 part of antistatic agent.
Adding HIPS resin and a brominated flame retardant into a low-speed mixer, and mixing for 3 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing for 6 minutes at a rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 6 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the phosphate ester flame retardant through the extrusion stage under the protection of 5 sections of nitrogen, feeding the antibacterial master batch from 7 sections of sides under the protection of nitrogen, melting, mixing, extruding and granulating to obtain the low-odor flame-retardant antibacterial HIPS material for the electric appliance;
wherein the cylinder temperature of the parallel double-screw extruder is 200 ℃, the screw rotating speed is 400r/min, the melt pressure is controlled to be 1.5MPa, and the vacuum degree is-0.04 to-0.06 MPa.
Comparative example 2
The components in the comparative example are weighed according to the following parts by weight: 69.3 parts of HIPS resin, 11 parts of brominated flame retardant, 3 parts of antimony trioxide, 10 parts of antibacterial master batch, 0.4 part of antioxidant, 0.7 part of light stabilizer, 0.5 part of anti-dripping agent, 0.6 part of lubricant and 0.5 part of antistatic agent.
Adding HIPS resin, a brominated flame retardant and antimony trioxide into a low-speed mixer, and mixing for 3 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing for 6 minutes at a rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 6 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the antibacterial master batch from 7 sections under the protection of nitrogen, melting, mixing, extruding and granulating to obtain the low-odor flame-retardant antibacterial HIPS material for the electric appliance;
wherein the cylinder temperature of the parallel double-screw extruder is 200 ℃, the screw rotating speed is 400r/min, the melt pressure is controlled to be 1.5MPa, and the vacuum degree is-0.04 to-0.06 MPa.
Comparative example 3
The components in the comparative example are weighed according to the following parts by weight: 69.3 parts of HIPS resin, 11 parts of brominated flame retardant, 3 parts of antimony trioxide, 4 parts of phosphate flame retardant, 10 parts of wheat straw fiber master batch, 0.4 part of antioxidant, 0.7 part of light stabilizer, 0.5 part of anti-dripping agent, 0.6 part of lubricant and 0.5 part of antistatic agent. Wherein, the preparation process of the wheat straw fiber master batch in the comparative example is as follows:
putting 40 parts of wheat straw fiber into N, N-dimethylacrylamide in a reactor, introducing nitrogen to make the interior of the reactor inert, heating to 120-plus-130 ℃, keeping for 1-2h, adding 1-1.5 parts of titanate coupling agent into the reactor, heating to 150-plus-160 ℃, keeping for 2-3 h, and cooling to room temperature to obtain the modified wheat straw fiber.
Taking 40 parts of modified wheat straw fiber, adding 40 parts of HIPS resin, 20 parts of SBS resin and 0.5 part of lubricant, uniformly dispersing and stirring in a high mixing pot, and then extruding and granulating through a double-screw extruder, wherein the processing temperature is as follows: 170 ℃ and 200 ℃, the rotating speed of the screw is 450r/min, the melt pressure is controlled to be 1.6MPa, and the vacuum degree is controlled to be-0.04 to-0.08 MPa. Obtaining the wheat straw fiber master batch.
Adding HIPS resin, a brominated flame retardant and antimony trioxide into a low-speed mixer, and mixing for 3 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding an antioxidant, a lubricant, a light stabilizer, an anti-dripping agent and an antistatic agent into a high-speed mixer, and mixing for 6 minutes at a rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 6 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, feeding the phosphate flame retardant through the extrusion stage under the protection of 5 sections of introduced nitrogen, feeding the wheat straw fiber master batch from 7 sections of sides under the protection of introduced nitrogen, melting, mixing, extruding and granulating to obtain the modified composite HIPS material;
wherein the cylinder temperature of the parallel double-screw extruder is 200 ℃, the screw rotating speed is 400r/min, the melt pressure is controlled to be 1.5MPa, and the vacuum degree is-0.04 to-0.06 MPa.
Comparative example 4
The components in the comparative example are weighed according to the following parts by weight: 69.3 parts of HIPS resin, 11 parts of brominated flame retardant, 3 parts of antimony trioxide, 4 parts of phosphate flame retardant, 10 parts of antibacterial master batch, 0.4 part of antioxidant, 0.7 part of light stabilizer, 0.5 part of anti-dripping agent, 0.6 part of lubricant and 0.5 part of antistatic agent.
Adding HIPS resin, a brominated flame retardant, antimony trioxide and a phosphate flame retardant into a low-speed mixer, and mixing for 3 minutes at a rotating speed of 250r/min to obtain a first mixture;
adding the antioxidant, the lubricant, the light stabilizer, the anti-dripping agent, the antistatic agent and the antibacterial master batch into a high-speed mixer, and mixing for 6 minutes at the rotating speed of 500r/min to obtain a second mixture;
adding the first mixture into the second mixture, and mixing for 6 minutes in a high-speed mixer at a rotating speed of 400r/min to obtain a third mixture;
adding the third mixture into the main feed of a parallel double-screw extruder, and performing melting, melt mixing, extrusion granulation to obtain the flame-retardant antibacterial HIPS material;
wherein the cylinder temperature of the parallel double-screw extruder is 200 ℃, the screw rotating speed is 400r/min, the melt pressure is controlled to be 1.5MPa, and the vacuum degree is-0.04 to-0.06 MPa.
The products prepared in the above examples 1 to 4 and comparative examples 1 to 4 were pressed into a plate having the same thickness, and a plastic sample of 50mm x 50mm was prepared and subjected to an antibacterial test. Antibacterial test standard: QB/T2591-2003, antibacterial Plastic antibacterial property test method and antibacterial effect. Detection bacteria: escherichia coli (Escherichia coli) ATCC 25922. Test specimens and panels were prepared according to the UL94 standard and tested for flammability performance. Odor performance was tested according to the popular PV3900 standard. The test results are shown in table 1.
TABLE 1
From table 1, the brominated flame retardant, the antimony trioxide and the phosphate flame retardant adopted by the invention have good synergistic effect, and the three flame retardants all achieve synergistic effect on gas phase, liquid phase and solid phase, so that the material achieves higher-grade flame retardance of 5VA, and the mechanical property of the material is not influenced. The coriander fibers play a good role in adsorption, the odor of the material prepared in the embodiment is detected to be above 4.0 grade according to the PV3900 standard, and meanwhile, due to the reinforcing effect of the coriander fibers, the impact performance of the material is good and reaches 65KJ/m2The above. In comparison between comparative example 4 and example 1: the phosphate flame retardant and the other two flame retardants are respectively added into the flame retardant, and are independently addedThe 7 th section of side feeding is added under the protection of introducing nitrogen into the antibacterial master batch, so that the material can achieve better antibacterial property and flame retardance.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.