CN113174127B - PC/ABS alloy with high shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect and preparation method thereof - Google Patents

PC/ABS alloy with high shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect and preparation method thereof Download PDF

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CN113174127B
CN113174127B CN202110565857.8A CN202110565857A CN113174127B CN 113174127 B CN113174127 B CN 113174127B CN 202110565857 A CN202110565857 A CN 202110565857A CN 113174127 B CN113174127 B CN 113174127B
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titanium dioxide
raw materials
shading
master batch
parts
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CN113174127A (en
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张毅
赵志刚
程方清
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Guangdong Jinci New Material Technology Co.,Ltd.
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Shanghai Changwei Jinci Engineering Plastic Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract

The invention relates to the field of high polymer materials, in particular to a PC/ABS alloy with high light shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect, which comprises the following components in parts by weight: 40-70 parts of PC resin, 10-20 parts of SAN resin, 1-30 parts of high-shading titanium dioxide master batch, 1-20 parts of photocatalyst titanium dioxide master batch, 1-20 parts of flexibilizer, 0.1-2 parts of dispersing agent and 0.1-1 part of antioxidant. The invention also provides a preparation method of the PC/ABS alloy. The alloy material has the performances of high shading, high whiteness, high weather resistance, screw column slippage prevention, excellent antibacterial effect and the like, and can be widely applied to components such as white household appliance shells and the like.

Description

PC/ABS alloy with high shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect and preparation method thereof
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a PC/ABS alloy with high light shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect and a preparation method thereof.
Background
Polycarbonate (PC) is a linear polycarbonate, an amorphous engineering plastic, and has good toughness, transparency, and heat resistance. ABS has good flow and impact properties. Therefore, the blending of PC and ABS can integrate the excellent performances of PC and ABS, thereby not only improving the heat resistance and tensile strength of ABS, but also reducing the melt viscosity of PC and improving the processability. Therefore, PC/ABS alloy materials are widely used in housings of white electric appliances. The white household appliance shell is mostly provided with an LED display lamp, is used for white PC/ABS in the field, and has high requirements on shading degree, whiteness, weather resistance and screw column toughness.
Chinese patent document CN103333453A discloses a high light-shielding ABS composite material and a preparation method thereof, wherein the high light-shielding ABS material is realized by adding barium sulfate and titanium dioxide in different proportions. Chinese patent document CN104962056A discloses a high light-shielding PC material and a preparation method thereof, which is realized by adding titanium dioxide with appropriate particle size and covering power. Chinese patent document CN711978699A discloses a high-shading thin-wall flame-retardant PC material, a preparation method and application thereof, and the high-shading and thin-wall flame-retardant effects are realized by high addition amount of rutile titanium dioxide, other flame retardants and toughening agents. However, the particle size and kind of titanium dioxide, opacity, weather resistance, screw post thread slipping and poor fracture when screwing 10 in and 10 out, and antibacterial performance are not described in these patent documents.
Disclosure of Invention
The invention aims to provide a PC/ABS alloy with high shading, high weather resistance, screw post slippage prevention and excellent antibacterial effect and a preparation method thereof, and the PC/ABS alloy has the performances of high shading, high weather resistance, screw post slippage prevention, antibacterial property and the like.
The invention provides a PC/ABS alloy with high shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect, which comprises the following components in parts by weight:
Figure BDA0003080673590000021
the high-shading titanium dioxide master batch comprises the following components in parts by weight:
Figure BDA0003080673590000022
the photocatalyst titanium dioxide master batch is prepared from the following components in parts by weight:
Figure BDA0003080673590000023
further, the PC resin is bisphenol A polycarbonate with the number average molecular weight of 17,000-30,000 g/mol, and the glass transition temperature of the polycarbonate is 145-150 ℃. Specifically, it can be selected from L-1225Y, Dow PC 201-10, Hunan petrochemical PC 1100, PC 1220, Corsia PC 2800, PC 2400, and OD2015, preferably Corsia PC 2400.
Further, the high-shading titanium dioxide is rutile titanium dioxide with the particle size of 200-400 nm, wherein the content of aluminum oxide in the coating film is 3.0-4.0%, and the content of silicon dioxide in the coating film is 3.0-7.0%. Specifically, R-960, R-350 and R-103 of curbital chemistry can be selected. Preferably R-350 of Keveing chemistry, with a particle size of 220nm, an alumina content of 3.2% and a silica content of 3.5%.
Further, the photocatalyst titanium dioxide is rutile titanium dioxide with the particle size of 20-50 nm, wherein the content of alumina in the coating film is 3.0-4.0%, and the content of silicon dioxide isThe content is 3.0-7.0%. Nano TiO of Shanghai Hughu titanium dioxide can be selected2The particle size is 20-30nm, the content of alumina is 3.2%, and the content of silica is 3.5%.
Further, the preparation method of the high shading/photocatalyst titanium dioxide master batch comprises the following steps:
(A) preparing the materials according to the components and the parts by weight, placing the materials in a high-speed mixer, and mixing for 5-20 min to obtain a mixture;
(B) adding the mixture into a double-screw extruder, extruding and pelletizing to obtain the titanium dioxide master batch, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 240-270 ℃.
Further, the SAN resin is a polyacrylonitrile-styrene polymer having a molecular weight of 100,000-200,000g/mol and AN Acrylonitrile (AN) content of 32-37%. D-168 of Zhenjiangqimei is preferable, the molecular weight is 130000g/mol, and the AN content is 35%.
Further, the toughening agent is styrene-butadiene-acrylonitrile copolymer, polyurethane elastomer, ethylene-methyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, polyolefin elastomer, silicon rubber with a core-shell structure or methyl methacrylate-butadiene-styrene terpolymer. The styrene-butadiene-acrylonitrile copolymer is preferably selected, and specifically, HR181 high rubber powder of Korea Jinhu can be selected, wherein the butadiene content is 50-60%.
Further, the dispersing agent is one or more than two of silicone master batch, Pentaerythritol Ester (PETS) and ethylene distearamide; preferably Dow silicone master batch MB50-315, silicone active ingredient 50%, master batch carrier PC.
Further, the antioxidant is one or two of phosphite antioxidant 168, phosphite antioxidant S-9228, hindered phenol antioxidant 1010, hindered phenol antioxidant 1098 and hindered phenol antioxidant 1076. Specifically, antioxidant 1010, antioxidant 1076, antioxidant 168 produced by Basf company or S-9228 produced by Dover company can be selected; preferably, the antioxidant 1076 and the antioxidant 168 are present in a ratio of 1:1 is compounded and used.
In a preferred embodiment of the present invention, the PC/ABS alloy with high light-shielding, high weather resistance, screw-stud slippage prevention and excellent antibacterial effect is composed of the following components in parts by weight:
Figure BDA0003080673590000031
the high-shading titanium dioxide master batch comprises the following components in parts by weight:
Figure BDA0003080673590000032
Figure BDA0003080673590000041
the photocatalyst titanium dioxide master batch is prepared from the following components in parts by weight:
Figure BDA0003080673590000042
wherein, in the preferred embodiment,
the selected PC resin is PC 2400 created by Coxica;
the selected SAN resin is D-168 of Zhenjiangqimei;
the selected toughening agent is HR181 high-adhesive powder of the Hanjin lake;
the selected high-shading titanium dioxide is R350 of Kebi chemistry;
the selected photocatalyst titanium white is Nano TiO in Shanghai river Shanghai province titanium white chemical industry2；
The dispersing agent selected from the PC/ABS alloy raw material is Dow silicone master batch MB 50-315; the dispersing agent selected in the high shading/photocatalyst titanium dioxide master batch is Pentaerythritol Ester (PETS);
the selected antioxidant is an antioxidant 1076 produced by Basf company and an antioxidant 168 which are compounded for use, and the weight ratio is 1: 1.
In a second aspect of the present invention, there is provided a method for preparing a PC/ABS alloy having high light-shielding, high weather resistance, prevention of screw post thread slipping and excellent antibacterial effect as described above, comprising the steps of:
s1, preparing raw materials according to the weight part ratio, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
The invention has the advantages that:
1. from the optical theory, when an inorganic component is added to a transparent substance, a transparent effect occurs when the size of the inorganic component is less than 1/2 λ (200 nm). If the particle diameter is smaller, the transparency is better, and the hiding ratio is also worse. When the particle diameter exceeds 200nm, the larger the particle diameter, the smaller the specific surface area, and the poorer the hiding ratio. Therefore, the closer the particle size is to 200nm, the better the hiding ratio is. Preferably 200-300nm high-light-shielding titanium dioxide.
2. The surface of the titanium dioxide is specially coated by 3.0-4.0% of alumina and 3.0-7.0% of silicon dioxide, so that the titanium dioxide has more excellent weather resistance.
3. Nano titanium dioxide (Nano TiO) with particle size of 20-50 nm2) Having a strong photocatalytic power in H2O、O2The hydroxyl radical (HO. cndot.) generated by the photocatalytic reaction in the system can react with various bacteria and smelly bodies to effectively sterilize and eliminate the smell, so that the nano TiO material can be prepared into nano TiO2An antibacterial agent. Nano TiO 22The antibacterial agent has the ability to kill and remove bacteria and their debris together, and also to decompose toxins secreted by the bacteria. And nano TiO2The bactericide has the following characteristics: firstly, the effect is good, for example, the effect of silver series antibacterial agent is about 24h, and the nano TiO is2Only 1h or so is needed; second is TiO2Is a semi-permanent maintenanceAntibacterial agents having an antibacterial effect, unlike other antibacterial agents whose effect gradually decreases with the dissolution of the antibacterial agent; thirdly, the safety is good, and the skin contact is not affected. The ultraviolet ray can be scattered by 20-50 nm and absorbed, so that the weather resistance is better.
3. During the process of screwing the screw 10 in and out, the screw column becomes soft and the thread is slippery due to the phenomenon of heat generation. The PC/ABS flexural strength was 2700MPa with D-168 having a high acrylonitrile content. When a screw driving test is carried out, certain rigidity is ensured, so that the phenomenon of tooth slipping is prevented.
4. The PC/ABS alloy material has the performances of high shading, high whiteness, high weather resistance, screw column slippage prevention, excellent antibacterial effect and the like, and can be widely used for parts such as white household appliance shells and the like.
Detailed Description
The following examples and comparative examples will explain the present invention in detail.
In the following examples and comparative examples, the following ingredients were used for each raw material:
PC resin: PC 2400 by kesichun; the molecular weight of PC 2400 was 21,000 g/mol.
SAN resin: d-168 of Zhenjiangqimei, the molecular weight is 130000g/mol, and the AN content is 35%; taiwan Qimei PN-127H, AN content 28%.
A toughening agent: HR181 high rubber powder of Korean Jinhu lake, wherein the butadiene content is 50-60%.
Titanium dioxide: r-960 of Keveing chemical, and the median particle diameter (D50%) is 350 nm; r-350 of Ketonghua, with median particle diameter (D50%) of 220 nm; nano TiO in Shanghai river Shanghai titanium white chemical industry2The median particle diameter (D50%) is 20-30 nm.
Antioxidant: antioxidant 1076 and antioxidant 168 from Basf corporation.
Dispersing agent: pentaerythritol Ester (PETS); dow silicone master batch MB50-315, silicone effective component 50%, master batch carrier is PC.
The high shading titanium dioxide master batch comprises the following components in percentage by weight:
Figure BDA0003080673590000061
the photocatalyst titanium dioxide master batch is prepared from the following components in percentage by weight:
Figure BDA0003080673590000062
TABLE 1 Components and compounding ratios of comparative examples 1-5 and examples 1-3
Figure BDA0003080673590000063
TABLE 2 Components and compounding ratios of examples 4-10
Figure BDA0003080673590000064
Figure BDA0003080673590000071
TABLE 3 Components and proportions of examples 11-12
Formulation (calculated by weight) Example 11 Example 12
PC 2400 55 63
D-168 19 19
PN-117C
EXL2620 15 15
Antioxidant 1076 0.2 0.2
Antioxidant 168 0.2 0.2
MB50-315 0.6 0.6
Titanium white R-350
Titanium dioxide R-960
Nano TiO2
High-shading titanium dioxide master batch 20
Photocatalyst titanium dioxide master batch 4
Comparative example 1:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Comparative example 2:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Comparative example 3:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Comparative example 4:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 1:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 2:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and granulating to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 3:
s1, preparing raw materials according to the weight part ratio in the table 1, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 4:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 5:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 6:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 7:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 8:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 9:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 10:
s1, preparing raw materials according to the weight part ratio shown in the table 2, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 11:
s1, preparing raw materials according to the weight part ratio shown in the table 3, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 12:
s1, preparing raw materials according to the weight part ratio shown in the table 3, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and granulating to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
Example 13: evaluation of the effects of the implementations
The samples obtained in comparative examples 1 to 5 and examples 1 to 12 were tested for product performance by the following methods:
bending strength: according to ISO 178, the experimental speed is 2 mm/min;
impact strength of the simply supported beam notch: according to ISO 179;
transmittance: the test was carried out according to ISO 13468-1 using a 1.0mm flat panel template;
weather resistance: weather resistance was evaluated with Δ E according to SAE J2527 for 300 h;
the screw column performance: the tapping screw of M3 was used, and the inner diameter of the plastic screw hole was 2.6 mm. Continuously carrying out a 10-in 10-out screwing experiment by using 5N torsion, and observing whether the screw column has the phenomena of tooth sliding and cracking;
the antibacterial effect is as follows: detection was carried out according to JIS Z2801; when the antibacterial activity value (R) of the Escherichia coli ATCC 8739 and the Staphylococcus aureus ATCC 6538 is tested to be more than or equal to 2.0, the antibacterial effect is shown, and the larger the value is, the better the antibacterial effect is.
TABLE 4 test results of comparative examples 1 to 5 and examples 1 to 3
Figure BDA0003080673590000111
Figure BDA0003080673590000121
TABLE 5 test results for examples 4-10
Figure BDA0003080673590000122
TABLE 6 test results for examples 11-12
Figure BDA0003080673590000123
Figure BDA0003080673590000131
As can be seen from comparative examples 1-5, the bending modulus can be rapidly improved along with the increase of the addition of the titanium dioxide R-960, so that the poor smooth teeth during screwing are gradually improved; however, the more the titanium dioxide is added, the greater the impact performance is, and when the notch impact strength is lower than 30, the poor cracking can occur during screwing. In addition, since titanium dioxide has good covering property, the higher the addition amount is, the better the light-shielding degree and weather resistance are.
As can be seen from comparative examples 2 to 5 and examples 1 to 4, the titanium dioxide R-350 has lower light transmittance and better weather resistance, because the median particle size of R-350 is 220nm, the median particle size of R-960 is 350nm, and when the particle size of the titanium dioxide is not less than 200nm, the smaller the particle size, the larger the specific surface area of the titanium dioxide is, so that the titanium dioxide has better coverage rate and lower light transmittance and weather resistance.
As can be seen from examples 5 to 7, TiO attached to Nano2The addition amount of the Nano TiO compound is increased, so that the weather resistance and the antibacterial property are obviously improved, and on one hand, the Nano TiO compound is prepared from Nano TiO with the size of 20-50 nm2The ultraviolet light can be scattered and absorbed, so that the weather resistance is better; on the other hand, 20-50 nm of Nano TiO2Has strong light catalytic ability, so has good antibacterial effect. However, TiO because of Nano2Has a particle size of less than 200nm, so that the effect of reducing light transmittance is small.
As can be seen from examples 3, 8 and 9, R-350 having a median particle diameter of 220nm and Nano TiO having a median particle diameter of 20 to 50nm were used2The compound addition of the (B) has more excellent performances on light shading degree, weather resistance and antibacterial performance. If the titanium dioxide is prepared into titanium dioxide master batch in advance, and then extrusion granulation is carried out, the titanium dioxide has good dispersibility, and the phenomenon of titanium dioxide agglomeration is prevented, so that the covering property and the weather-resistant effect are further improved. From the embodiments 10 to 12, it can be seen that the use of the high-shading titanium dioxide master batches or the photocatalyst titanium dioxide master batches in a compounding manner has a better effect than the use of the high-shading titanium dioxide master batches or the photocatalyst titanium dioxide master batches which are added separately, and the high-shading titanium dioxide master batches or the photocatalyst titanium dioxide master batches which are used separately cannot meet the standard requirements.
It can be seen from examples 9 and 10 that the use of D-168 with a higher AN content has better protection against the problem of screw post thread slippage than PN-127H. Example 10 is the best case.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the appended claims is to be accorded the full range of equivalents.

Claims (3)

1. A PC/ABS alloy with high shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect is characterized by comprising the following components in parts by weight:
Figure FDA0003556291900000011
the high-shading titanium dioxide master batch comprises the following components in parts by weight:
Figure FDA0003556291900000012
the photocatalyst titanium dioxide master batch is prepared from the following components in parts by weight:
Figure FDA0003556291900000013
wherein, the selected PC resin is bisphenol A polycarbonate with the molecular weight of 21,000 g/mol;
the molecular weight of the selected SAN resin is 130000g/mol, and the AN content is 35 percent;
the selected toughening agent is HR181 high-rubber powder with 50-60% of butadiene content;
the selected high-shading titanium dioxide is rutile type titanium dioxide with the median particle size of 220 nm;
the photocatalyst titanium dioxide is rutile titanium dioxide with the median particle size of 20-30 nm;
the dispersing agent selected from the PC/ABS alloy raw material is silicone master batch MB50-315, and the silicone effective component is 50%; the dispersing agent selected in the high shading/photocatalyst titanium dioxide master batch is pentaerythritol ester;
the selected antioxidant is compounded by antioxidant 1076 and antioxidant 168 with the weight ratio of 1: 1.
2. The PC/ABS alloy with high shading, high weather resistance, screw post slippage prevention and excellent antibacterial effect according to claim 1, wherein the preparation method of the high shading/photocatalyst titanium dioxide master batch comprises the following steps:
(A) preparing the materials according to the components and the parts by weight, placing the materials in a high-speed mixer, and mixing for 5-20 min to obtain a mixture;
(B) adding the mixture into a double-screw extruder, extruding and pelletizing to obtain the titanium dioxide master batch, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 240-270 ℃.
3. A method for preparing the PC/ABS alloy of high light-shielding, high weather-resistance, screw-stud-slippage-prevention and excellent antibacterial effect according to claim 1 or 2, comprising the steps of:
s1, preparing raw materials according to the weight part ratio, putting the raw materials into a premixer to uniformly mix the raw materials, heating the raw materials to 60 ℃, and then preserving the heat for 15 minutes to obtain a premix;
s2, adding the premix obtained in the step S1 into a double-screw extruder, extruding and pelletizing to obtain the PC/ABS composite material, wherein the rotating speed of a charging barrel of the double-screw extruder is 15-35rpm, and the temperature of the charging barrel is 220-;
s3, injection molding the PC/ABS composite material prepared in the step S2 to obtain a finished product.
CN202110565857.8A 2021-05-24 2021-05-24 PC/ABS alloy with high shading, high weather resistance, screw column slippage prevention and excellent antibacterial effect and preparation method thereof Active CN113174127B (en)

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