CN111607210A - PC flame-retardant composite material for household appliances and preparation method thereof - Google Patents
PC flame-retardant composite material for household appliances and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of household appliance materials, and particularly discloses a PC flame-retardant composite material for household appliances, which is prepared from the following raw materials in parts by weight: 61.9-76.6% of PC, 8-12% of glass fiber, 0.1-2% of light shielding agent, 0.3-0.5% of flame retardant, 0.2-0.8% of toughening agent, 5-10% of antioxidant, 0.3-0.8% of light stabilizer, 0.5-2.0% of coupling agent and 4-15% of insulating agent; the light shielding agent is organic modified nano rutile titanium dioxide; the PC composite material for the household appliance has the advantage of good light shielding performance; the preparation method of the PC composite material for the household appliance is also provided, and the titanium dioxide in the raw material can be uniformly dispersed in the PC composite material for the household appliance, so that the light shielding property of the PC composite material for the household appliance is improved.
Description
Technical Field
The invention relates to the technical field of household appliance materials, in particular to a PC flame-retardant composite material for household appliances and a preparation method thereof.
Background
Polycarbonate (PC) is an engineering plastic with excellent comprehensive performance, is one of general engineering plastics with the fastest growth speed in recent years, and has the advantages of excellent impact toughness, dimensional stability, electrical insulation, weather resistance, no toxicity and the like. Based on the excellent performance of PC materials, PC materials are widely applied to a plurality of fields such as household appliances, automobiles, office equipment, medical care and the like. In the production of PC materials for household appliances, other auxiliary materials such as glass fibers, light shielding agents, insulating agents and the like are often required to be added, so that the requirements of various performance indexes required in actual production are met.
Titanium dioxide, as an inorganic ultraviolet light screening agent and an absorbent with excellent performance, not only can scatter ultraviolet light entering the material, but also can effectively absorb ultraviolet light energy through electronic transition, and has been widely applied to the field of ultraviolet light aging resistance modification of high polymer materials. And the nano titanium dioxide can increase the contact area with ultraviolet light based on the larger surface area of the nano titanium dioxide, so that the light shielding property of the nano titanium dioxide is greatly improved. And the rutile type nano titanium dioxide with the most stable crystal form in the nano titanium dioxide is also gradually applied.
Conventionally, titanium dioxide has been added to PC composite materials for home appliances to improve light-shielding properties of the PC composite materials for home appliances. For example, chinese patent publication No. CN103408914B discloses a modified PC composite material for home appliances and a preparation method thereof, wherein the formula of the modified PC composite material for home appliances comprises: PC: 78 parts and MBS: 7 parts of titanium dioxide: 5 parts of glass fiber: 8 parts of halogen-free flame retardant FR-2025: 0.2 part of anti-dripping agent PTFE: 0.3 part of antioxidant 1076: 0.2 part of light stabilizer 770: 0.2 part of coupling agent PETS: 0.8 part. The preparation method of the modified PC composite material of the household appliance comprises the following steps: (1) firstly, putting PC into an oven to be dried for 240 minutes at 120 ℃, then adding the PC, MBS and TiO2 into a high-speed mixer according to the specified mass parts for mixing, uniformly stirring, adding the specified mass parts of flame retardant, anti-dripping agent, antioxidant, light stabilizer and coupling agent, and uniformly mixing; (2) adding the materials into a double-screw extruder, and adding the treated glass fiber at a glass fiber port in the extrusion process to extrude; wherein, the temperature of each area of the double-screw extruder is as follows: 210-215 ℃; and (2) second stage: 230 ℃ to 245 ℃; and (3) three stages: 240 ℃ and 255 ℃; 220 ℃ and 230 ℃ of the machine head; and cooling the extruded material strips to room temperature through a water tank, and granulating through a granulator.
By the above process, a PC composite material for home appliances having improved light-shielding properties can be prepared. However, the above process has the following defects due to the influence of the properties of titanium dioxide: the titanium dioxide is affected by the preparation method, and the surface of the particles of the titanium dioxide is provided with a large number of hydroxyl groups and shows hydrophilicity, so that the titanium dioxide is easy to agglomerate and phase separate in the PC composite material for the household appliance, and the light shielding property of each part of the PC composite material for the household appliance is not uniform.
Disclosure of Invention
In view of the defects of the prior art, the first object of the present invention is to provide a PC flame retardant composite material for a home appliance, which can uniformly distribute nano titanium dioxide in raw materials, thereby improving the uniformity of light shielding property of the PC composite material for a home appliance.
The second purpose of the invention is to provide a preparation method of the PC flame-retardant composite material for the household appliances.
In order to achieve the first object, the invention provides the following technical scheme:
a PC flame-retardant composite material for household appliances is prepared from the following raw materials in parts by weight: 61.9-76.6% of PC, 8-12% of glass fiber, 0.1-2% of light shielding agent, 0.3-0.5% of flame retardant, 0.2-0.8% of toughening agent, 5-10% of antioxidant, 0.3-0.8% of light stabilizer, 0.5-2.0% of coupling agent and 4-15% of insulating agent; the light shielding agent is organic modified nano rutile type titanium dioxide.
By adopting the technical scheme, the surface of the titanium dioxide is provided with a large number of hydroxyl groups which are hydrophilic, and the titanium dioxide is easy to agglomerate in the PC flame-retardant composite material for the household appliances, so that the distribution of the flame-retardant composite material is uneven; the invention adopts the organic modified nano rutile type titanium dioxide, the surface of the nano rutile type titanium dioxide is organically modified, so that the original hydrophilicity of the nano rutile type titanium dioxide is changed into hydrophobicity, and the organic modified nano rutile type titanium dioxide can be uniformly distributed in the PC flame-retardant composite material for the household appliance according to the similar intermiscibility principle, so that the light shielding property of the PC flame-retardant composite material for the household appliance is improved and is relatively uniform.
Preferably, the raw materials comprise, by weight, PC64-68%, glass fiber 10-11%, organic modified nano rutile titanium dioxide 0.7-1%, flame retardant 0.3-0.4%, toughening agent 0.3-0.5%, antioxidant 7-9%, light stabilizer 0.5-0.6%, and coupling agent 1-1.7%; 10-14% of insulating agent.
By adopting the technical scheme, when the addition amount of the organic modified nano rutile type titanium dioxide is within the range of 0.7-1%, the light shielding property of the PC flame-retardant composite material for the household appliance is the best, and when the addition amount of the organic modified nano rutile type titanium dioxide is more than 1%, the light shielding property of the corresponding PC flame-retardant composite material for the household appliance is not obviously increased.
Preferably, the organic modified nano rutile titanium dioxide is silane coupling agent A151 modified nano rutile titanium dioxide.
By adopting the technical scheme, the silane coupling agent A151 reacts with hydroxyl on the surface of the nano rutile type titanium dioxide through a covalent bond, so that the organic modification of the nano rutile type titanium dioxide is realized.
Preferably, the silane coupling agent A151 modified nano rutile type titanium dioxide is prepared by the following steps: 1) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2-5 mol/L;
2) dropwise adding the tetrabutyl titanate solution obtained in the step 1) into 3-5mol/L nitric acid solution at the speed of 150-200 mL/hour, stirring while dropwise adding, and reacting for 4-6h after dropwise adding to obtain a suspension A, wherein the volume ratio of the dropwise added tetrabutyl titanate solution to the nitric acid solution is 1:1-1: 3;
3) adjusting the pH of the suspension A to 2-3 by adding ammonia water into the suspension A obtained in the step 2), and then adding absolute ethyl alcohol with the volume 7-10 times that of the suspension A to obtain a mixed solution B;
4) dripping a silane coupling agent A-151 into the mixed solution B obtained in the step 3) at the speed of 150-200mL, wherein the ratio of the amount of the dripped silane coupling agent A-151 to the solid content of tetrabutyl titanate in the tetrabutyl titanate solution is 1:1, stirring while dripping, continuing to stir for reaction for 2-3h after finishing dripping, and then centrifuging to obtain a precipitate A;
5) and washing the precipitate A, and then drying to obtain the silane coupling agent A151 modified nano rutile type titanium dioxide.
By adopting the technical scheme, tetrabutyl titanate solution is dripped under acidic conditions, tetrabutyl titanate is hydrolyzed under acidic conditions to form rutile titanium dioxide, then silane coupling agent A-151 is added into suspension of the nano rutile titanium dioxide, and the silane coupling agent A-151 can react with hydroxyl on the surface of the nano rutile titanium dioxide to modify the nano rutile titanium dioxide.
Preferably, the precipitate A in the step 5) is washed with deionized water for 2-3 times, then washed with absolute ethyl alcohol for 2-3 times, and then dried at 50-70 ℃ to obtain the silane coupling agent A151 modified nano rutile titanium dioxide.
By adopting the above scheme, through washing with ethanol, deionized water can be replaced, and then absolute ethyl alcohol is dried, so that the absolute ethyl alcohol is easier to dry than water, and the drying time can be saved.
Preferably, the reaction temperature in the step 2) is 45-60 ℃.
By adopting the scheme, when the temperature is too low, the reaction speed is too slow, and when the temperature is too high, the nitric acid is decomposed too fast, so that the maintenance of acidic conditions is not facilitated, and the waste of the nitric acid is caused.
The second purpose of the invention is to provide a preparation method of a PC flame-retardant composite material for household appliances, which comprises the following steps:
1) uniformly mixing PC, glass fiber, a light shielding agent, a flame retardant, a toughening agent, an antioxidant, a light stabilizer, a coupling agent and an insulating agent to form a mixture A;
2) and (2) melting, mixing, extruding, cooling and granulating the mixture A in the step 1) at the temperature of 260-280 ℃ to obtain the PC composite material for the household appliances.
By adopting the technical scheme, the PC flame-retardant composite material for the household appliance is prepared by uniformly mixing the raw materials, melting, mixing, extruding, cooling and granulating the uniformly mixed mixture A.
Preferably, the glass fibers are pretreated in step 1) as follows:
the method comprises the steps of preparing a coupling agent solution by taking absolute ethyl alcohol as a solvent, wherein the volume ratio of the absolute ethyl alcohol to the coupling agent is 1:1, then placing glass fibers in the prepared coupling agent solution, soaking for 1h, wherein the mass ratio of the glass fibers to the coupling agent is 98:2, and then drying at 100 ℃.
By adopting the technical scheme, the glass fiber can be pretreated to carry the coupling agent on the surface of the glass fiber, so that the glass fiber is easily dispersed in the PC flame-retardant composite material.
In conclusion, the invention has the following beneficial effects:
(1) the PC flame-retardant composite material for the household appliances, which is prepared by adding the silane coupling agent A151 modified rutile type nano titanium dioxide, has good light shielding property; when the solid content of the titanium dioxide in the added silane coupling agent A151 modified rutile type nano titanium dioxide is 80.1%, the light shielding property of the corresponding PC flame-retardant composite material for the household appliances can reach 6.6%, compared with the prior art, the addition amount of the titanium dioxide is reduced, and the light shielding property is obviously improved.
(2) The light shielding agent adopted by the invention has an increasing trend of light shielding property with increasing addition amount, but when the addition amount reaches more than 1%, the light shielding property of the corresponding PC composite material for the household appliances is not obviously increased, the light shielding effect is optimal when the addition amount of the light shielding agent is 1%, and the light shielding agent is uniformly distributed in the PC composite material for the household appliances, so that the light shielding property of each part of the PC composite material for the household appliances is relatively uniform, and the quality of the PC composite material for the household appliances is favorably improved.
(3) The method is characterized in that tetrabutyl titanate solution is dripped under acidic conditions, tetrabutyl titanate is hydrolyzed under acidic conditions to form rutile titanium dioxide, and a silane coupling agent A151 is directly added into a rutile titanium dioxide suspension formed after hydrolysis for modification, so that the steps of separating and redispersing the rutile titanium dioxide and a dispersing agent for modification can be reduced, and the preparation time is greatly reduced.
Detailed Description
The present invention will be described in further detail with reference to examples.
Raw materials
The light shielding agent adopts organic modified rutile type nano titanium dioxide, and the rutile type nano titanium dioxide is modified by a silane coupling agent A151, and the preparation steps are shown as preparation examples 1-3; the flame retardant is FR-2025 selected from Aster-Productus-Chemicals Co., Ltd; a toughening agent TFL-205H selected from Nanjing Foster chemical Co., Ltd; the antioxidant adopts an antioxidant 1076 selected from Shanghai Kayin chemical industry; the light stabilizer is 770 selected from Shanghai Kahn chemical industry; the coupling agent adopts KH560 and is selected from caruncle morning light chemical industry Co.Ltd; the insulating agent is polytetrafluoroethylene and is selected from Yonggong sealing element Limited.
Preparation example 1
The preparation of the organic modified rutile type nano titanium dioxide, namely the silane coupling agent A151 modified rutile type nano titanium dioxide:
1) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2 mol/L;
2) dropwise adding the tetrabutyl titanate solution obtained in the step 1) into a nitric acid solution with the concentration of 3mol/L at the speed of 150mL per hour, stirring while dropwise adding, and stirring for reacting for 4 hours after dropwise adding to obtain a suspension A, wherein the volume ratio of the tetrabutyl titanate solution to the nitric acid solution is 1:1, and the reaction temperature is 45 ℃;
3) adding 25% by mass concentrated ammonia water into the suspension A in the step 2) to adjust the pH of the suspension A to 2, and then adding absolute ethyl alcohol with the volume 7 times that of the suspension A to obtain a mixed solution B;
4) dropwise adding a silane coupling agent A-151 into the mixed solution B obtained in the step 3) at a speed of 150mL, wherein the mass ratio of the silane coupling agent A-151 to tetrabutyl titanate in a tetrabutyl titanate solution is 1:1, stirring while dropwise adding, after dropwise adding, continuously stirring for reacting for 2h, and centrifuging for 5min at the rotating speed of 4000r/min to obtain a precipitate A;
5) and washing the precipitate A with deionized water and absolute ethyl alcohol for 3 times in sequence, and drying at 50 ℃ to obtain the organic modified rutile type nano titanium dioxide, namely the silane coupling agent A151 modified rutile type nano titanium dioxide.
Preparation example 2
The preparation of the organic modified rutile type nano titanium dioxide, namely the silane coupling agent A151 modified rutile type nano titanium dioxide:
1) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2.5 mol/L;
2) dropwise adding the tetrabutyl titanate solution obtained in the step 1) into a nitric acid solution with the concentration of 4mol/L at the speed of 170mL per hour, stirring while dropwise adding, and stirring to react for 6 hours after dropwise adding to obtain a suspension A, wherein the volume ratio of the tetrabutyl titanate solution to the nitric acid solution is 1:2, and the reaction temperature is 50 ℃;
3) adding 25% by mass concentrated ammonia water into the suspension A in the step 2) to adjust the pH of the suspension A to 2.5, and then adding absolute ethyl alcohol with the volume 8.5 times of that of the suspension A to obtain a mixed solution B;
4) dripping a silane coupling agent A-151 into the mixed solution B obtained in the step 3) at a speed of 170mL, wherein the mass ratio of the silane coupling agent A-151 to tetrabutyl titanate in the tetrabutyl titanate solution is 1:1, stirring while dripping, continuously stirring for reacting for 2.5h after finishing dripping, and centrifuging for 5min at a rotating speed of 5000r/min to obtain a precipitate A;
5) and washing the precipitate A with deionized water and absolute ethyl alcohol for 3 times in sequence, and drying at 60 ℃ to obtain the organic modified rutile type nano titanium dioxide, namely the silane coupling agent A151 modified rutile type nano titanium dioxide.
Preparation example 3
The preparation of the organic modified rutile type nano titanium dioxide, namely the silane coupling agent A151 modified rutile type nano titanium dioxide:
1) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 5 mol/L;
2) dropwise adding the tetrabutyl titanate solution obtained in the step 1) into a nitric acid solution with the concentration of 5mol/L at the speed of 200mL per hour, stirring while dropwise adding, and stirring for reacting for 5 hours after dropwise adding to obtain a suspension A, wherein the volume ratio of the tetrabutyl titanate solution to the nitric acid solution is 1:3, and the reaction temperature is 60 ℃;
3) adding 25% by mass concentrated ammonia water into the suspension A in the step 2) to adjust the pH of the suspension A to 3, and then adding 10 times of anhydrous ethanol by volume of the suspension A to obtain a mixed solution B;
4) dripping a silane coupling agent A-151 into the mixed solution B obtained in the step 3) at a speed of 200mL, wherein the mass ratio of the silane coupling agent A-151 to tetrabutyl titanate in the tetrabutyl titanate solution is 1:1, stirring while dripping, continuously stirring for reacting for 3h after finishing dripping, and centrifuging for 5min at a rotating speed of 6000r/min to obtain a precipitate A;
5) and washing the precipitate A with deionized water and absolute ethyl alcohol for 2 times in sequence, and drying at 70 ℃ to obtain the organic modified rutile type nano titanium dioxide, namely the silane coupling agent A151 modified rutile type nano titanium dioxide.
The solid content of titanium dioxide in the silane coupling agent A151 modified rutile type nano titanium dioxide is 80.1 percent, and the determination method comprises the following steps:
1) calcining the silane coupling agent A151 modified rutile type nano titanium dioxide at 240 ℃ for 2 h;
2) the calcined mass of the silane coupling agent A151 modified rutile type nano titanium dioxide is the solid content of titanium dioxide in the silane coupling agent A151 modified rutile type nano titanium dioxide;
pretreatment of glass fibers:
using absolute ethyl alcohol as a solvent to prepare a coupling agent solution, wherein the coupling agent adopts KH560, the volume ratio of the absolute ethyl alcohol to a silane coupling agent is 1:1, then placing glass fibers in the prepared silane coupling agent solution to be soaked for 1h, the mass ratio of the glass fibers to the coupling agent is 98:2, and then drying the glass fibers at 100 ℃ for 5 h.
Example 1
The PC flame-retardant composite material for the household appliances is characterized in that the content of each component in example 1 is shown in Table 1, and the preparation steps of example 1 are as follows:
1) uniformly mixing PC, glass fiber, a light shielding agent, a flame retardant, a toughening agent, an antioxidant, a light stabilizer, a coupling agent and an insulating agent to form a mixture A, wherein the light shielding agent is the organic modified rutile type nano titanium dioxide in preparation example 1;
2) adding the mixture A obtained in the step 1) into a double-screw extruder, and carrying out melt mixing extrusion, cooling and granulation at 260 ℃ to obtain the PC composite material for the household appliances.
Example 2
A PC flame-retardant composite material for household appliances, wherein the content of each component of an embodiment 2 is shown in Table 1, an organic modified rutile type nano titanium dioxide in a preparation example 2 is adopted as a light shielding agent, and the preparation step of the embodiment 2 is different from that of the embodiment 1 in that the melting temperature of a mixture A is 270 ℃.
Example 3
A PC flame-retardant composite material for household appliances, wherein the content of each component of an embodiment 3 is shown in Table 1, an organic modified rutile type nano titanium dioxide in the preparation embodiment 3 is adopted as a light shielding agent, and the preparation step of the embodiment 3 is different from that of the embodiment 1 in that the melting temperature of a mixture A is 280 ℃.
Example 4
A PC flame-retardant composite material for household appliances, wherein the content of each component of example 4 is shown in Table 1, the light-shielding agent adopts the organic modified rutile type nano titanium dioxide in preparation example 2, and the preparation step of example 4 is different from that of example 1 in that the melting temperature of a mixture A is 275 ℃.
Example 5
A PC flame-retardant composite material for household appliances, wherein the content of each component of example 5 is shown in Table 1, the light-shielding agent adopts the organic modified rutile type nano titanium dioxide in preparation example 3, and the preparation step of example 5 is different from that of example 1 in that the melting temperature of a mixture A is 270 ℃.
Examples 6 to 9
A PC flame-retardant composite material for household appliances, wherein the contents of the components of the examples 6 to 9 are shown in Table 1, the light-shielding agent adopts the organic modified rutile type nano titanium dioxide in the preparation example 2, and the preparation steps of the examples 6 to 9 are the same as those of the example 4.
TABLE 1 composition and content of raw materials of PC flame-retardant composite materials for home appliances in examples 1 to 9
Comparative example 1
The PC flame retardant composite material for home appliances of comparative example 1, whose respective component contents are as shown in example 4, is different from that of example 4 in that the silane coupling agent a151 modified nano-rutile type titanium dioxide is replaced with the silane coupling agent a151, and the amount of the silane coupling agent a151 is the same as the amount of the added organic modified nano-rutile type titanium dioxide. The procedure of the working procedure of comparative example 1 was the same as in example 4.
Comparative example 2
The PC flame retardant composite material for home appliances of comparative example 3 has the component contents as shown in example 4, and is different from those of example 4 in that the silane coupling agent a151 modified nano-rutile type titanium dioxide is replaced with nano-rutile type titanium dioxide in the same amount as the solid content of titanium dioxide in the added organic modified nano-rutile type titanium dioxide. The procedure of the working procedure of comparative example 3 was the same as in example 4.
Comparative example 3
The PC flame retardant composite material for home appliances of comparative example 2 has the respective component contents as shown in example 4, and is different from those of example 4 in that the silane coupling agent a151 modified nano rutile type titanium dioxide is added in an amount of 0. The procedure of the working procedure of comparative example 2 was the same as in example 4.
Comparative example 4
The PC flame-retardant composite material for the household appliance of example 3 in the Chinese patent with the publication number of CN 103408914B.
Performance test
The PC flame-retardant composites for home appliances in examples 1 to 9 and comparative examples 1 to 4 were sampled, respectively, and the following tests were performed, the test data of which are shown in Table 2.
Tensile strength: testing was performed according to ASTM/D638.
Bending strength: the test was performed according to ASTM/D790.
Elongation at break: testing was performed according to ASTM/D638.
Notched izod impact strength: ASTM/D256 performs the test.
Light transmittance: the test was carried out according to the method in GB 2140-80.
TABLE 2 test results of PC flame retardant composites for household appliances in examples 1 to 9 and comparative examples 1 to 4
As can be seen from the data in Table 2, the PC flame-retardant composite material for household appliances prepared by adding the silane coupling agent A151 modified nano rutile type titanium dioxide has greatly improved light shielding property compared with the PC flame-retardant composite material for household appliances prepared by adding the titanium dioxide in the comparative example 4. And after the titanium dioxide added in the comparative example 4 reaches 4%, the light shielding property is 30%, the solid content of the titanium dioxide in the silane coupling agent A151 modified nano rutile type titanium dioxide added in the invention is 80.1%, and when the addition amount of the silane coupling agent A151 modified nano rutile type titanium dioxide is 1%, the light shielding property reaches 6%. And the PC flame-retardant composite material for the household appliances prepared by adding the silane coupling agent A151 modified nano rutile type titanium dioxide has qualified tensile strength, bending strength, elongation at break, cantilever beam notch impact strength and the like.
From the data of example 1 and example 6, it can be seen that the addition of the silane coupling agent a151 modified nano rutile titanium dioxide in preparation example 1 and preparation example 2, respectively, makes no significant difference in light shielding properties of the corresponding PC flame retardant composite materials for household appliances; from the data of example 3 and example 8, it can be seen that the addition of the silane coupling agent a151 modified nano rutile titanium dioxide in preparation example 3 and preparation example 2, respectively, does not make a significant difference in light shielding property between the corresponding PC flame retardant composite materials for home appliances. It is shown that the silane coupling agent A151 modified nano rutile type titanium dioxide obtained in preparation examples 1-3 has no obvious difference in properties.
From the data of example 4 and examples 6 to 9, it can be seen that as the amount of the silane coupling agent a151 modified nano rutile titanium dioxide added increases, the light-shielding property of the corresponding PC flame retardant composite material for home appliances tends to increase. From the data of example 4 and example 9, it is seen that the light shielding property of the corresponding PC flame retardant composite material for household appliances is improved without significant increase after the amount of the added silane coupling agent a151 modified nano rutile titanium dioxide reaches 1%.
From the data of comparative example 1 and comparative example 3, the silane coupling agent a151 had no significant effect on the light-shielding property of the PC flame-retardant composite material for home appliances. As can be seen from the data of comparative examples 2 and 3, the nano rutile type titanium dioxide is a main factor affecting the light shielding property of the PC flame retardant composite for home appliances. From the data of example 4 and comparative example 2, it can be seen that the light shielding property of the PC flame retardant composite material for home appliances prepared by adding the silane coupling agent a151 modified nano rutile titanium dioxide is significantly improved as compared to the nano rutile titanium dioxide. Thus, it is demonstrated that the improvement of the light shielding property of the PC flame-retardant composite material for home appliances of the present invention is due to the uniform distribution of titanium dioxide inside the PC flame-retardant composite material for home appliances, regardless of the silane coupling agent A151 in the silane coupling agent A151-modified nano rutile titanium dioxide.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (8)
1. The PC flame-retardant composite material for the household appliances is characterized by being prepared from the following raw materials in parts by weight: 61.9-76.6% of PC, 8-12% of glass fiber, 0.1-2% of light shielding agent, 0.3-0.5% of flame retardant, 0.2-0.8% of toughening agent, 5-10% of antioxidant, 0.3-0.8% of light stabilizer, 0.5-2.0% of coupling agent and 4-15% of insulating agent;
the light shielding agent is organic modified nano rutile type titanium dioxide.
2. The PC flame-retardant composite material for the household appliances according to claim 1, wherein the raw materials comprise, by weight, PC64-68%, glass fibers 10-11%, organic modified nano rutile titanium dioxide 0.7-1%, a flame retardant 0.3-0.4%, a toughening agent 0.3-0.5%, an antioxidant 7-9%, a light stabilizer 0.5-0.6%, and a coupling agent 1-1.7%; 10-14% of insulating agent.
3. The PC flame-retardant composite material for the household appliances according to claim 1, wherein the organic modified nano-rutile titanium dioxide is silane coupling agent A151 modified nano-rutile titanium dioxide.
4. The PC flame-retardant composite material for the household appliances according to claim 3, wherein the silane coupling agent A151 modified nano rutile type titanium dioxide is prepared by the following steps:
1) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2-5 mol/L;
2) dropwise adding the tetrabutyl titanate solution obtained in the step 1) into 3-5mol/L nitric acid solution at the speed of 150-200 mL/hour, stirring while dropwise adding, and reacting for 4-6h after dropwise adding to obtain a suspension A, wherein the volume ratio of the dropwise added tetrabutyl titanate solution to the nitric acid solution is 1:1-1: 3;
3) adjusting the pH of the suspension A to 2-3 by adding ammonia water into the suspension A obtained in the step 2), and then adding absolute ethyl alcohol with the volume 7-10 times that of the suspension A to obtain a mixed solution B;
4) dripping a silane coupling agent A-151 into the mixed solution B obtained in the step 3) at the speed of 150-200mL, wherein the mass ratio of the dripped silane coupling agent A-151 to tetrabutyl titanate in the tetrabutyl titanate solution is 1:1, stirring while dripping, continuing to stir for reaction for 2-3h after finishing dripping, and then centrifuging to obtain a precipitate A;
5) and washing the precipitate A, and then drying to obtain the silane coupling agent A151 modified nano rutile type titanium dioxide.
5. The PC flame-retardant composite material for the household appliances as claimed in claim 4, wherein the precipitate A obtained in the step 5) is washed with deionized water for 2-3 times, then washed with absolute ethyl alcohol for 2-3 times, and then dried at 50-70 ℃ to obtain the silane coupling agent A151 modified nano rutile titanium dioxide.
6. The PC flame retardant composite material for household appliances according to claim 4, wherein the reaction temperature in the step 2) is 45-60 ℃.
7. A method for preparing a PC composite material for home appliances according to any one of claims 1 to 6, characterized in that it comprises the steps of:
1) uniformly mixing PC, glass fiber, a light shielding agent, a flame retardant, a toughening agent, an antioxidant, a light stabilizer, a coupling agent and an insulating agent to form a mixture A;
2) and (2) melting, mixing, extruding, cooling and granulating the mixture A in the step 1) at the temperature of 260-280 ℃ to obtain the PC composite material for the household appliances.
8. The method for preparing a PC composite material for home appliances according to claim 7, wherein the glass fiber is treated as follows in step 1):
the method comprises the steps of preparing a coupling agent solution by taking absolute ethyl alcohol as a solvent, wherein the volume ratio of the absolute ethyl alcohol to the coupling agent is 1:1, then placing glass fibers in the prepared coupling agent solution, soaking for 1h, wherein the mass ratio of the glass fibers to the coupling agent is 98:2, and then drying at 100 ℃.
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