CN114044938B - Anti-short wave ultraviolet stabilizer and preparation method and application thereof - Google Patents
Anti-short wave ultraviolet stabilizer and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses an anti-short wave ultraviolet stabilizer, a preparation method and application thereof. The anti-shortwave ultraviolet light stabilizer comprises the following components in parts by weight: 10 parts of bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, 5-20 parts of ultraviolet absorber, 5-20 parts of free radical scavenger and 5-20 parts of light shielding agent. The invention utilizes the compound synergy of the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, the ultraviolet absorber, the free radical capturing agent and the light shielding agent to obtain the anti-short wave ultraviolet light stabilizer with excellent light stabilizing effect on short wave ultraviolet light. The polypropylene composition containing the short-wave ultraviolet light resistant stabilizer has good weather resistance for short-wave ultraviolet light and is not easy to age and change color. In the case where the polypropylene composition further contains a zinc-based antibacterial agent and a scratch resistant agent, the polypropylene composition has more excellent antibacterial effect and scratch resistant effect.
Description
Technical Field
The invention belongs to the technical field of light stabilizers, and particularly relates to a stabilizer for resisting short-wave ultraviolet light, a preparation method and application thereof.
Background
With the rapid development of the automobile industry, the cleaning requirements of automobile interiors are increasing, especially for shared automobiles. Because the space inside the automobile is relatively closed, how to realize the antibiosis of the automobile interior is a technical problem to be solved; and the number of the contact persons sharing the automobile is large, the mobility is high, and the concentrated cleaning and sterilization can not be realized in time.
In the prior art CN210792976U, it has been reported that an atmosphere lamp having a sterilizing function is installed inside an automobile, and active sterilization of an interior of the automobile is achieved by irradiation of an ultraviolet lamp. As the ultraviolet ray has the best sterilization effect at 253.7nm, the ultraviolet wavelength emitted by the common ultraviolet sterilization device in the market is generally 240-280 nm; light stabilizers used in automotive interior materials are mainly resistant to ultraviolet wavelengths (287 to 390 nm) in sunlight and are not effective against radiation and aging of materials by ultraviolet rays having shorter wavelengths. However, the photon energy of the ultraviolet rays with the wavelength of 240-280 nm is higher and reaches 4.43 eV-12.4 eV, the molecular structure of the material is more easily changed and degraded, and the photon energy of the ultraviolet rays with the wavelength of 287-390 nm is only about 3.1 eV-4.4 eV. This results in poor light stability of the automotive interior in the ultraviolet sterilization environment, and is particularly poor in aging resistance, and the automotive interior is extremely prone to aging and discoloration.
Therefore, a light stabilizer with good stability against short-wave ultraviolet with the wavelength of 240-280 nm needs to be developed, so that the automotive interior material has good short-wave ultraviolet aging resistance while being efficiently sterilized by ultraviolet.
Disclosure of Invention
The invention provides the anti-short wave ultraviolet stabilizer for overcoming the defect of poor light stability aiming at short wave ultraviolet in the prior art, and the anti-short wave ultraviolet stabilizer has excellent light stabilizing effect on ultraviolet rays with the wavelength of 240-280 nm.
Another object of the present invention is to provide a polypropylene composition comprising the above stabilizer against short wave ultraviolet light.
It is another object of the present invention to provide a process for preparing the polypropylene composition described above.
Another object of the present invention is the use of the polypropylene composition described above for the preparation of automotive interior materials.
In order to solve the technical problems, the invention adopts the following technical scheme:
the stabilizer for resisting short-wave ultraviolet light comprises the following components in parts by weight:
10 parts of bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, 5-20 parts of ultraviolet absorber, 5-20 parts of free radical scavenger and 5-20 parts of light shielding agent.
The inventor finds out through a large number of experiments that the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, an ultraviolet absorber, a free radical capturing agent and a light shielding agent have excellent light stabilizing effect on short-wavelength ultraviolet rays through synergistic effect.
Wherein bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, also known as antioxidant 852, is usually used as an auxiliary antioxidant in combination with hindered phenol antioxidants. The inventor researches and discovers that under the condition of compounding the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite with an ultraviolet absorber, a free radical capturing agent and a light shielding agent, not only can the hydroperoxide be decomposed, but also the conjugation effect provided by the special benzene ring structure can adjust the energy sensitivity range of opening the chelate ring in the molecular structure to 240-280 nm, and the molecular structure change caused by short wave ultraviolet is converted into heat energy, so that the degradation of the polypropylene material is avoided. Meanwhile, the free radical scavenger mainly traps free radicals including alkyl radicals, carbonyl radicals, hydroxyl radicals, and the like; the molecular chain breakage of the material under the strong radiation effect of short wave ultraviolet can be blocked through the synergistic effect, the degradation of the polypropylene material is avoided, and the ageing resistance and the weather resistance are greatly improved.
The light shielding agent is a substance capable of absorbing or reflecting ultraviolet rays, and can shield the effect of the ultraviolet rays on materials from the physical layer surface, so that the light stabilization effect is further improved.
Although phosphite antioxidants are of various kinds, such as tris (2, 4-di-t-butylphenyl) phosphite (antioxidant 168), bis (2, 4-di-t-butylphenol) pentaerythritol diphosphite (antioxidant 626), tetrakis (2, 4-di-t-butylphenol) -4,4' -biphenylene diphosphite (antioxidant P-EPQ), they do not have excellent photostabilization effect against short wavelength ultraviolet rays even if they are mixed with an ultraviolet absorber, a light shielding agent and a radical scavenger due to the difference in P-O bond para groups in chemical structure.
Preferably, the shortwave ultraviolet light resistant stabilizer comprises the following components in parts by weight:
10 parts of bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, 5-10 parts of ultraviolet absorber, 5-10 parts of free radical scavenger and 5-10 parts of light shielding agent.
When the relative content of the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite in the anti-short-wave ultraviolet stabilizer is relatively high, the light stability performance against short-wave ultraviolet is better.
Preferably, the ultraviolet absorber is one or more of benzophenone ultraviolet absorber, benzotriazole ultraviolet absorber and triazine ultraviolet absorber.
Alternatively, the benzophenone type ultraviolet absorbers may be UV-531, UV-1200, UV214, UV-9.
Alternatively, the benzotriazole ultraviolet light absorber may be UV-5411, UV-326, UV-234.
Alternatively, the triazine uv absorber may be a Chiguard 1064, uv absorber 1164, uv absorber 1577.
Preferably, the radical scavenger is a hindered amine radical scavenger.
Alternatively, the hindered amine radical scavenger may be UV-944, UV-770, UV-622.
The light shielding agent is a substance capable of absorbing or reflecting ultraviolet rays.
The light shielding agents commonly used in the market include zinc oxide particles, titanium dioxide, carbon black, barium sulfate and the like.
Preferably, the light shielding agent is zinc oxide particles.
Preferably, the zinc oxide particles have an average particle diameter of 1 to 100nm.
More preferably, the zinc oxide particles have an average particle diameter of 10 to 50nm.
The invention also provides a preparation method of the anti-shortwave ultraviolet light stabilizer, which comprises the following steps:
mixing bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, ultraviolet absorber, free radical scavenger and light shielding agent uniformly.
The invention also protects a polypropylene composition, which comprises the following components in parts by weight:
60-98 parts of polypropylene, 1-15 parts of polyethylene, 1-30 parts of inorganic filler, 0.05-1 part of antioxidant and 1-2 parts of shortwave ultraviolet light resistant stabilizer.
The polypropylene composition contains 1-2 parts by weight of the short-wave ultraviolet light resistant stabilizer, so that the light stabilizing effect of the polypropylene composition under the irradiation of short-wave ultraviolet light can be effectively improved. According to the detection method of GB/T250-2008, irradiation of 254nm wavelength ultraviolet rays is carried out for 480 hours, and the color fastness of the polypropylene composition is more than or equal to grade 4. This shows that the polypropylene composition has good weather resistance to short wave ultraviolet and is not easy to age and change color.
Preferably, the polypropylene is homo-polypropylene and/or co-polypropylene, and the melt flow rate of the polypropylene is 0.2-100 g/10min under the conditions of 230 ℃ and 2.16 kg.
Preferably, the polyethylene is one or more of high-density polyethylene, low-density polyethylene or linear low-density polyethylene, and the melt flow rate of the polyethylene is 0.1-20 g/10min under the conditions of 190 ℃ and 2.16 kg.
The method for detecting the melt flow rate of polypropylene and polyethylene comprises the following steps: GB/T3682-2018.
Preferably, the inorganic filler is one or more of calcium carbonate, calcium sulfate whisker, talcum powder, mica, glass fiber or barium sulfate.
The inorganic filler is subjected to surface treatment by using a silane coupling agent and low-molecular-weight polysiloxane, wherein the number average molecular weight of the low-molecular-weight polysiloxane is 2-10 ten thousand.
The number average molecular weight of the low molecular weight polysiloxanes is determined by osmotically testing.
Preferably, the mass ratio of the silane coupling agent to the low molecular weight polysiloxane is 1: (0.8-1.2).
The surface treatment method comprises the following steps:
dispersing the silane coupling agent and the low molecular weight polysiloxane in water to obtain a mixed solution, blending the mixed solution and the inorganic filler, and dehydrating and drying.
After the inorganic filler is subjected to surface treatment, the inorganic filler has better compatibility with high molecular compounds such as polypropylene, polyethylene and the like, so that the polypropylene composition has better comprehensive performance.
Preferably, the silane coupling agent is one or more of vinyl triethoxysilane, divinyl tetramethyl disiloxane or 3-aminopropyl triethoxysilane.
Preferably, the antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a hindered phenol antioxidant, and the auxiliary antioxidant is a phosphite antioxidant and/or a thioether antioxidant.
Preferably, the hindered phenol antioxidant is an antioxidant 1010 or an antioxidant 3114.
Preferably, the phosphite antioxidant is an antioxidant 168 or an antioxidant 626.
Preferably, the thio-ether antioxidant is antioxidant 412S or antioxidant DLTDP.
Preferably, the polypropylene composition further comprises 0.1 to 1 part by weight of a zinc-based antibacterial agent.
When the automobile interior trim is sterilized only by ultraviolet rays, a sterilization dead angle which cannot be irradiated by the ultraviolet rays is easy to exist, and a certain amount of zinc-based antibacterial agent is added into the polypropylene composition, so that the polypropylene composition has a certain self-antibacterial effect. And the zinc antibacterial agent does not bring the risk of color change like silver ion antibacterial agent, and is favorable for keeping good appearance of the automobile interior trim after long-term use.
Preferably, the zinc-based antibacterial agent is a zinc ion antibacterial agent and/or nano zinc oxide.
Preferably, the zinc ion antibacterial agent is a glass carrier zinc ion antibacterial agent and/or a zirconium phosphate carrier zinc ion antibacterial agent.
Preferably, the polypropylene composition further comprises 0.2-2 parts by weight of scratch-resistant agent, wherein the scratch-resistant agent is ultrahigh molecular weight polysiloxane, and the number average molecular weight of the ultrahigh molecular weight polysiloxane is more than or equal to 100 ten thousand.
The number average molecular weight of the ultra-high molecular weight polysiloxane is obtained according to an osmotic pressure method.
In general, automotive interiors are required to have certain scratch resistance and scratch resistance, and low-molecular-weight scratch resistance aids such as erucamide and oleamide are usually added into materials. However, the inventors have found that the action mechanism of the amide scratch-resistant auxiliary agent is to migrate to the surface of the material to form a lubricating layer, thereby obtaining scratch resistance, but other functional auxiliary agents such as an antibacterial agent, a light stabilizer and the like are precipitated, and the antibacterial effect or the light stabilizing effect is deteriorated. The ultra-high molecular weight polysiloxane is a bulk scratch resistant agent, and the excellent scratch resistance of the polypropylene composition can be obtained without depending on migration action, so that other properties of the polypropylene composition are not negatively affected.
However, ultra-high molecular weight polysiloxanes also have their own drawbacks: the molecular weight is too high, the dispersibility is poor, and the polypropylene is not easy to be uniformly blended. The inventors have found that, since the inorganic filler is surface-treated with a low molecular weight polysiloxane, the ultra-high molecular weight polysiloxane can be uniformly dispersed in the polypropylene composition by the combination of the low molecular weight polysiloxane.
Preferably, the polypropylene composition further comprises 0.1 to 25 parts by weight of an elastomer.
Preferably, the elastomer is one or more of an ethylene-a olefin copolymer (POE), an ethylene-octene copolymer (POP), an ethylene-propylene-nonconjugated diene terpolymer (EPDM), a styrene-butadiene-styrene block copolymer (SBS) or a hydrogenated styrene-butadiene-styrene block copolymer (SEBS).
The invention also provides a preparation method of the polypropylene composition.
When the polypropylene composition does not contain a zinc-based antibacterial agent, a scratch resistant agent or an elastomer, the preparation method comprises the following steps:
s1, adding polyethylene and a stabilizer resistant to short wave ultraviolet light into an extruder, and performing melt extrusion granulation to obtain a weather-resistant raw material;
s2, mixing the polypropylene, the inorganic filler, the antioxidant and the weather-resistant raw material prepared in the step S1, adding the mixture into an extruder, and carrying out melt mixing, extrusion granulation to obtain the polypropylene composition.
When the polypropylene composition contains an elastomer, a zinc-based antibacterial agent and a scratch-resistant agent, the preparation method comprises the following steps:
s11, adding polyethylene, a shortwave ultraviolet light resistant stabilizer and a scratch resistant agent into an extruder, and performing melt extrusion granulation to obtain a weather resistant raw material;
s21, mixing polypropylene, an elastomer, an inorganic filler, an antioxidant, a zinc antibacterial agent and the weather-resistant raw materials prepared in the step S11, adding the mixture into an extruder, and carrying out melt mixing, extrusion granulation to obtain the polypropylene composition.
Preferably, the extruder is a twin screw extruder, the extrusion temperature in step S1 or S11 is 150 to 200 ℃, and the extrusion temperature in step S2 or S21 is 180 to 250 ℃.
The invention also protects application of the polypropylene composition in preparing an automotive interior material.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention utilizes the compound synergy of the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, the ultraviolet absorber, the free radical capturing agent and the light shielding agent to obtain the anti-short wave ultraviolet light stabilizer with excellent light stabilizing effect on short wave ultraviolet light.
(2) A polypropylene composition containing the stabilizer for resisting short-wave ultraviolet is developed, and has good weather resistance for short-wave ultraviolet and is not easy to age and change color. According to the detection method of GB/T250-2008, the color fastness of the polypropylene composition is more than or equal to grade 4 after 254nm wavelength ultraviolet radiation is circularly irradiated for 480 hours.
(3) In the case where the polypropylene composition further contains a zinc-based antibacterial agent and an ultra-high molecular weight polysiloxane, the polypropylene composition has more excellent antibacterial effect and scratch resistance effect.
Detailed Description
The invention is further described below in connection with the following detailed description.
The starting materials in both examples and comparative examples are commercially available, wherein:
unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Examples 1 to 11
Examples 1-11 respectively provide a stabilizer for resisting short-wave ultraviolet light, the content of each component is shown in table 1, and the preparation method comprises the following steps:
bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, an ultraviolet absorber, a free radical scavenger and a light shielding agent are uniformly mixed according to the table 1 to obtain the shortwave ultraviolet light resistant stabilizer.
TABLE 1 component contents (parts by weight) of the anti-short wave ultraviolet light stabilizers of examples 1 to 11
Examples 12 to 31
Examples 12 to 31 respectively provide a polypropylene composition, the contents of the components are shown in Table 2, and the preparation method comprises the following steps:
s1, adding polyethylene and a stabilizer resistant to short wave ultraviolet light into an extruder, and performing melt extrusion granulation to obtain a weather-resistant raw material;
s2, mixing the polypropylene, the inorganic filler, the antioxidant and the weather-resistant raw material prepared in the step S1, adding the mixture into an extruder, and carrying out melt mixing, extrusion and granulation to obtain the polypropylene composition.
TABLE 2 component content (parts by weight) of Polypropylene compositions of examples 12 to 31
Comparative examples 1 to 8
Comparative examples 1 to 8 each provided a light stabilizer, each of which contained the components shown in Table 3, and was prepared by:
the components were uniformly mixed according to Table 3 to obtain a light stabilizer.
Table 3 component contents (parts by weight) of light stabilizers of comparative examples 1 to 8
Comparative examples 9 to 16
Comparative examples 9 to 16 respectively provide a polypropylene composition, the contents of the respective components are shown in Table 4, and the preparation method comprises the following steps:
s1, adding polyethylene and a light stabilizer into an extruder, and performing melt extrusion granulation to obtain a weather-resistant raw material;
s2, mixing the polypropylene, the inorganic filler, the antioxidant and the weather-resistant raw material prepared in the step S1, adding the mixture into an extruder, and carrying out melt mixing, extrusion and granulation to obtain the polypropylene composition.
Table 4 component contents (parts by weight) of the Polypropylene compositions of comparative examples 9 to 16
Examples 32 to 39
Examples 32 to 39 each provide a polypropylene composition containing a zinc-based antimicrobial agent, a scratch resistant agent, and an elastomer, each of which has the contents shown in Table 5, and the preparation method comprises:
s11, adding polyethylene, a shortwave ultraviolet light resistant stabilizer and a scratch resistant agent into an extruder, and performing melt extrusion granulation to obtain a weather resistant raw material;
s21, mixing the polypropylene, the elastomer, the inorganic filler, the antioxidant, the zinc antibacterial agent and the weather-resistant raw material prepared in the step S11, adding the mixture into an extruder, and carrying out melt mixing and extrusion granulation to obtain the polypropylene composition.
TABLE 5 component content (parts by weight) of Polypropylene compositions of examples 32-39
Comparative examples 17 to 24
Comparative examples 17 to 24 respectively provide a polypropylene composition comprising a zinc-based antimicrobial agent, a scratch resistant agent, and an elastomer, each of which has the contents shown in Table 6, and the preparation method comprises:
s11, adding polyethylene, a shortwave ultraviolet light resistant stabilizer and a scratch resistant agent into an extruder, and performing melt extrusion granulation to obtain a weather resistant raw material;
s21, mixing the polypropylene, the elastomer, the inorganic filler, the antioxidant, the zinc antibacterial agent and the weather-resistant raw material prepared in the step S11, adding the mixture into an extruder, and carrying out melt mixing and extrusion granulation to obtain the polypropylene composition.
Table 6 component contents (parts by weight) of the Polypropylene compositions of comparative examples 17 to 24
Performance testing
The polypropylene compositions prepared in examples 12 to 39 and comparative examples 9 to 16 were subjected to an aging resistance test, wherein the polypropylene compositions prepared in example 12, examples 32 to 39 and comparative examples 17 to 24 were also subjected to a scratch resistance test and an antibacterial property test, by the following methods:
ageing resistance: injecting the polypropylene composition into a square plate with the thickness of 100 x 3mm, respectively ageing by a xenon lamp, ageing by ordinary ultraviolet and ageing by short wave ultraviolet, and detecting the color fastness according to a GB/T250-2008 method, wherein the requirement is more than or equal to level 4;
wherein the xenon lamp aging conditions are: the test conditions of blackboard temperature (89+/-3), box air temperature (62+/-2) and relative humidity (50+/-5) percent are operated for 3.8 hours of illumination circulation; the black board temperature (38+/-3), the box air temperature (38+/-3), the relative humidity (95+/-5) percent are tested to run for 1 hour for dark circulation under the test condition, and the radiation intensity (1.2+/-0.02) W/m 2 The irradiation wavelength is 420nm, and the test time is 624h;
the common ultraviolet aging conditions are as follows: the black standard temperature (60+/-3) DEG C, 8h drying cycle, the irradiation wavelength is 340nm, the irradiation intensity is (0.76+/-0.02) W/m2.multidot.nm -1 The method comprises the steps of carrying out a first treatment on the surface of the Black mark temperature (50+/-3) DEG C, 4 hours of condensation circulation, and turning off a light source; test time is 480h;
the short wave ultraviolet aging conditions are as follows: the black mark temperature (60+/-3) DEG C, 8h drying cycle, irradiation wavelength 254nm, radiation intensity (0.76+/-0.02) W/m 2 ·nm -1 The method comprises the steps of carrying out a first treatment on the surface of the Black mark temperature (50+/-3) DEG C, 4 hours of condensation circulation, and turning off a light source; test time was 480h.
Scratch resistance: the polypropylene composition is molded into a mass skin plate sample with K9A skin lines and specification of 200 x 150 x 3mm, after short wave ultraviolet aging (the short wave ultraviolet aging conditions are the same as above), a figure of 40 x 40mm is formed on the surface of the mass skin plate sample by using a scratch instrument, and a scraper is used for scraping
The scraping force F=10N, the blade grid interval is 2mm, the scraping speed is 1000mm/min, the color difference value in the scraping range is measured by using a color difference meter, the measuring times are more than 5 times, and the average value is taken as a final result, wherein DeltaL is less than or equal to 1.5.
Antibacterial properties: the antibacterial rate of the polypropylene composition to escherichia coli and staphylococcus aureus is calculated according to a GB/T31402-2015 standard method respectively after the polypropylene composition is subjected to short wave ultraviolet aging (the short wave ultraviolet aging conditions are the same as above) to obtain 100-100 mm square plate samples, wherein the antibacterial rate is [ (B-C)/C ] 100%, B is the average value of bacterial counts 24 hours after the samples are inoculated without antibacterial treatment, C is the average value of bacterial counts 24 hours after the samples are inoculated with the antibacterial treatment, and the requirement is more than or equal to 95%.
The results of the aging resistance tests of examples 12 to 39 and comparative examples 9 to 16 are shown in Table 6.
TABLE 6 anti-aging test results
As can be seen from the ageing resistance test results of Table 6, the polypropylene compositions prepared in examples 12 to 39 of the present invention were subjected to xenon lamp ageing, ordinary ultraviolet ageing and short wave ultraviolet ageing after injection molding, and the color fastness was not less than 4, and the color fastness of some examples was 5. According to the test results of comparative examples 9 to 16, although the color fastness of the polypropylene composition prepared by some comparative examples also meets more than 4 levels after aging by a xenon lamp and ordinary ultraviolet aging, the color fastness is less than 4 levels after aging by short wave ultraviolet, and the color fastness of some comparative examples is only 2-3 levels. This shows that the anti-short wave ultraviolet stabilizer has excellent light stabilizing effect on short wave ultraviolet, and can effectively improve the anti-short wave ultraviolet aging performance of the polypropylene composition in a polypropylene system.
From examples 1 and 19 to 21, the light shielding agent was zinc oxide, and the short wave ultraviolet light stabilizer was able to bring about a more excellent anti-aging effect to the polypropylene composition. From examples 12, 23-25, wherein example 24 has a color fastness of grade 4, which is relatively low, it can be seen that the surface treated inorganic filler contributes to better aging resistance of the polypropylene composition.
The polypropylene compositions of comparative examples 9 to 11 used the light stabilizers of comparative examples 1 to 3, respectively, and the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite was replaced with tris (2, 4-di-t-butylphenyl) phosphite, bis (2, 4-di-t-butylphenol) pentaerythritol diphosphite, and tetrakis (2, 4-di-t-butylphenol) -4,4' -biphenyldiphosphite, respectively, in equal amounts as those of example 1. It can be seen that although phosphite antioxidants were also used in comparative examples 1 to 3, they failed to provide a light stabilization effect against short wave ultraviolet rays comparable to bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, and the obtained polypropylene composition was subjected to short wave ultraviolet aging with a color fastness of only 3 grade. By comparing examples 12 to 15, if the content of a certain component in the light stabilizer is too low or absent, a good anti-shortwave ultraviolet effect cannot be achieved.
The scratch resistance test and the antibacterial property test results of example 12, examples 32 to 39, and comparative examples 17 to 24 are shown in Table 7.
TABLE 7 scratch resistance test and antibacterial test results
According to the test results of Table 7, the polypropylene composition of the present invention may further contain a zinc-based antibacterial agent, a scratch-resistant agent, and an elastomer.
From examples 12, 32 to 34, when a zinc-based antibacterial agent was further added to the polypropylene composition, the self-antibacterial effect was more excellent, and the addition of the zinc-based antibacterial agent did not adversely affect the aging resistance of the polypropylene composition in combination with the test results of Table 6. In the practical application as automotive interior, can realize that the shortwave ultraviolet is initiatively disinfected simultaneously, play supplementary self antibacterial effect to the dead angle of disinfecting that ultraviolet irradiation can not be shone.
From examples 35 to 37, when ultra-high molecular weight polysiloxane was further added to the polypropylene composition as a scratch resistant agent, it was possible to uniformly mix the components of the polypropylene composition, so that the scratch resistance of the polypropylene composition was excellent without affecting the aging resistance. In example 38, when the ultrahigh molecular weight polysiloxane was replaced with equal amount of erucamide, the erucamide also provided a certain scratch resistance to the polypropylene composition, but due to its easy migration to the material surface, the migration of erucamide also caused precipitation of the shortwave ultraviolet light resistant stabilizer to a certain extent, resulting in slightly poorer aging resistance and slightly lower color fastness than examples 35 and 36, in combination with the test results of table 6.
According to the test results of comparative examples 17 to 24 in Table 7, the scratch resistance and antibacterial properties after short wave ultraviolet aging were inferior to those of examples 32 to 34 using the short wave ultraviolet light stabilizer not of the present invention in the polypropylene composition. This is because the polypropylene compositions of comparative examples 17 to 24 are inferior in anti-short wave ultraviolet aging property, and after short wave ultraviolet aging, the molecular structure of polypropylene is changed to some extent, and the polypropylene material is degraded to some extent, and the degradation of the material also has negative effects on the antibacterial property and scratch resistance.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The stabilizer for resisting short-wave ultraviolet light is characterized by comprising the following components in parts by weight:
10 parts of bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, 5-20 parts of an ultraviolet absorber, 5-10 parts of a free radical scavenger and 5-20 parts of a light shielding agent;
the ultraviolet absorbent is one or more of benzophenone ultraviolet absorbent or benzotriazole ultraviolet absorbent;
the free radical trapping agent is a hindered amine free radical trapping agent;
the light shielding agent is zinc oxide particles, titanium dioxide, carbon black or barium sulfate.
2. The anti-shortwave ultraviolet light stabilizer according to claim 1, wherein the light shielding agent is zinc oxide particles.
3. The method for preparing the anti-shortwave ultraviolet light stabilizer as claimed in claim 1 or 2, which is characterized by comprising the following steps:
and uniformly mixing the bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, an ultraviolet absorber, a free radical capturing agent and a light shielding agent to obtain the shortwave ultraviolet light resistant stabilizer.
4. The polypropylene composition is characterized by comprising the following components in parts by weight:
60-98 parts of polypropylene, 1-15 parts of polyethylene, 1-30 parts of inorganic filler, 0.05-1 part of antioxidant and 1-2 parts of shortwave ultraviolet light resistant stabilizer as claimed in claim 1 or 2.
5. The polypropylene composition according to claim 4, wherein the inorganic filler is surface-treated with a silane coupling agent and a low molecular weight polysiloxane having a number average molecular weight of 2 to 10 ten thousand.
6. The polypropylene composition according to claim 4 or 5, further comprising 0.1 to 1 part by weight of a zinc-based antibacterial agent, 0.1 to 25 parts by weight of an elastomer, and 0.2 to 2 parts by weight of a scratch resistant agent, wherein the scratch resistant agent is an ultra-high molecular weight polysiloxane having a number average molecular weight of 100 ten thousand or more.
7. The method for producing a polypropylene composition according to claim 4 or 5, comprising the steps of:
s1, adding polyethylene and a stabilizer resistant to short-wave ultraviolet light into an extruder, and performing melt extrusion granulation to obtain a weather-resistant raw material;
s2, mixing the polypropylene, the inorganic filler, the antioxidant and the weather-resistant raw material prepared in the step S1, adding the mixture into an extruder, and carrying out melt mixing, extrusion granulation to obtain the polypropylene composition.
8. Use of the polypropylene composition according to any one of claims 4 to 6 for the preparation of automotive interior trim materials.
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