CN113603961B - Anti-aging polypropylene, preparation process thereof and tray - Google Patents

Anti-aging polypropylene, preparation process thereof and tray Download PDF

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CN113603961B
CN113603961B CN202110715274.9A CN202110715274A CN113603961B CN 113603961 B CN113603961 B CN 113603961B CN 202110715274 A CN202110715274 A CN 202110715274A CN 113603961 B CN113603961 B CN 113603961B
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CN113603961A (en
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胡仁武
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Ningbo Dongtuo Plastic Industry 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
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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Abstract

The application relates to the technical field of protection, and particularly discloses an anti-aging polypropylene, a preparation process thereof and a tray, wherein the tray is prepared from the following raw materials in parts by mass: 45-65 parts of polypropylene, 10-20 parts of modified nano titanium dioxide, 0.2-1 part of anti-aging modifier, 1-3 parts of scratch resistant agent and 10-20 parts of talcum powder; the anti-aging modifier consists of a dispersing agent, an anti-caking agent and a benzotriazole ultraviolet absorbent according to the following weight ratio of (1-4) to (2-4); the preparation method comprises the following steps: polypropylene, modified nano titanium dioxide, an anti-aging modifier, talcum powder and a scratch-resistant agent are uniformly mixed, and then are mixed and extruded by a double-screw extruder. The product of the application can be used for manufacturing the aging-resistant polypropylene tray, and has the advantage of strong aging resistance.

Description

Anti-aging polypropylene, preparation process thereof and tray
Technical Field
The application relates to the technical field of trays, in particular to an anti-aging polypropylene tray.
Background
The tray is a common cargo carrying tool during group transportation, and is widely applied to the fields of production, transportation, storage, circulation and the like. The tray is divided into a wooden tray, a metal tray, a plastic tray and a plastic-wood tray by the material, wherein the plastic tray is a tray which is light in texture, convenient to use and widely applied to the service industry.
Plastic pallets should often be used in outdoor environments where they are susceptible to a range of aging phenomena such as discoloration, strength degradation, etc. Generally, the aging reasons of the plastic trays include illumination aging, damp-heat aging, wind-heat aging, hot-air aging and the like, which are all irreversible changes.
With respect to the above-described related art, the inventors consider that: the plastic tray is easy to age because the plastic tray is influenced by ultraviolet rays under the most common application scene of the plastic tray under the irradiation of outdoor sunlight, and the service life of the plastic tray is greatly shortened.
Disclosure of Invention
In order to improve the ultraviolet resistance of the plastic tray, the application provides the anti-aging polypropylene, the preparation process thereof and the tray.
The technical scheme adopted by the aging-resistant polypropylene is as follows:
in a first aspect, the present application provides an aging-resistant polypropylene, which adopts the following technical scheme:
the anti-aging polypropylene is prepared from the following raw materials in parts by mass: 45-65 parts of polypropylene, 10-20 parts of modified nano titanium dioxide, 0.2-1 part of anti-aging modifier, 1-3 parts of scratch resistance agent and 10-20 parts of talcum powder;
the anti-aging modifier consists of a dispersing agent, an anti-caking agent and a benzotriazole ultraviolet absorbent in the following weight ratio: 2:(1-4):(2-4).
By adopting the technical scheme, the modified nano titanium dioxide uniformly dispersed in the polypropylene can reflect or scatter ultraviolet rays, the dispersing agent and the anticaking agent are uniformly dispersed in the polypropylene in cooperation with the benzotriazole ultraviolet absorbent, so that the absorption effect of the benzotriazole ultraviolet absorbent uniformly mixed in the polypropylene matrix on ultraviolet rays is enhanced, and the modified nano titanium dioxide and the anti-aging modifier within the range are uniformly mixed in the polypropylene; in addition, when the talcum powder is uniformly mixed in the polypropylene, the talcum powder can obviously improve the physical property of the polypropylene, and the polypropylene prepared from the talcum powder in the raw materials has obvious aging-resistant effect.
Preferably, the benzotriazole ultraviolet light absorber is one or a combination of 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole and 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole.
The 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole and the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole both have good ultraviolet absorption effect, and particularly show good ultraviolet absorption performance in polypropylene substrates, wherein the maximum wavelength absorbed by the 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole is 345nm, the maximum wavelength absorbed by the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole is 353nm, and the plastic prepared from the raw materials containing one or the combination of the 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole and the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole has the advantages of good ultraviolet absorption effect and good ultraviolet absorption performance in polypropylene substrates Stronger ultraviolet resistance.
Preferably, the ageing-resistant modifier consists of a dispersing agent, an anticaking agent and 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole according to the following weight ratio: 2:2:2.
The aging-resistant modifier prepared according to the proportion has a stronger ultraviolet absorption effect, and the polypropylene prepared by adding the aging-resistant modifier has stronger aging resistance.
Preferably, the dispersing agent is sodium polynaphthalenesulfonate or sodium methylene dinaphthalenesulfonate.
The sodium polynaphthalenesulfonate is a common dispersant, the sodium methylenedinaphthalenesulfonate is a good dispersant, and the addition of the sodium polynaphthalenesulfonate or the sodium methylenedinaphthalenesulfonate in the anti-aging modifier is beneficial to uniformly dispersing the anti-aging modifier in a polypropylene matrix, so that the absorption effect of the anti-aging modifier on ultraviolet rays is enhanced, and the anti-aging property of the polypropylene added with the anti-aging modifier is enhanced.
Preferably, the anticaking agent is calcium stearate, calcium phosphate or magnesium stearate.
Calcium stearate, calcium phosphate and magnesium stearate are common anticaking agents, so that the benzotriazole ultraviolet light absorber is not easy to agglomerate in a polypropylene matrix and keeps a loose state, the aging-resistant modifier is favorably and uniformly dispersed in the polypropylene matrix, the absorption effect of the aging-resistant modifier on ultraviolet light is enhanced, and the aging resistance of polypropylene added with the aging-resistant modifier is enhanced.
Preferably, the scratch resistant agent is a low molecular weight polyethylene wax.
By adopting the technical scheme, the polyethylene wax can reduce the friction coefficient of the surface of the material, is beneficial to the uniform dispersion of other raw materials in the PP matrix, and improves the scratch resistance of the polypropylene prepared from the polyethylene wax.
Preferably, the low molecular weight polyethylene wax has a molecular weight of 600-1000.
By adopting the technical scheme, the low-molecular-weight polyethylene wax in the range has better capability of reducing the surface friction coefficient of the material, namely, the polyethylene prepared by adding the low-molecular-weight polyethylene wax in the range into the raw material has better scratch resistance.
Preferably, the modified nano titanium dioxide is prepared by soaking nano titanium dioxide in methyl silicone oil solution, stirring and mixing, drying and then roasting at high temperature.
By adopting the technical scheme, after the nano titanium dioxide is modified by the methyl silicone oil, nano titanium dioxide particles are stably dispersed and uniformly dispersed in the polymer matrix, the ultraviolet ray reflection or scattering performance of the nano titanium dioxide is enhanced, and the ultraviolet ray resistance of polypropylene prepared from the raw material added with the modified nano titanium dioxide is enhanced.
In a second aspect, the present application provides a preparation process of an aging-resistant polypropylene, which adopts the following technical scheme:
a preparation process of aging-resistant polypropylene comprises the following steps:
the polypropylene, the modified nano titanium dioxide, the anti-aging modifier, the talcum powder and the scratch-resistant agent are uniformly mixed, and are subjected to mixing and extrusion by a double-screw extruder to obtain the anti-aging polypropylene.
By adopting the technical scheme, after the raw materials in the range are uniformly mixed and extruded by a double-screw extruder, the raw materials including the modified nano titanium dioxide and the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole are uniformly mixed in the prepared polypropylene matrix, so that the prepared polypropylene has higher impact strength and ultraviolet resistance.
In a third aspect, the present application provides a tray, which adopts the following technical solution:
a tray is made of the anti-aging polypropylene.
By adopting the technical effects, the tray made of the aging-resistant polypropylene has good ultraviolet resistance, and has stronger aging resistance under outdoor environment, especially under long-term sunlight irradiation.
In summary, the present application has the following beneficial effects:
1. 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole is added and uniformly mixed in the raw material, and the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole has the capability of absorbing ultraviolet rays irradiated from the outside, so that the aging resistance of the polypropylene prepared by the aging-resistant modifier added with the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole is enhanced;
2. the modified nano titanium dioxide is added and uniformly and stably dispersed in the prepared polypropylene, and the characteristics of reflection and ultraviolet scattering of the modified nano titanium dioxide are matched with the ultraviolet absorption capacity of the 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole uniformly dispersed in the polypropylene matrix, so that the aging resistance of the prepared polypropylene is enhanced.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw material components of the invention are shown in the table 1:
TABLE 1 sources of the raw material components
Figure BDA0003134847210000031
Examples
Examples 1-13 were prepared in the same manner, except that the component materials were varied in weight as shown in Table 2.
A preparation process of aging-resistant polypropylene comprises the following steps:
(1) adding 45kg of polypropylene, 10kg of talcum powder, 1kg of low molecular weight polyethylene wax (molecular weight 600-1000), 10kg of modified nano titanium dioxide and 0.2kg of ageing-resistant modifier into a high-speed mixer for mixing, and then mixing and extruding the mixture by a double-screw extruder to obtain ageing-resistant polypropylene;
the technological parameters of the double-screw extruder are as follows: the temperature of the section 1 is 185-200 ℃, the temperature of the section 2 is 185-210 ℃, the temperature of the section 3 is 185-210 ℃, the temperature of the section 4 is 185-210 ℃, the temperature of the section 5 is 185-210 ℃, the temperature of the section 6 is 185-210 ℃, the temperature of the section 7 is 185-210 ℃, the temperature of the section 8 is 185-230 ℃, the temperature of the section 9 is 220-250 ℃, the temperature of the section 10 is 220-250 ℃, the temperature of the head section is 200-230 ℃ and the pressure of the head section is 3.8 MPa.
The preparation method of the modified nano titanium dioxide comprises the following steps:
s1: dissolving 4kg of methyl silicone oil in 200L of n-hexane solvent, adding 40kg of nano titanium dioxide, and uniformly stirring to obtain a mixed solution;
s2: evaporating the mixed solution to dryness at the water bath temperature of 90 ℃, and placing the dried mixed solution in an oven for drying to prepare nano titanium dioxide for depositing the methyl silicone oil;
s3: and (3) placing the nano titanium dioxide deposited with the methyl silicone oil in a muffle furnace, heating to 500 ℃ at the speed of 5 ℃/min under the oxygen-enriched condition, and keeping for 3 hours to prepare the modified nano titanium dioxide.
TABLE 2 materials and their weights in examples 1-13
Figure BDA0003134847210000041
Figure BDA0003134847210000051
Figure BDA0003134847210000061
Example 14
The difference from example 10 is that the low molecular weight polyethylene wax (molecular weight 600-1000) used in the raw material is replaced by 2kg of tungsten disulfide with a particle size of 100nm, which is purchased from Yam nanotechnology Co., Ltd, Zhejiang.
Example 15
The difference from example 10 was that talc used in the starting material was replaced with 22kg of chlorinated polyethylene, which was purchased from alfa aesar (china) chemical limited.
Example 16
The difference from example 10 is that 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole in the aging resistance modifier component was replaced by the same mass of 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole, which was purchased from Qingdajie Jeldahl new materials science and technology, Inc.
Comparative example
Comparative example 1
The difference from the example 10 is that no dispersing agent is added in the aging resistant modifier, and the weight ratio of calcium stearate in the aging resistant modifier is as follows: 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole 2: 2.
Comparative example 2
The difference from example 10 is that the aging resistance modifier contains sodium polynaphthalenesulfonate: calcium stearate: 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole ═ 10:2: 2.
Comparative example 3
The difference from the example 10 is that no anticaking agent is added in the raw materials, and the sodium polynaphthalenesulfonate salt in the aging-resistant modifier: 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole 2: 2.
Comparative example 4
The difference from example 10 is that the aging resistance modifier contains sodium polynaphthalenesulfonate: calcium stearate: 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole 2:10: 2.
Comparative example 5
The difference from example 10 is that benzotriazole-based ultraviolet absorber was not added to the starting material, and sodium polynaphthalenesulfonate was added to the aging-resistant modifier: 2: 2.
Comparative example 6
The difference from example 10 is that the aging resistance modifier contains sodium polynaphthalenesulfonate: calcium stearate: 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole 2:2: 10.
Comparative example 7
The difference from the examples is that no aging resistance modifier is added to the raw materials.
Performance test
The aging-resistant polypropylenes obtained in examples 1 to 16 and comparative examples 1 to 7 were each randomly measured in 3 blocks of 30cm × 30cm × 5mm in size, and each of the samples was subjected to the following performance test, and the three monitored data of each group were averaged, in each of 3 sets.
Test I, impact Strength test
The impact strength of polypropylene was measured by referring to the simple beam pendulum impact test method in ISO 179-1-2010, measurement of pendulum impact Properties of plastics, each sample was formed into a pattern of a prescribed size, the pattern was examined and data was recorded, and the impact strength (J/m) of the patterns in examples 1-16 and comparative examples 1-7 was calculated.
Test II, tensile Strength test
Referring to the method for measuring the tensile strength of polypropylene in GB/T1040-92 "test method for tensile Properties of plastics", samples of each of the samples were prepared in a predetermined size, and the tensile strength (MPa) of the samples of examples 1 to 16 and comparative examples 1 to 7 was calculated by measuring the samples and recording the data
Test III, scratch resistance test
And (3) evaluating the scratch degree by using a scratch tester: a mechanically driven doctor blade was used to scrape a line pattern across the polypropylene surface, with the doctor blade only scraping in one direction and only once per test. The test conditions were: temperature: 23 ± 5 ℃, holding power: 10N, scratching speed: 1000mm/min, blade diameter: 1 mm. The color deviation Δ E of the non-scratched surfaces compared to each other was then measured using a colorimeter, and the color deviation Δ E of the patterns of each group in examples 1 to 16 and comparative examples 1 to 7 was recorded, and the average value of each group was recorded.
Test four, aging resistance test
Referring to GB/T14522- 2 The samples were prepared in a predetermined size under conditions of x nm, continuous light irradiation for 700 hours, black panel temperature of 63 ℃ and no spraying, and the samples were examined and data were recorded to calculate the rate of decrease in impact strength (%), the rate of decrease in tensile strength (%) and the rate of increase in color deviation (%) before and after the tests for the samples in examples 1 to 16 and comparative examples 1 to 7.
And (3) detection results: the results of examination of the experimental samples prepared in examples 1 to 16 and comparative examples 1 to 7 are shown in Table 3.
Table 3 type performance test results table
Figure BDA0003134847210000071
Figure BDA0003134847210000081
As can be seen by combining examples 1-13 with comparative example 7 and by combining Table 3, the impact strength of the samples made with the raw materials in the preferred range of the present application was similar to the impact strength of the samples made with the raw materials without the addition of the aging resistance modifier, i.e., the samples made with the raw materials in the preferred range of the present application had impact strengths similar to the samples made with the raw materials without the addition of the aging resistance modifier.
It can be seen from the combination of example 10 and comparative examples 1 to 7 and Table 3 that the impact strength of the samples prepared using the aging resistance modifier in the preferred range of the present application is similar to that of the samples without the aging resistance modifier added to the raw materials, the impact strength of the samples prepared using the aging resistance modifier with too much or too little diffusing agent is similar to that of the samples without the aging resistance modifier added to the raw materials, the impact strength of the samples prepared using the aging resistance modifier with too much or too little anticaking agent is similar to that of the samples without the aging resistance modifier added to the raw materials, and the impact strength of the samples prepared using the aging resistance modifier with too much or too little benzotriazole-type ultraviolet absorber is similar to that of the samples without the aging resistance modifier added to the raw materials.
As can be seen by combining examples 10 and 16 with Table 3, the impact strength of the samples prepared using the aging modifier for 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole was similar to that of the samples prepared using the aging modifier for 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole, i.e., the samples prepared using the starting material of the present application had impact strength similar to that of the samples prepared using the aging modifier for 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole.
Combining examples 10, 14 and Table 3, it can be seen that the samples made with the low molecular weight polyethylene wax (molecular weight 600-1000-; combining 10, 15 and combining table 3, it can be seen that the samples made with talc have higher impact strength than the samples made with chlorinated polyethylene, i.e. the samples made with talc have higher impact strength than the samples made with chlorinated polyethylene.
It can be seen from the combination of examples 1 to 13 and comparative example 7 and from Table 3 that the tensile strength of the samples produced using the raw materials in the preferred range of the present application is similar to that of the samples without the addition of the aging resistance modifier, i.e., the samples produced using the modified titanium dioxide in the preferred range of the present application have similar tensile strength to that of the samples without the addition of the aging resistance modifier.
It can be seen from the combination of example 10 and comparative examples 1 to 6 and Table 3 that the tensile strength of the samples prepared using the aging resistance modifier in the preferred range of the present application is similar to that of the samples without the aging resistance modifier added to the raw material, the tensile strength of the samples prepared using the aging resistance modifier with too much or too little diffusing agent is similar to that of the samples without the aging resistance modifier added to the raw material, the tensile strength of the samples prepared using the aging resistance modifier with too much or too little anticaking agent is similar to that of the samples without the aging resistance modifier added to the raw material, and the tensile strength of the samples prepared using the aging resistance modifier with too much or too little benzotriazole-type ultraviolet absorber is similar to that of the samples without the aging resistance modifier added to the raw material.
Combining examples 10, 14 and Table 3, it can be seen that the tensile strength of the samples made with the low molecular weight polyethylene wax (molecular weight 600-1000-; combining 10, 15 and combining table 3, it can be seen that the tensile strength of the samples made with talc was higher than the tensile strength of the samples made with chlorinated polyethylene, i.e., the samples made with talc had a higher tensile strength than the samples made with chlorinated polyethylene.
As can be seen by combining examples 10 and 16 with Table 3, the impact strength of the samples prepared using the aging modifier for 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole was similar to that of the samples prepared using the aging modifier for 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole, i.e., the samples prepared using the starting material of the present application had impact strength similar to that of the samples prepared using the aging modifier for 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole.
As can be seen by combining examples 1 to 13 and comparative example 7 with Table 3, the color deviation of the samples prepared using the raw materials in the preferred range of the present application was similar to the color deviation of the samples without the addition of the anti-aging modifier, i.e., the samples prepared using the raw materials in the preferred range of the present application had scratch resistance similar to the samples without the addition of the anti-aging modifier.
It can be seen from the combination of example 10 and comparative examples 1 to 7 and Table 3 that the color deviation of the samples prepared using the aging resistance modifier in the preferred range of the present application is lower than that of the samples without the aging resistance modifier added to the raw materials, the color deviation of the samples prepared using the aging resistance modifier with too much or too little diffusing agent is similar to that of the samples without the aging resistance modifier added to the raw materials, the color deviation of the samples prepared using the aging resistance modifier with too much or too little anticaking agent is similar to that of the samples without the aging resistance modifier added to the raw materials, and the color deviation of the samples prepared using the aging resistance modifier with too much or too little benzotriazole-type ultraviolet absorber is similar to that of the samples without the aging resistance modifier added to the raw materials.
As can be seen by combining examples 10 and 14 with Table 3, the color deviation of the sample made with the low molecular weight polyethylene wax (molecular weight 600-1000) is lower than that of the sample made with tungsten disulfide, i.e., the sample made with the low molecular weight polyethylene wax (molecular weight 600-1000) has higher scratch resistance than that of the sample made with tungsten disulfide; combining 10, 15 and combining table 3, it can be seen that the color deviation of the samples made with talc was lower than the color deviation of the samples made with chlorinated polyethylene, i.e., the samples made with talc had a scratch resistance greater than the samples made with chlorinated polyethylene.
As can be seen by combining examples 10 and 16 with Table 3, the tensile strength of the samples made with the aging resistance modifier for 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole was similar to that of the samples made with the aging resistance modifier for 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole, i.e., the tensile strength of the samples made with the starting material of this application was similar to that of the samples made with the aging resistance modifier for 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole.
As can be seen by combining examples 1 to 13 and comparative example 7 with Table 3, the samples made with the raw materials in the preferred range of the present application exhibited different degrees of reduction in the rate of decrease in impact strength, the rate of decrease in tensile strength, and the rate of increase in color deviation than the samples made with the raw materials without the addition of the aging resistance modifier, i.e., the samples made with the raw materials in the preferred range of the present application exhibited stronger aging resistance than the samples made with the raw materials without the addition of the aging resistance modifier.
As can be seen by combining examples 2, 4, 5 and comparative example 7 with Table 3, the aging resistance modifier in the preferred range of the present application is lower in the decrease rate of impact strength, decrease rate of tensile strength and increase rate of color deviation than the sample without the aging resistance modifier added to the raw material, i.e., the sample with the aging resistance modifier in the preferred range of the present application has a stronger ultraviolet resistance than the sample without the aging resistance modifier added to the raw material.
As can be seen by combining examples 8, 10 to 13 and comparative example 7 with Table 3, the samples prepared using the proportions of the components of the aging resistance modifier within the preferred ranges of the present application are significantly lower in the decrease rate of impact strength, the decrease rate of tensile strength and the increase rate of color deviation than the samples without the addition of the aging resistance modifier to the raw materials, i.e., the samples prepared using the proportions of the components of the aging resistance modifier within the preferred ranges of the present application are significantly higher in aging resistance than the samples without the addition of the aging resistance modifier to the raw materials.
As can be seen by combining example 10 with comparative examples 1 to 7 and Table 3, the samples prepared using the aging resistance modifier in the preferred ranges of the present application all had lower decrease rates of impact strength, decrease rates of tensile strength and increase rates of color deviation than the samples without the aging resistance modifier added to the raw materials, the samples prepared using too much or too little of the diffusing agent had decrease rates of impact strength, decrease rates of tensile strength and increase rates of color deviation similar to those of the samples without the aging resistance modifier added to the raw materials, and the samples prepared using too much or too little of the aging resistance modifier had decrease rates of impact strength, decrease rates of tensile strength and increase rates of color deviation similar to those of the samples without the aging resistance modifier added to the raw materials, The reduction rate of tensile strength and the increase rate of color deviation are similar, and the reduction rate of impact strength, the reduction rate of tensile strength and the increase rate of color deviation of a sample prepared by using the aging-resistant modifier of the benzotriazole ultraviolet absorbent with too much or too little are similar to those of a sample without the aging-resistant modifier added in raw materials.
As can be seen by combining examples 10 and 16 with Table 3, the samples prepared using the aging resistance modifier for 2- (3, 5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole exhibited similar decrease rates in impact strength, tensile strength and color shift as compared with the samples prepared using the aging resistance modifier for 2- (3, 5-di-t-amyl-2-hydroxyphenyl) benzotriazole, i.e., the samples prepared using the starting materials of the present application exhibited aging resistance performance slightly higher than that of the samples prepared using the aging resistance modifier for 2- (3, 5-di-t-amyl-2-hydroxyphenyl) benzotriazole.
As can be seen by combining examples 10 and 14 with Table 3, the samples made of the low molecular weight polyethylene wax (molecular weight 600-1000-; it can be seen from the combination of 10 and 15 and table 3 that the samples made of talc have lower reduction rates of impact strength, tensile strength and color deviation than the samples made of chlorinated polyethylene, i.e., the samples made of talc have higher ultraviolet resistance than the samples made of chlorinated polyethylene.
In summary, in the examples having the impact strength, tensile strength and scratch resistance superior to those of the samples without the addition of the aging resistance modifier to the raw materials, the decrease rate of impact strength, decrease rate of tensile strength and increase rate of color deviation were the lowest in example 10, i.e., the aging resistance of example 10 was the strongest.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (3)

1. An aging-resistant polypropylene, characterized in that: the feed is prepared from the following raw materials in parts by mass: 45-65 parts of polypropylene, 10-20 parts of modified nano titanium dioxide, 0.2-1 part of anti-aging modifier, 1-3 parts of scratch resistant agent and 10-20 parts of talcum powder;
the aging-resistant modifier consists of a dispersing agent, an anticaking agent and 2- (3, 5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole according to the following weight ratio: 2:2: 2;
the scratch resistant agent is low molecular weight polyethylene wax, and the molecular weight of the low molecular weight polyethylene wax is 600-1000;
the modified nano titanium dioxide is prepared by soaking nano titanium dioxide in methyl silicone oil solution, stirring and mixing, drying and then roasting at high temperature;
the dispersing agent is sodium polynaphthalenesulfonate or sodium methylene dinaphthalenesulfonate;
the anticaking agent is calcium stearate, calcium phosphate or magnesium stearate.
2. A process for preparing an aging-resistant polypropylene according to claim 1, wherein: the method comprises the following steps: the polypropylene, the modified nano titanium dioxide, the anti-aging modifier, the talcum powder and the scratch-resistant agent are uniformly mixed, and are subjected to mixing and extrusion by a double-screw extruder to obtain the anti-aging polypropylene.
3. A pallet, characterized by: made from the aging-resistant polypropylene of claim 1.
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CN105131655B (en) * 2015-07-20 2017-10-24 苏州宇希新材料科技有限公司 The nano titanium oxide that a kind of liquid phase siliceous deposits is modified
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