CN1431481A - Method for evaluating ultraviolet shielding properties of nano powder material - Google Patents
Method for evaluating ultraviolet shielding properties of nano powder material Download PDFInfo
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- CN1431481A CN1431481A CN 03114952 CN03114952A CN1431481A CN 1431481 A CN1431481 A CN 1431481A CN 03114952 CN03114952 CN 03114952 CN 03114952 A CN03114952 A CN 03114952A CN 1431481 A CN1431481 A CN 1431481A
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Abstract
The invention belongs to the technique area of evaluating the properties of materials. The steps of operation includes preparing the crane, the setting up the disperse system of the nano powder material to the evaluated, the setting up the background, the measuring the ultraviolet sheidling curve of the material and the evaluating the performance of shielding ultraviolet. Glycol is selected as the dispersant. Siphon technique is utilized to carrier out the automatic film coating, providing high accuracy, good repeatability, fast analysis testing. The method can evaluate the properties of material for shielding ultraviolet, providing the reference frame for developing new nano material and filtering out suitable material for shielding ultraviolet so as to possess wide application prospect.
Description
Affiliated technical field
The present invention relates to a kind of nano-powder material uv-shielding capacity appraisal procedure, belong to material property assessment technology field.
Background technology
Nano-powder material has obtained broad research and Preliminary Applications because of its unique physics, chemical property.Multiple materials such as nano-powder titania, zirconium dioxide have been added in cosmetics, the sun-proof coating, and the ultraviolet ray in order in the shielding daylight prevents injury of human, delays paint aging.At present existing several different methods is used for the uv-shielding capacity of assessment material, and common have solwution method, adhesive tape method and film (a filming) method.But these methods generally only are applicable to the uv-shielding capacity of assessment organic ultraviolet screener, and are not suitable for the assessment of nano-powder material uv-shielding capacity.For promoting the application of nano-powder material in the ultraviolet protection industry, press for a kind of method of assessing the nano-powder material uv-shielding capacity.
Summary of the invention
The present invention aims to provide a kind of nano-powder material uv-shielding capacity appraisal procedure, and formulates the evaluation criteria of nano-powder material uv-shielding capacity.It is fast that this method has estimating velocity, the accuracy height, and high repeatability and other advantages is for the sign of nano-powder material provides parameter, for the application of nano-powder material in the ultraviolet protection industry provides screening criteria.
The present invention is achieved through the following technical solutions above-mentioned target, now is described with reference to the accompanying drawings content of the present invention.A kind of appraisal procedure of nano-powder material uv-shielding capacity is characterized in that, the concrete operations step:
The preparation of first step siphon device
Siphon device is made up of two pieces of quartz glass plates 1, quartz glass plate 1 is rectangular, specification is 45mm * 10mm * 1mm, on every pieces of quartz glass plate 1 all the edge along two longer sides be stained with adhesive tape 2, the width of adhesive tape 2 and thickness are respectively 1.5mm and 0.05mm, the one side that then two pieces of quartz glass plates 1 is stained with adhesive tape 2 is staggered relatively, and clamps with clip, and making and forming the gap between the two pieces of quartz glass plates 1 is the interlayer of 0.1mm;
The foundation of second step nano-powder material dispersed system to be assessed
Nano-powder material to be assessed is scattered in the ethylene glycol, and ultrasonic agitation is made nano-powder material dispersed system to be assessed, and the mass percentage content of nano-powder material to be assessed in this dispersed system is 0.2%;
The foundation of the 3rd step background
0.5cm place under the ethylene glycol liquid level is immersed in described siphon device lower end, the interlayer of ethylene glycol between quartz glass plate 1 slowly siphon to quartz glass plate 1 top, form film 3, after treating that ethylene glycol is full of siphon device, siphon device one end is sealed with adhesive tape, and be positioned over sealing end in the ultraviolet-visible spectrophotometer downwards, scanning film 3, the parameter that scanning is adopted is: light path is 0.1mm, sweep limit 700nm～200nm, sampled point is 0.5nm at interval, sweep velocity 2400nm/min, and scanning result is as background;
The mensuration of the ultraviolet shielded curve of nano-powder material that the 4th step is to be assessed
Step operation by the 3rd step changes the ethylene glycol in this step into nano-powder material dispersed system to be assessed that second step prepared, and scanning result is the ultraviolet shielded curve of this material;
The uv-shielding capacity assessment of the 5th step
Formulate the evaluation criteria of nano-powder material uv-shielding capacity: at the ultraviolet region of wavelength between 200nm～400nm, the nano-powder material of maximum absorbance value A 〉=0.7, its uv-shielding capacity is evaluated as good level, the nano-powder material of maximum absorbance value A＜0.4, its uv-shielding capacity is evaluated as bad level, fall between, the i.e. nano-powder material of 0.4≤maximum absorbance value A＜0.7, its uv-shielding capacity is evaluated as regular grade, with the result that records in the 4th step therewith standard contrast, can assess out the rank of the uv-shielding capacity of nano-powder material.
Appraisal procedure of the present invention is further characterized in that the model of ultraviolet-visible spectrophotometer is Varian, Cary 50Probe.
Principle of work.Nano-powder material mainly is to cause by absorption and scattering to ultraviolet light to the shielding action of ultraviolet light.Uv-shielding capacity is not only relevant with the kind of nano material, also is subjected to all multifactor influences such as nano-powder material particle size, crystal formation simultaneously.Single S EM, TEM, AFM or XRD result are difficult to directly characterize the quality of nano-powder material uv-shielding capacity.
The present invention not only provides a kind of appraisal procedure of nano-powder material uv-shielding capacity, has also formulated corresponding evaluation criteria.Setting up evaluation system needs a kind of suitable spreading agent, makes the nano-powder material particle can stablize, be scattered in wherein equably.On the basis of a large amount of experiments, spreading agent is chosen to be ethylene glycol.Because most nano-powder materials surface has hydroxyl to exist, can form hydrogen bond with ethylene glycol; Ethylene glycol has suitable viscosity in addition, has guaranteed that nano-powder material not only has good dispersiveness in ethylene glycol, also have good stability.
The homogeneity of film 3 and reappearance are directly connected to the reliability of data, but present used masking technique defectives such as complexity, thicknesses of layers poor reproducibility that often possess skills, and are difficult to success and are used for assessment to the nano-powder material uv-shielding capacity.Prepared siphon device among the present invention, utilized the siphon principle of liquid to realize automatic spray, thereby guaranteed the homogeneous and the reappearance of film thickness.That 1 of two pieces of quartz glass plate is 0.1mm at interval in the operation, in the time of in immersing the nano-powder material dispersed system, because syphonic effect can will be come in ethylene glycol and the even nano-powder material siphon that disperses wherein at an easy rate, forming the thickness perseverance in the middle of quartz glass plate 1 is the film of 0.1mm, is used for the mensuration of absorbance.
Quality for assessment nano-powder material uv-shielding capacity, the present invention has formulated the evaluation criteria of nano-powder material uv-shielding capacity: when light path is 0.1mm, it is that 0.2% dispersed system is at the ultraviolet region of wavelength between 200nm～400nm that nano-powder material is scattered in the mass percent concentration that forms in the ethylene glycol, the nano-powder material of maximum absorbance value A 〉=0.7, its uv-shielding capacity are evaluated as good level; The nano-powder material of maximum absorbance value A＜0.4, its uv-shielding capacity are evaluated as bad level; Fall between, i.e. the nano-powder material of 0.4≤maximum absorbance value A＜0.7, its uv-shielding capacity is evaluated as regular grade, and this evaluation criteria is shown in dotted line among Fig. 24,5.
The present invention has the following advantages:
1. selecting ethylene glycol is spreading agent, utilizes hydroxyl in its structure and suitable viscosity, and nano-powder material is scattered in wherein, has obtained even, stable dispersed system;
2. utilize siphon technology to carry out automatic spray, the film thickness homogeneous guarantees that appraisal procedure has higher accuracy and good reappearance;
3. formulated the evaluation criteria of nano-powder material uv-shielding capacity, the information that provides can be directly used in production, the modification that instructs nano material, and selects nano-powder material for use for ultraviolet shielded aspect direct screening foundation is provided;
4. method is simple, and cost is low, and analytical test speed is fast, and data reappearance is good.
Description of drawings
Fig. 1 is the siphon device structural representation;
Fig. 2 is the ultraviolet shielded curve of various nano-powder materials, and the transverse axis and the longitudinal axis are respectively absorbance A and wavelength (unit is nm).Wherein curve the 4, the 5th, the evaluation criteria of nano-powder material uv-shielding capacity.
Embodiment
Embodiment 1
Nano-powder material to be assessed is the P25 type nano-TiO that German Degussa company produces
2, its concrete technical indicator is: particle diameter is 21nm, the BET surface area is 50 ± 15m
2/ g, crystal formation are 80% anatase phase, 20% rutile ore phase; The preparation method, vapor phase method.
Utilize method provided by the invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometers, the ultraviolet shielded curve that records this material is shown in Fig. 2 (A).Scanning result shows that this material has a very high platform at ultraviolet region, and maximum absorbance value A is 0.79, and the uv-shielding capacity of this material is evaluated as good level.
Embodiment 2
The CFA-TiO that nano-powder material to be assessed provides for domestic certain enterprise
2Nano-powder material, material granule particle diameter are 90nm, and crystal formation is the rutile ore phase.
Utilize method provided by the invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometers, the ultraviolet shielded curve that records this material is shown in Fig. 2 (B).Scanning result shows that this material is 0.47 at the maximum absorbance value A of ultraviolet region, and the uv-shielding capacity of this material is evaluated as regular grade.
Embodiment 3
Nano-powder material to be assessed is a nanometer Fe
2O
3Particle diameter is 48nm.
Utilize method provided by the present invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometers record the ultraviolet shielded curve of this material shown in Fig. 2 (C).Scanning result shows that this material is 0.30 at the maximum absorbance value A of ultraviolet region, and the uv-shielding capacity of this material is evaluated as bad level.
Nano-powder material to be assessed is coating 101 nano-TiOs that domestic certain enterprise provides
2
Utilize method provided by the invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometers record the ultraviolet shielded curve of this material shown in Fig. 2 (D).Scanning result shows that this material is 0.23 at the maximum absorbance value A of ultraviolet region, and the uv-shielding capacity of this material is evaluated as bad level.
Nano-powder material to be assessed is the nano-TiO that homemade Fe mixes
2, its particle diameter is 48nm.
Utilize method provided by the present invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometers record the ultraviolet shielded curve of this material shown in Fig. 2 (E).Scanning result shows that this material is 0.20 at the maximum absorbance value A of ultraviolet region, and the uv-shielding capacity of this material is evaluated as bad level.
Embodiment 6
Nano-powder material to be assessed is the hydrophilic nano SiO that Degussa company provides
2, particle diameter is 7nm, the BET surface area is 300 ± 30m
2/ g.
Utilize method provided by the invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometers record the ultraviolet shielded curve of this material shown in Fig. 2 (F).Scanning result shows that this material has only very poor absorption to ultraviolet light, and the uv-shielding capacity of this material is evaluated as bad level.
Above embodiment explanation, appraisal procedure of the present invention can not only be assessed the nano-powder material uv-shielding capacity, can also provide reliable evaluation measures to the exploitation and the sign of new nano-powder material; The present invention simultaneously has wide application prospect for the suitable ultraviolet light screener of daily chemical industry screening provides important reference frame in fields such as material and daily-use chemical industries.
Claims (2)
1. the appraisal procedure of a nano-powder material uv-shielding capacity is characterized in that, the concrete operations step:
The preparation of first step siphon device
Siphon device is made up of two pieces of quartz glass plates 1, quartz glass plate 1 is rectangular, specification is 45mm * 10mm * 1mm, on every pieces of quartz glass plate 1 all the edge along two longer sides be stained with adhesive tape 2, the width of adhesive tape 2 and thickness are respectively 1.5mm and 0.05mm, the one side that then two pieces of quartz glass plates 1 is stained with adhesive tape 2 is staggered relatively, and clamps with clip, and making and forming the gap between the two pieces of quartz glass plates 1 is the interlayer of 0.1mm;
The foundation of second step nano-powder material dispersed system to be assessed
Nano-powder material to be assessed is scattered in the ethylene glycol, and ultrasonic agitation is made nano-powder material dispersed system to be assessed, and the mass percentage content of nano-powder material to be assessed in this dispersed system is 0.2%;
The foundation of the 3rd step background
0.5cm place under the ethylene glycol liquid level is immersed in described siphon device lower end, the interlayer of ethylene glycol between quartz glass plate 1 slowly siphon to quartz glass plate 1 top, form film 3, after treating that ethylene glycol is full of siphon device, siphon device one end is sealed with adhesive tape, and be positioned over sealing end in the ultraviolet-visible spectrophotometer downwards, scanning film 3, the parameter that scanning is adopted is: light path is 0.1mm, sweep limit 700nm～200nm, sampled point is 0.5nm at interval, sweep velocity 2400nm/min, and scanning result is as background;
The mensuration of the ultraviolet shielded curve of nano-powder material that the 4th step is to be assessed
Step operation by the 3rd step changes the ethylene glycol in this step into nano-powder material dispersed system to be assessed that second step prepared, and scanning result is the ultraviolet shielded curve of this material;
The uv-shielding capacity assessment of the 5th step
Formulate the evaluation criteria of nano-powder material uv-shielding capacity: at the ultraviolet region of wavelength between 200nm～400nm, the nano-powder material of maximum absorbance value A 〉=0.7, its uv-shielding capacity is evaluated as good level, the nano-powder material of maximum absorbance value A＜0.4, its uv-shielding capacity is evaluated as bad level, fall between, the i.e. nano-powder material of 0.4≤maximum absorbance value A＜0.7, its uv-shielding capacity is evaluated as regular grade, with the result that records in the 4th step therewith standard contrast, can assess out the rank of the uv-shielding capacity of nano-powder material.
2. the appraisal procedure of a kind of nano-powder material uv-shielding capacity according to claim 1 is characterized in that, the model of ultraviolet-visible spectrophotometer is Varian, Cary50Probe.
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| CNB031149529A CN1187599C (en) | 2003-01-17 | 2003-01-17 | Method for evaluating ultraviolet shielding properties of nano powder material |
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| CN1187599C CN1187599C (en) | 2005-02-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501376C (en) * | 2005-08-08 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Nanomaterial phase transfer detection device and method |
| CN109406434A (en) * | 2018-09-14 | 2019-03-01 | 安徽大学 | Sun-screening efficacy test method of sun-screening product |
-
2003
- 2003-01-17 CN CNB031149529A patent/CN1187599C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501376C (en) * | 2005-08-08 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Nanomaterial phase transfer detection device and method |
| CN109406434A (en) * | 2018-09-14 | 2019-03-01 | 安徽大学 | Sun-screening efficacy test method of sun-screening product |
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| CN1187599C (en) | 2005-02-02 |
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