CN106501223A - A kind of detection method of titanium dioxide covering power in the plastic - Google Patents
A kind of detection method of titanium dioxide covering power in the plastic Download PDFInfo
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- CN106501223A CN106501223A CN201611086067.7A CN201611086067A CN106501223A CN 106501223 A CN106501223 A CN 106501223A CN 201611086067 A CN201611086067 A CN 201611086067A CN 106501223 A CN106501223 A CN 106501223A
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Abstract
The present invention discloses a kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：Step (1):It is 2 in mass ratio by titanium dioxide and resin:100‑5:100 ratio carries out the white plastic sheet material for disperseing refining glue that material to be detected is obtained；Step (2):The white plastic sheet material is pressed into the thin slice that thickness is 0.05 0.2mm；Step (3):The light transmittance of the thin slice is determined, the absorptivity and reflectivity summation of thin slice is tried to achieve indirectly, and titanium dioxide covering power in the plastic, wherein covering power=(1 light transmittance) × 100 is characterized with the summation of absorptivity and reflectivity.It is an advantage of the invention that obtaining indirectly the summation of its absorptivity and reflectivity by determining the light transmittance of plastic tab, titanium dioxide covering power in the plastic is represented with this summation, detection method is simple and practical, testing process is short, easy to operate, financial cost is low, and the result precision for detecting is high and reproducible.
Description
Technical field
The present invention relates to field of titanium dioxide production, more particularly to a kind of detection method of titanium dioxide covering power in the plastic.
Background technology
Titanium dioxide is one of most widely used Chinese white at present, is mainly used in coating, plastics, ink, papermaking, change
In the fields such as fibre, cosmetics, wherein, plastics are the second large users of titanium dioxide, and titanium dioxide is the sustainable development of plastic industry
It is made that major contribution.In plastic industry, the covering power of titanium dioxide is one of very important index, the covering power of titanium dioxide
It is also called opacity.The application detection of titanium dioxide covering power in the plastic, can effectively improve downstream production product quality,
Titanium dioxide covering power detection in the plastic is both at home and abroad at present all without corresponding standard.
At present titanium powder plant and downstream application producer using titanium dioxide covering power detection method mainly have three kinds：The first
It is black and white lattice method, according to《The covering power assay method of GB 1709-1979 pigment》The method is judged with visual method, easily by environment
Light intensity is disturbed, easily because people cause testing result deviation very big the difference of Color perception, poor with the trade mark with producer
Not little titanium dioxide is difficult to differentiate between covering power；Second method assay method then using contrast ratio is needed titanium comparing
White powder is made mill base and is smeared on polyester film and obtains painting plate, the method tedious process, not only environmental requirement constant temperature and humidity, and paints
Film drying time at least needs 48h, extremely inefficient, and remaining mill base is difficult to increase environmental burden；The third detection method is
The non-standard method that factory uses, titanium dioxide is first made high-concentration color masterbatch and then is blow molded into film using inflation film manufacturing machine, pass through
Optical density is representing the covering power of titanium dioxide；This detection method drawback is too many, titanium dioxide agglomeration in high-concentration color masterbatch
Greatly, there is dispersion uneven, threaded rod shear shear force and number of times are not enough to be completely dispersed high-concentration titanic white powder less, so that the film of blowing
White point is there may be, the degree of accuracy of light transmittance is affected；Cumbersome, to first make Masterbatch and then want blown film；Financial cost is high,
Make Masterbatch and blown film is required for a large amount of resins；Poor repeatability, the thin film testing point of blowing are different, and result error is big.Therefore,
Exploitation is a kind of accurately, the detection method of stable, simple titanium dioxide covering power in the plastic is significant.
Content of the invention
Goal of the invention：For the problems referred to above, it is an object of the invention to provide a kind of inspection of titanium dioxide covering power in the plastic
Survey method, with solve existing detection method poor accuracy, be easily disturbed, the high, poor repeatability of cumbersome, financial cost etc. is asked
Topic.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：A kind of inspection of titanium dioxide covering power in the plastic
Survey method, comprises the following steps：
Step (1)：It is 2 in mass ratio by titanium dioxide and resin:100-5:100 ratio carry out disperse refining glue be obtained to be checked
Survey the white plastic sheet material of material；
Step (2)：The white plastic sheet material is pressed into the thin slice that thickness is 0.05-0.15mm；
Step (3)：The light transmittance of the thin slice is determined, the absorptivity and reflectivity summation of thin slice is tried to achieve indirectly, to absorb
The summation of rate and reflectivity is characterizing titanium dioxide covering power in the plastic, wherein covering power=(1- light transmittances) × 100.
By adopting above-mentioned technical proposal, as the principle of light action is, absorptivity+reflectivity+light transmittance=1, thus
Can be in the hope of, absorptivity+reflectivity=1- light transmittances, so covering power=(1- light transmittances) × 100, therefore thin according to surveyed
The light transmittance of piece can calculate the absorptivity of slice and reflectivity summation, and then extrapolate the covering power of titanium dioxide, by covering
The computing formula of power can be seen that the covering power of the more high then titanium dioxide of the light transmittance of under equal conditions thin slice is less.Thin slice saturating
Light rate has relation with the thickness of titanium dioxide and the mass ratio and thin slice of resin, finds titanium dioxide in resin by many experiments
In consumption and its covering power into approximate exponential type function, i.e., when titanium dioxide consumption is 0:100 to 2:During 100 interval increase, hide
Lid power increases rapidly, and 2:100-5:100 interval covering powers rise relatively gently, when consumption is more than 5:When 100 covering power almost without
Substantially increase, this is because the potting resin degree Different Effects of titanium dioxide, i.e., 0:100-2:100 titanium dioxides are in resin
Filling rate is relatively low, and 5:When more than 100, filling rate is intended to saturation, and 2:100-5:Certain filling is reached when 100.Therefore in order to more
The covering power of the different titanium dioxides of good comparison, chooses 2:100 to 5：Than conveniently between 100.The thickness of thin slice is directly affected
The size of light rate score, the sheet thicknesses that current market is easier to buy are more than 0.05mm, and sheet thickness should not be too thick, because
Consumption of the corresponding covering power effect of its thickness similar to titanium dioxide, i.e., when titanium dioxide consumption is certain, thickness is hidden after exceeding certain value
Gai Li is intended to complete hiding, is unfavorable for the covering power of the different titanium dioxides of comparison.The making of thin slice and obtain accurately for convenience
Thin slice light transmittance, the thickness of thin slice is located in the range of 0.05-0.15mm, according to the thickness range of thin slice by titanium dioxide
2 are set to the mass ratio of resin:100-5:100.
Further, after first will be uniform to titanium dioxide and mixed with resin in step (1), then dispersion refining glue be carried out.
By adopting above-mentioned technical proposal, because titanium dioxide is attached on resin can effectively reduce dividing for titanium dioxide in advance
Scattered difficulty, can be such that titanium dioxide is preferably dispersed in resin, disperse mixed material uniform and smooth out, obtained white modeling
Media sheet is homogeneous, makes the measurement result of light transmittance more accurate.
Further, white plastic sheet material is pressed in step (2) thin slice of the thickness using vulcanizing press.
By adopting above-mentioned technical proposal, operationally hot plate makes white plastic sheet material heat up to vulcanizing press, white modeling
Media sheet starts to soften after being heated, while the moisture content of resin and volatile material will gasify in white plastic sheet material, at this moment according to
Giving enough pressure by hydraulic cylinder makes the white plastic sheet material of softening full of model, and limits the generation of bubble, makes product group
Knit the dense requirement for reaching detection of structure.
Further, the quickly cooling device on the thin slice vulcanizing press that makes is cooled to room temperature in step (2)；
Thin slice ambient temperature and moisture is adjusted after 4h in step (3), the marginal portion of thin slice is cut out and goes to measure its light transmittance again.
By adopting above-mentioned technical proposal, due to the temperature of the thin slice that suppresses out through vulcanizing press higher, thin slice
Longer the time required to naturally cooling to room temperature, therefore thin slice can be enable to be cooled to room temperature faster with quickly cooling device；
The state that thin slice is cooled to after room temperature its own is also unstable, just can ensure that thin slice after needing to place 4h under the conditions of ambient temperature and moisture
Optimal test mode is reached, thin slice shrinks because effect of expanding with heat and contract with cold produces edge, in order to not affect to test, needs to cut out edge
Go.
Further, first white plastic sheet material is put in mould in step (2) and carry out again compressing tablet.
By adopting above-mentioned technical proposal, the size shape of the thin slice suppressed using mould is consistent, each position of thin slice
Consistency of thickness, using the condition of equivalent thickness of mould energy effective control thin slice, the titanium dioxide detected using this thin slice is in plastics
The result of middle covering power is accurately and reliably.
Further, mould described in step (2) includes upper cover plate, lower shoe and two pieces of identical sheet metals, described on
Cover plate and lower shoe are chromium plating optical flat steel plate, and two pieces of sheet metals are arranged at relative between upper cover plate and lower shoe
Both sides, the gap that two pieces of sheet metals of the upper cover plate, lower shoe and centre are formed are used for placing white plastic sheet material, described
The thickness of sheet metal is 0.05-0.15mm, the thickness of the thin slice for suppressing and the consistency of thickness of the sheet metal.
The size of light transmittance can be directly affected by adopting above-mentioned technical proposal, the thickness of thin slice, so as to dioxy can be affected
Change the size of titanium covering power result in the plastic, therefore carry out film-making from certain thickness mould, more effectively can control and really
The uniformity of the sheet thickness that is tested when different titanium dioxides compare is protected, the thickness of two pieces of sheet metals is set to 0.05-0.15mm,
The thickness of compacting thin slice out is also 0.05-0.15mm, the surface of the thin slice made to suppress using chromium plating optical flat thin plate
Flat smooth and consistency of thickness, improve the accuracy and validity of measurement result.
Further, described in step (1), titanium dioxide and resin are well-mixed in plastics or rustless steel container.
By adopting above-mentioned technical proposal, due to plastics or stainless steel both will not polymeric adsorbent, and do not result in yet
The color transfer of resin, therefore, it is possible to ensure that the mass ratio of titanium dioxide and resin keeps constant, it is ensured that resin is mutually mixed with titanium dioxide
The color of conjunction is constant all the time, makes testing result accurately and reliably.
Further, used in step (1), two-roll mill carries out dispersion refining glue to titanium dioxide and resin.
By adopting above-mentioned technical proposal, two-roll mill is good to the dispersion effect of titanium dioxide and resin, the quality of refining glue
High.
Further, the light transmittance of thin slice is determined using printing opacity analyzer in step (3).
It is applied to all transparent, translucent parallel plane samples by adopting above-mentioned technical proposal, determination of light transmittance instrument, such as
The measure of the light transmittance of plastic plate, sheet material etc., computer are automatically brought into operation, easy to use, and intelligence degree is high, using intelligent digital
Determination of light transmittance instrument can accurately measure the light transmittance of thin slice to be measured, make testing result more accurate.Determine the printing opacity of thin slice
During rate, the light transmittance on thin slice at three differences is first determined using determination of light transmittance instrument, with the light transmittance at three differences
Mean value represent thin slice light transmittance.
Further, the resin described in step (1) is thermoplastic resin.
By adopting above-mentioned technical proposal, thermoplastic resin is the big class synthesis that can be heated and softened repeatedly, cool and solidify
Resin.This resinoid, at normal temperatures for high molecular weight solid, is line style or the polymer with a small amount of side chain, intermolecular without crosslinking,
Attract each other only by van der waals force or hydrogen bond.In molding process, the pressurized heating of resin softens and flows,
Be not chemically crosslinked, the product of required form can be obtained in figuration in mould through cooling and shaping.In thermal histories repeatedly
In, molecular structure does not substantially change, when temperature is too high, overlong time when, then can degrade or decompose.Conventional heat
Plastic resin has polyvinyl chloride resin, PE resins, PC resin, PS resins, PP resins, ABS resin etc..
Beneficial effect：Compared with prior art, it is an advantage of the invention that the light transmittance of plastic tab is indirect to be obtained by determining
To its absorptivity and the summation of reflectivity, titanium dioxide covering power in the plastic is represented with this summation, detection method is simply real
With, testing process is short, easy to operate, financial cost is low, the result precision for detecting is high and reproducible.
Description of the drawings
Fig. 1 is the explosive view of the mould used by compressing tablet of the present invention；
Fig. 2 is titanium dioxide covering power schematic diagram of the present invention；
In figure, 1, upper cover plate；2nd, lower shoe；3rd, sheet metal；4th, substrate；5th, plastic tab；6th, substrate light is by plastic tab
Reflection after obstruct；7th, absorptivity；8th, the light transmittance of the light transmission plastic tab of substrate color.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is further elucidated with, it should be understood that these embodiments are merely to illustrate
The present invention rather than restriction the scope of the present invention, after the present invention has been read, those skilled in the art are each to the present invention's
The modification for planting the equivalent form of value falls within the application claims limited range.
Embodiment 1：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：The 5g country No. 1 rutile titanium-type white powder and 100g plasticized PVC resins are weighed respectively with assay balance, will
Both are well mixed in plastic cup or stainless steel cup, will No. 1 rutile type titanium white in the uniform country and plasticized PVC resins
Mixture is poured in the dispersion cylinder of two-roll mill and carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, in front and back roller
The ratio of rotating speed is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and raw material is double
The refining glue time in roller mill is 8 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white PVC sheet to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white PVC sheet is positioned over the upper cover plate of mould, lower shoe
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging
Compressing tablet is carried out, the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, and white PVC sheet is pressed into after 0.15mm thin slices,
Room temperature is restored it using the quickly cooling device on vulcanizing press；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 2：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：5g anatase thpe white powders and 100g plasticized PVC resins are weighed respectively with assay balance, both are being moulded
It is well mixed in material cup or stainless steel cup, pours uniform anatase thpe white powder and plasticized PVC resins mixture into double roller and open
The dispersion cylinder of mill carries out dispersion refining glue, and two-roll mill double roller spacing is set to 3mm, and the ratio of roller rotating speed is set to 1 in front and back:
1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and refining glue removes cooling after 4 minutes, then
After being cut into several pieces coolings, upper roller continues refining glue 4 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white PVC sheet to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white PVC sheet is positioned over the upper cover plate of mould, lower shoe
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging
Compressing tablet is carried out, the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, and white PVC sheet is pressed into after 0.15mm thin slices,
Room temperature is restored it using quickly cooling device；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 3：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：5g foreign countries No. 3 rutile titanium-type white powder and 100g plasticized PVC resins are weighed respectively with assay balance, will
Both are well mixed in plastic cup or stainless steel cup, will No. 3 rutile type titanium whites of uniform foreign countries and plasticized PVC resins
Mixture is poured the dispersion cylinder of two-roll mill into and carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, and roller turns in front and back
The ratio of speed is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and raw material is in double roller
The refining glue time in mill is 8 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white PVC sheet to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white PVC sheet is positioned over the upper cover plate of mould, lower shoe
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging
Compressing tablet is carried out, the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, and white PVC sheet is pressed into after 0.15mm thin slices,
Room temperature is restored it using the quickly cooling device on vulcanizing press；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 4：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：The 2g country No. 1 rutile type titanium white and 100g plasticized PVC resins are weighed respectively with assay balance, will
Both are well mixed in plastic cup or stainless steel cup, will No. 1 rutile type titanium white in the uniform country and plasticized PVC resins
Mixture is poured the dispersion cylinder of two-roll mill into and carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, and roller turns in front and back
The ratio of speed is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and raw material is in double roller
The refining glue time in mill is 8 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white plastic sheet material to be put in mould, mould include upper cover plate, lower shoe and
Two pieces of identical sheet metals, upper cover plate and lower shoe are chromium plating optical flat steel plate, and two pieces of sheet metals are arranged at upper and lower cover plates
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white plastic sheet material is positioned over the upper cover plate of mould, goes to the bottom
In the gap that two pieces of sheet metals of plate and centre are formed, upper and lower two pieces of chromium plating optical flats steel plate is put into compression molding after merging
Machine carries out compressing tablet, and the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, white plastic sheet material is pressed into 0.15mm thin slices
Afterwards, room temperature is restored it using quickly cooling device；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 5：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：2g anatase thpe white powders and 100g plasticized PVC resins are weighed respectively with assay balance, both are being moulded
It is well mixed in material cup or stainless steel cup, pours uniform anatase thpe white powder and plasticized PVC resins mixture into double roller and open
The dispersion cylinder of mill carries out dispersion refining glue, and two-roll mill double roller spacing is set to 3mm, and the ratio of roller rotating speed is set to 1 in front and back:
1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and refining glue removes cooling after 4 minutes, then
After being cut into several pieces coolings, upper roller continues refining glue 4 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white PVC sheet to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white PVC sheet is positioned over the upper cover plate of mould, lower shoe
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging
Compressing tablet is carried out, the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, and white PVC sheet is pressed into after 0.15mm thin slices,
Room temperature is restored it using the quickly cooling device on vulcanizing press；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 6：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：2g foreign countries No. 3 rutile type titanium whites and 100g plasticized PVC resins are weighed respectively with assay balance, will
Both are well mixed uniform external No. 3 rutile type titanium whites and plasticized PVC resins in plastic cup or stainless steel cup
Mixture is poured the dispersion cylinder of two-roll mill into and carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, and roller turns in front and back
The ratio of speed is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and raw material is in double roller
The refining glue time in mill is 8 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white PVC sheet to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white plastic sheet material is positioned over the upper cover plate of mould, lower shoe
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging
Compressing tablet is carried out, the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, and white PVC sheet is pressed into after 0.15mm thin slices,
Room temperature is restored it using quickly cooling device；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 7：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：The 2g country No. 2 rutile titanium-type white powder and 100g plasticized PVC resins are weighed respectively with assay balance, will
Both are well mixed in plastic cup or stainless steel cup, will No. 2 rutile type titanium whites in the uniform country and plasticized PVC resins
Mixture is poured in the dispersion cylinder of two-roll mill and carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, in front and back roller
The ratio of rotating speed is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 165 DEG C and 160 DEG C in front and back, and raw material is double
The refining glue time in roller mill is 8 minutes, and white PVC sheet is obtained；
Step (2)：Cut a part from white PVC sheet to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, and white plastic sheet material is positioned over the upper cover plate of mould, lower shoe
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging
Compressing tablet is carried out, the upper and lower temperature of heating plate of vulcanizing press is set as 215 DEG C, and white PVC sheet is pressed into after 0.15mm thin slices,
Room temperature is restored it using the quickly cooling device on vulcanizing press；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 8：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：5g No. 1 rutile type titanium white in the country and 100g PE resins are weighed respectively with assay balance, incite somebody to action both
It is well mixed in plastic cup or stainless steel cup, uniform domestic No. 1 rutile type titanium white and PE resin compounds is fallen
The dispersion cylinder for entering two-roll mill carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, and the ratio of roller rotating speed sets in front and back
It is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 110 DEG C and 105 DEG C in front and back, and raw material is in two-roll mill
The refining glue time be 8 minutes, white PE sheet materials are obtained；
Step (2)：A part is cut from white PE sheet materials to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, white PE sheet materials be positioned over the upper cover plate of mould, lower shoe with
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging and enters
Row compressing tablet, the upper and lower temperature of heating plate of vulcanizing press are set as 150 DEG C, and white PE sheet materials are pressed into after 0.15mm thin slices, profit
Room temperature is restored it with quickly cooling device；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 9：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：5g anatase thpe white powder and 100g PE resin are weighed respectively with assay balance, by both in plastic cup
Or be well mixed in stainless steel cup, the dispersion for pouring uniform anatase thpe white powder and PE resin compounds into two-roll mill
Cylinder carries out dispersion refining glue, and two-roll mill double roller spacing is set to 3mm, and the ratio of roller rotating speed is set to 1 in front and back:1.1, preliminary roller rotating speed
For 30r/min, roll temperature is set to 110 DEG C and 105 DEG C in front and back, and refining glue removes cooling after 4 minutes, be then cut into several pieces cold
But after, upper roller continues refining glue 4 minutes, and white PE sheet materials are obtained；
Step (2)：A part is cut from white PE sheet materials to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, white PE sheet materials be positioned over the upper cover plate of mould, lower shoe with
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging and enters
Row compressing tablet, the upper and lower temperature of heating plate of vulcanizing press are set as 150 DEG C, and white PE sheet materials are pressed into after 0.15mm thin slices, profit
Room temperature is restored it with the quickly cooling device on vulcanizing press；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 10：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：5g No. 1 rutile type titanium white in the country and 100g PC resins are weighed respectively with assay balance, incite somebody to action both
It is well mixed in plastic cup or stainless steel cup, uniform domestic No. 1 rutile type titanium white and PC resin mixture is fallen
The dispersion cylinder for entering two-roll mill carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, and the ratio of roller rotating speed sets in front and back
It is set to 1:1.1, preliminary roller rotating speed is 30r/min, and roll temperature is set to 135 DEG C and 130 DEG C in front and back, and raw material is in two-roll mill
The refining glue time be 8 minutes, white PC sheet materials are obtained；
Step (2)：A part is cut from white PC sheet materials to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, white PC sheet materials be positioned over the upper cover plate of mould, lower shoe with
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging and enters
Row compressing tablet, the upper and lower temperature of heating plate of vulcanizing press are set as 185 DEG C, and white PC sheet materials are pressed into after 0.15mm thin slices, profit
Room temperature is restored it with quickly cooling device；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 11：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：5g anatase thpe white powder and 100g PC resin are weighed respectively with assay balance, by both in plastic cup
Or be well mixed in stainless steel cup, the dispersion for pouring uniform anatase thpe white powder and PC resin mixture into two-roll mill
Cylinder carries out dispersion refining glue, and two-roll mill double roller spacing is set to 3mm, and the ratio of roller rotating speed is set to 1 in front and back:1.1, preliminary roller rotating speed
For 30r/min, refining glue is removed cooling, is then cut into upper roller after several pieces cool down and continues refining glue 4 minutes after 4 minutes, prepared white
PC sheet materials；
Step (2)：A part is cut from white PC sheet materials to be put in mould, mould includes upper cover plate, lower shoe and two
Block identical sheet metal, upper cover plate and lower shoe are chromium plating optical flat steel plate, two pieces of sheet metals be arranged at upper and lower cover plates it
Between opposite sides, the thickness of two pieces of sheet metals is 0.15mm, white PC sheet materials be positioned over the upper cover plate of mould, lower shoe with
And in the gap of two pieces of sheet metals formation of centre, upper and lower two pieces of chromium plating optical flats steel plate is put into vulcanizing press after merging and enters
Row compressing tablet, white PC sheet materials is pressed into after 0.15mm thin slices, is restored it using the quickly cooling device on vulcanizing press
Arrive room temperature；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
Embodiment 12：A kind of detection method of titanium dioxide covering power in the plastic, comprises the following steps：
Step (1)：The 5g country No. 1 rutile type titanium white and 100g plasticized PVC resins are weighed respectively with assay balance, will
Both are well mixed uniform domestic No. 1 rutile type titanium white and plasticized PVC resins in plastic cup or stainless steel cup
Mixture is poured the dispersion cylinder of two-roll mill into and carries out dispersion refining glue, and two-roll mill double roller spacing is set to 4mm, and roller turns in front and back
The ratio of speed is set to 1:1.1, preliminary roller rotating speed is 30r/min, and refining glue time of the raw material in two-roll mill is 8 minutes, is obtained
White plasticized PVC sheet material；
Step (2)：A part is cut from white plasticized PVC sheet material to be put in mould, mould includes upper cover plate, lower shoe
With two pieces of identical sheet metals, upper cover plate and lower shoe be chromium plating optical flat steel plate, and two pieces of sheet metals are arranged at upper and lower covers
Opposite sides between plate, the thickness of two pieces of sheet metals are 0.05mm, and white plasticized PVC sheet material is positioned over the upper lid of mould
In the gap that two pieces of sheet metals of plate, lower shoe and centre are formed, upper and lower two pieces of chromium plating optical flats steel plate is put into after merging
Vulcanizing press carries out compressing tablet, and white plasticized PVC sheet material is pressed into after 0.05mm thin slices, which is extensive using quickly cooling device
Room temperature is arrived again；
Step (3)：Thin slice ambient temperature and moisture is placed and is stablized after 4 hours, the thin slice of compacting is cut out and goes to marginal portion, reduce side
The uneven thickness that edge is caused because expanding with heat and contract with cold effect, when measuring thin slice light transmittance with light transmittance tester, is surveyed using light transmittance
Determine instrument and first determine light transmittance on thin slice at three differences, thin slice is represented with the mean value of the light transmittance at three differences
Light transmittance.
In embodiment 1-12, anatase thpe white powder and rutile type titanium white are carried out with two-roll mill in step (1) point
There is the dispersion condition of part different during scattered refining glue, this is due to the difficult dispersion of anatase thpe white powder, needs to improve shearing force.Different factories
Family's titanium dioxide particle size is different with coating to cause its agglomeration degree difference, the double roller shearing force needed during dispersion and shearing
Number is different, just can ensure that titanium dioxide reaches equal dispersion degree.The equal dispersion of titanium dioxide refers to shearing force in dispersion process
Reach the titanium dioxide can scattered smallest particles critical shear, then improve the dispersion that shearing force cannot also improve titanium dioxide
Degree, the colour killing ability for showing as improving in European standard shearing force titanium dioxide are no longer improved.By European standard Europe mark
Accurate《The evaluation of EN 13900-2 pigment and filler diffusivity in the plastic》Confirmed, roller bearing spacing is 3-5mm, in front and back roller
The ratio of rotating speed is 1:1-1:Between 1.1, in more than 20r/min, raw material reaches 200 turns and can reach in double roller number of turn-taking preliminary roller rotating speed
Equal degree of scatter is arrived, an experimental condition is arbitrarily improved and can be improved shearing force, it is ensured that different trade mark titanium dioxides reach
Equal dispersion degree.
Resin in embodiment 1-12 is equally applicable to the thermoplastic resins such as PS resins, PP resins, ABS resin, step (1)
In the corresponding two-roll mill of above-mentioned different resin before and after roller temperature be respectively 100 DEG C and 95 DEG C, 160 DEG C and 155 DEG C,
210 DEG C and 205 DEG C etc., in step (2) temperature of the corresponding upper and lower heating plate of vulcanizing press be respectively 140 DEG C, 210 DEG C, 245
DEG C etc..
Model PL602E of the assay balance used in embodiment 1-12, manufacturer are plum Teller-support benefit；Double
Model BL-6170A of roller mill, manufacturer are Dongguan City Bao Lun precision detecting instruments Co., Ltd；Vulcanizing press
Model BL-6170A, manufacturer be Dongguan City Bao Lun precision detecting instruments Co., Ltd；The model of determination of light transmittance instrument
For WGT-2S, manufacturer is Shanghai Shen Guang instrument and meters Co., Ltd.
Embodiment 1-12 specific experiment parameter is as follows：
| Embodiment | Titanium dioxide quality and type | Resin quality and type | Sheet thickness/mm |
| Embodiment 1 | No. 1 rutile in the 5g country | 100g plasticized PVCs | 0.15 |
| Embodiment 2 | The sharp titaniums of 5g | 100g plasticized PVCs | 0.15 |
| Embodiment 3 | No. 3 rutile of 5g foreign countries | 100g plasticized PVCs | 0.15 |
| Embodiment 4 | No. 1 rutile in the 2g country | 100g plasticized PVCs | 0.15 |
| Embodiment 5 | The sharp titaniums of 2g | 100g plasticized PVCs | 0.15 |
| Embodiment 6 | No. 3 rutile of 2g foreign countries | 100g plasticized PVCs | 0.15 |
| Embodiment 7 | No. 2 rutile in the 5g country | 100g plasticized PVCs | 0.15 |
| Embodiment 8 | No. 1 rutile in the 5g country | 100g PE | 0.15 |
| Embodiment 9 | The sharp titaniums of 5g | 100g PE | 0.15 |
| Embodiment 10 | No. 1 rutile in the 5g country | 100g PC | 0.15 |
| Embodiment 11 | The sharp titaniums of 5g | 100g PC | 0.15 |
| Embodiment 12 | No. 1 rutile in the 5g country | 100g plasticized PVCs | 0.05 |
Covering power result measured by embodiment 1-12 is as follows：
| Embodiment | Titanium dioxide covering power | Embodiment | Titanium dioxide covering power |
| Embodiment 1 | 77.7 | Embodiment 7 | 78.4 |
| Embodiment 2 | 73.1 | Embodiment 8 | 75.5 |
| Embodiment 3 | 82.2 | Embodiment 9 | 70.2 |
| Embodiment 4 | 65.5 | Embodiment 10 | 76.3 |
| Embodiment 5 | 60.3 | Embodiment 11 | 71.5 |
| Embodiment 6 | 69.3 | Embodiment 12 | 52.3 |
The detection method of the covering power in the plastic of the titanium dioxide in embodiment 1-12 carries out performance evaluation, as follows：
First, the detection of repeatability
The side that the embodiment of the present invention 1 is adopted by testing staff 1 and the country 1 of testing staff 2 couples rutile type titanium white
Method carries out the experiment of 10 groups of titanium dioxides detection of covering power in the plastic, as a result as follows：
From the above results, the repeatability of two testing staff's test results is 0.91%, it can be seen that different inspections
Survey personnel carry out the measurement result phase of the titanium dioxide test experience of covering power in the plastic to identical titanium valve with same process
Closely, illustrate that the detection method of the present invention can repeat to realize, the good stability of detection method.
2nd, method is compared
Comparative example one：Using《The covering power assay method of GB/T 1709-1979 pigment》, by pigment and inking oil grinding
Into mill base, equably it is painted on black and white lattice glass plate, so that the just covered minimum of black and white lattice represents face with amount of pigment
The covering power of material, with g/m2Represent, the more little corresponding covering power of its numerical value is bigger.For the inventive method compares titanium dioxide covering
It should be ensured that equal conditions contrast, i.e., be compared when titanium dioxide consumption is identical with thickness during power, such as the titanium in embodiment 1,2,3
White powder consumption is all 5g, and sheet thickness is all 0.15mm.To domestic No. 1 rutile type titanium white,
External No. 3 rutile type titanium whites and a collection of domestic anatase thpe white powder carry out test and obtain following result：
From the foregoing, the inventive method and standard method《The covering power assay method of GB/T 1709-1979 pigment》Knot
Really represent it is consistent, i.e., No. 3 rutile titanium dioxides of domestic anatase thpe white powder and domestic No. 1 rutile type titanium white and foreign countries
Powder is compared, and the covering power of domestic No. 1 rutile type titanium white and external No. 3 rutile type titanium whites is all higher than domestic anatase titanium dioxide titanium
The covering power of white powder；Covering power of the covering power of external No. 3 rutile type titanium whites higher than domestic No. 1 rutile type titanium white,
When using other different resins, result is equally consistent.
Comparative example two：Using《The comparison of GB/T 5211.17-1988 Chinese white contrast ratios (covering power)》, with same
Paint vehicle makes mill base sample with identical formula and method, the essentially identical paint film of thickness is obtained with spreader, measures black matrix
With the reflectivity of white background, contrast ratio is tried to achieve divided by reflectivity on white background with reflectivity in black matrix, contrast rate score is bigger, and covering is got over
Good.And contrast with the inventive method, because anatase thpe white powder is not suitable for coating article, what therefore above-mentioned contrast was used is
Domestic No. 1 rutile type titanium white and domestic No. 2 rutile titanium white powder and external No. 3 rutile type titanium whites.To three batches of titaniums
White powder test obtains following result：
From the foregoing, the inventive method and standard method《GB/T 5211.17-1988 Chinese white contrast ratios (are covered
Power) comparison》As a result consistent, i.e., the covering power of domestic No. 1 rutile type titanium white is less than domestic No. 2 rutile type titanium whites
Covering power, while the covering power of domestic No. 1 rutile type titanium white and domestic No. 2 rutile type titanium whites is below foreign countries 3
Rutile type titanium white.
Can draw from embodiment 1-12 and results of performance analysis, method of the present invention repeatability is high, and repeatability is good, adopts
With the present invention titanium dioxide in the plastic covering power method of testing test titanium dioxide covering power, its result can with announce
Covering power testing standard consistent, it was demonstrated that the detection method can effectively characterize the covering in the plastic of different titanium dioxides
Power.
The present invention uses instrument measuring method, can effectively eliminate covering power result because human factor judged result is caused
Test error, it can be seen that the inventive method degree of accuracy is high.Meanwhile, the present invention only needs 15 points from refining glue to film-making process
Clock is less than testing process painting, film relative to contrast ratio, stablizing the loaded down with trivial details flow processs such as 48 hours, substantially increase test effect
Rate, meanwhile, the resin for using is replaced compared with the more convenient adjustment of paint systems.It is thus appreciated that the method for the present invention is simple and practical,
Easy to operate, test repeatability, accuracy are high, suitably in titanium dioxide industry popularization and application.
Claims (10)
1. the detection method of a kind of titanium dioxide covering power in the plastic, it is characterised in that comprise the following steps：
Step (1)：It is 2 in mass ratio by titanium dioxide and resin:100-5:100 ratio carries out disperseing refining glue that thing to be detected is obtained
The white plastic sheet material of material；
Step (2)：The white plastic sheet material is pressed into the thin slice that thickness is 0.05-0.15mm；
Step (3)：Determine the light transmittance of the thin slice, try to achieve indirectly the absorptivity and reflectivity summation of thin slice, with absorptivity and
The summation of reflectivity is characterizing titanium dioxide covering power in the plastic, wherein covering power=(1- light transmittances) × 100.
2. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(1) after first will be uniform to titanium dioxide and mixed with resin in, then dispersion refining glue be carried out.
3. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(2) white plastic sheet material is pressed in the thin slice of the thickness using vulcanizing press.
4. the detection method of a kind of titanium dioxide according to claim 3 covering power in the plastic, it is characterised in that：Step
(2) quickly cooling device on the thin slice vulcanizing press that makes is cooled to room temperature in；Will be normal for thin slice normal temperature in step (3)
After wet regulation 4h, the marginal portion of thin slice is cut out and goes to measure its light transmittance again.
5. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(2) first white plastic sheet material is put in mould in and carry out again compressing tablet.
6. the detection method of a kind of titanium dioxide according to claim 5 covering power in the plastic, it is characterised in that：Step
(2) mould described in includes that upper cover plate, lower shoe and two pieces of identical sheet metals, the upper cover plate and lower shoe are chromium plating light
Smooth steel plate is learned, two pieces of sheet metals are arranged at the opposite sides between upper cover plate and lower shoe, the upper cover plate, lower shoe
And the gap that two pieces of sheet metals of centre are formed is used for placing white plastic sheet material, the thickness of the sheet metal is 0.05-
0.15mm, the thickness of the thin slice for suppressing and the consistency of thickness of the sheet metal.
7. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(1) titanium dioxide described in and resin are well-mixed in plastics or rustless steel container.
8. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(1) used in, two-roll mill carries out dispersion refining glue to titanium dioxide and resin.
9. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(3) light transmittance of thin slice is determined using printing opacity analyzer in.
10. the detection method of a kind of titanium dioxide according to claim 1 covering power in the plastic, it is characterised in that：Step
(1) resin described in is thermoplastic resin.
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