CN105699241A - Method for determining spreading rate of coating material for coiled materials - Google Patents
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Abstract
The invention discloses a method for determining spreading rate of a coating material for coiled materials. The method comprises the following steps: (1) weighing a pretreated substrate, and recording the weight as W1; (2) completely submerging the substrate obtained in last step, weighing the submerged substrate, and recording the weight as W2; taking out the substrate, cleanly wiping the substrate, and uniformly coating the substrate with the coating material; (3) baking the substrate obtained in last step, cooling the baked substrate to room temperature, then, weighing the substrate, and recording the weight as W3; (4) completely submerging the substrate obtained in last step, weighing the submerged substrate, and recording the weight as W4; calculating the spreading rate of the coating material according to obtained data. The method disclosed by the invention can be applied to coil coatings with relatively thin coat thickness and relatively high requirements on accuracy of the spreading rate, the test accuracy can be improved, and the operation is more convenient. According to the method disclosed by the invention, used equipment is simple, and the method is simple and easy in operation.
Description
Technical field
The invention belongs to technical field of coatings, particularly relate to the new method of testing of a kind of coatings rate for coiled material。
Background technology
The use unit of coating is in the process of application of paint, except requiring coating production enterprise and necessary quality test-data be provided, also require the every physical parameter providing product to use, wherein, important one is the theoretical spreading rate of this product, in order to calculates the amount of purchase of coating and adjusts construction cost。
Theoretical spreading rate unit in coil coating is m2μm */kg, characterization parameter is as follows: the area that 1 kilogram of coating 1 micron of paint film of coating can be coated with, unit: m2；Its inverse is (M on unit area2) it is coated with the coating content that 1 micron of paint film needs, unit: g。
Conventional coatings rate detection method is depainting weight reduction, with reference to national standard " GB/T1758-1979 (1989) weight of coated paint algoscopy ", smooth steel plate without polishing is coated with the paint film of certain thickness, certain area, after drying, its thickness is accurately measured with magnetic force film thickness gauge, being designated as h, shearing the length of side is the square of d, weighs and is designated as W1, remove the paint film (part manufacturer selects to adopt MEK (butanone)+sugar) of surface of steel plate with paint stripper, be again precisely weighed, be designated as W2。
ρ=(W1-W2)/d2×h
Spreading rate=NV/ ρ × 1000
In formula: NV is non-volatile part of coating, ρ is for being coated with film density, d2Area for model。
In practice, final spreading rate value of calculation can be had large effect by the test result of thickness, and when thickness is tested, there is the following factor affecting thickness test result: 1, the flatness of the flatness of film and substrate；2, the certainty of measurement of magnetic force film thickness gauge；3, the completeness in depainting process, paint film removed and the destructiveness to base material。
In view of this, it is necessary to provide a kind of method of testing being independent of thickness, such that it is able to avoid the measuring accuracy dependence to thickness, in order to improve accuracy and the accuracy of test。
Summary of the invention
In order to overcome the defect of prior art, it is an object of the invention to provide the assay method of a kind of coatings rate for coiled material, thus solving the measuring accuracy dependence to thickness in prior art, improve the accuracy of spreading rate test。
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows:
The assay method of a kind of coatings rate for coiled material, comprises the following steps:
The first step: being weighed by pretreated base material, weight is designated as W1；
Second step: being completely immersed in by the base material that upper step obtains in water and weigh, weight is designated as W2；After taking out above-mentioned base material wiped clean, coating is uniformly coated on base material；
3rd step: the base material upper step obtained is dried, weighs after being cooled to room temperature, and weight is designated as W3；
4th step: being completely immersed in by the base material that upper step obtains in water and weigh, weight is designated as W4；The spreading rate of coating is calculated according to the data obtained。
Described base material is aluminium flake。
The thickness of described aluminium flake is 0.4-0.6mm, and length is 8-10cm, and width is 5-8cm。
Described pretreatment is by the surface polar solvent wiped clean of base material。
Described polar solvent is at least one in butanone (MEK), butyl acetate, ethanol。
Described coating is coil coating。
Described coil coating is at least one in polyester coating, fluorocarbon coating, epoxy coating, polyurethanes coating。
The temperature of described drying is 250 DEG C～310 DEG C, and the time is 30s～120s。
The computing formula of the spreading rate of described coating is as follows:
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater,
Spreading rate=(NV/ ρIt is coated with) × 1000,
In formula: NV is non-volatile part of coating,
ρIt is coated withFor being coated with film density,
ρWaterFor the density of water,
W1For the weight of the pretreated base material of the first step,
W2The weight in water it is completely immersed in for second step base material,
W3It is the 3rd step base material Drying and cooling to the weight after room temperature,
W4It is that the 4th step base material is completely immersed in the weight in water。
Owing to adopting technique scheme, the present invention has the following advantages and beneficial effect:
The assay method for the coatings rate of coiled material of the present invention gets rid of the thickness test impact on spreading rate value of calculation in testing, to improve the degree of accuracy of test coated rate, can apply to the coil coating that film thickness is relatively low, improve accuracy and the accuracy of its test。Can also be applied to cannot accurately confirm with convex-concave surface effect the coating of thickness, test its spreading rate。Simultaneously, it is possible to use the inverse of the accurate spreading rate detected determines the thickness of consumption paint amount backward supervision coating。The method according to the invention, coating uses enterprise can determine construction cost more accurately, accurately orders coating according to precoating areal calculation consumption paint amount, it is to avoid waste simultaneously。
It is relatively thin that the assay method for the coatings rate of coiled material of the present invention can apply to thickness, requires in higher coil coating to the accuracy rate of spreading rate, it is possible to improve its test accuracy, more convenient to operate。The device simple that the assay method of the coatings rate for coiled material of the present invention uses, method is simple to operation。
Detailed description of the invention
In order to be illustrated more clearly that the present invention, below in conjunction with preferred embodiment, the present invention is described further。It will be appreciated by those skilled in the art that following specifically described content is illustrative and be not restrictive, should not limit the scope of the invention with this。
Chemical reagent used, test equipment and explaination thereof in the embodiment of the present invention:
In the embodiment of the present invention, the size of aluminium flake used can set according to the volume in waters, and benchmark is: three limits of aluminium flake do not contact waters wall, when not surfacing above, as far as possible greatly as well。
Embodiment 1
The first step: by the surface of aluminium flake that thickness to be 0.5mm, length be 9cm, width are 6cm, clean with butanone for solvent wiping, weighs, and weight is designated as W1；
Second step: be completely immersed in by the aluminium flake that upper step obtains in water and weigh, be completely immersed in by the aluminium flake that upper step obtains in water weighing is hang in water by catching on hook after spiling on aluminium sheet, and weight is designated as W2；After taking out above-mentioned aluminium flake wiped clean, with 30#Rod polyester coating is uniformly coated on aluminium flake (coating thickness be not up to coating the pin hole limit for standard, as far as possible thickness, to reach minimum error。), the coating thickness of 30# rod theory is 22um。
3rd step: the aluminium flake that upper step obtains is put into baking oven baking and reaches P.M.T, P.M.T and refer to peak metal temperature, refer to the maximum temperature reached in baking paint process, for different demands, baking temperature, the time can according to demand adjustment。In this step, the baking temperature of described aluminium flake is 260 DEG C～270 DEG C, baking time 90s～120s。Weighing after being cooled to room temperature, weight is designated as W3；
4th step: be completely immersed in by the aluminium flake that upper step obtains in water and weigh, be completely immersed in by the aluminium flake that upper step obtains in water weighing is hang in water by catching on hook after spiling on aluminium sheet, and weight is designated as W4；The spreading rate of coating is calculated according to the data obtained；
The computing formula of the spreading rate of coating is as follows:
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater,
Spreading rate=(NV/ ρIt is coated with) × 1000,
In formula: NV is non-volatile part of coating,
ρIt is coated withFor being coated with film density,
ρWaterFor the density of water, value is 1,
W1For the weight of the pretreated base material of the first step,
W2The weight in water it is completely immersed in for second step base material,
W3It is the 3rd step base material Drying and cooling to the weight after room temperature,
W4It is that the 4th step base material is completely immersed in the weight in water。
In the present embodiment, non-volatile part of described coating is 68%,
Test value is as follows:
W1=7.6362g (error 0.0001g)
W2=4.8415g (error 0.0001g)
W3=7.8475g (error 0.0001g)
W4=4.9483g (error 0.0001g)
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater}=(7.8475-7.6362)/{ [(7.8475-4.9483)-(7.6362-4.8415)]/1}=2.022g/cm3
Spreading rate=0.68/2.022 × 1000=336.3m2*μm/kg
Maximum error
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater}=(7.8476-7.6361)/{ [(7.8476-4.9484)-(7.6361-4.8414)]/1}=2.0239g/cm3
Spreading rate=0.68/2.0239 × 1000=336.0m2*μm/kg
Spreading rate error=(336.3-336.0)/336.3=0.089%
Comparative example 1
Certain coil steel coating produces line and tests coatings rate with the method for prior art, and non-volatile part of coating is 68%。
With reference to national standard " GB/T1758-1979 (1989) weight of coated paint algoscopy ", the smooth steel plate without polishing is coated with the paint film of certain thickness, certain area, after drying, its thickness is accurately measured with magnetic force film thickness gauge, being designated as h, shearing the length of side is the square of d, weighs and is designated as W1, remove the paint film (part manufacturer selects to adopt MEK (butanone)+sugar) of surface of steel plate with paint stripper, be again precisely weighed, be designated as W2。
ρ=(W1-W2)/d2×h
Spreading rate=NV/ ρ × 1000
In formula: NV is non-volatile part of coating, ρ is for being coated with film density, d2For aluminium sheet area。
The weight weighed up: (precision 0.001g) W1=12.161g (error 0.001g), W2=11.775g (error 0.001g), is 20um (error 1um) with the thickness of magnetic force film thickness gauge test, and the painting film density of calculating is:
ρ=(W1-W2)/d2× h=(12.161-11.755)/20 × 100=2.03g/cm3
Spreading rate=NV/ ρ × 1000=0.68/2.03 × 1000=335.0m2*μm/kg
The maximum error of test calculates
ρ=(W1-W2)/d2× h=(12.162-11.754)/19 × 100=2.147g/cm3
Spreading rate=NV/ ρ × 1000=0.68/2.147 × 1000=316.7m2*μm/kg
Spreading rate error is (335-316.7)/335=5.46%
Calculating by the method for comparative example 1, systematic error reaches 5%, calculates by monthly consuming coating 500T, and monthly the coating 5% ordered have reached 25T, causes great waste, and production cost remains high。The method adopting the present invention is calculated, and error is reduced to original 10%, then direct production cost have dropped 5%。
Comparative example 2
Certain building materials wrinkle coating is for the glazed tiles on roof, and owing to plate face has special wrinkle effect to use the thickness of magnetic force film thickness gauge detection can only be the thickness of wrinkle part upper end thickness highest part, the spreading rate of gained misses by a mile。
Detect according to existing detection method:
Coating solid part: 58%
ρ=(W1-W2)/d2×h
Spreading rate=NV/ ρ × 1000
In formula: NV is non-volatile part of coating, ρ is for being coated with film density, d2For aluminium sheet area。
The weight weighed up: (precision 0.001g) W1=11.945g (error 0.001g), W2=11.577g (error 0.001g), is 25um (thickness for the most protruding end of wrinkle of detection) with the thickness of magnetic force film thickness gauge test, and the painting film density of calculating is:
ρ=(W1-W2)/d2× h=(11.945-11.577)/25 × 100=1.472g/cm3
Spreading rate=NV/ ρ × 1000=0.58/1.472 × 1000=394m2*μm/kg
Embodiment 2
Certain building materials wrinkle coating is for the glazed tiles on roof, and owing to plate face has special wrinkle effect to use the thickness of magnetic force film thickness gauge detection can only be the thickness of wrinkle part upper end thickness highest part, the spreading rate of gained misses by a mile。
Method according to the present invention:
The first step: by the surface of aluminium flake that thickness to be 0.5mm, length be 9cm, width are 6cm, clean with butyl acetate for solvent wiping, weighs, and weight is designated as W1；
Second step: be completely immersed in by the aluminium flake that upper step obtains in water and weigh, be completely immersed in by the aluminium flake that upper step obtains in water weighing is hang in water by catching on hook after spiling on aluminium sheet, and weight is designated as W2；After taking out above-mentioned aluminium flake wiped clean, with 30#Rod fluorocarbon coating is uniformly coated on aluminium flake (coating thickness be not up to coating the pin hole limit for standard, as far as possible thickness, to reach minimum error。), the coating thickness of 30# rod theory is 22um。
3rd step: the aluminium flake that upper step obtains is put into baking oven baking and reaches P.M.T, P.M.T and refer to peak metal temperature, refer to the maximum temperature reached in baking paint process, produces line demand for different users, and baking temperature, the time can according to demand adjustment。In this step, the baking temperature of described aluminium flake is 290 DEG C～300 DEG C, baking time 30s～50s。Weighing after being cooled to room temperature, weight is designated as W3；
4th step: be completely immersed in by the aluminium flake that upper step obtains in water and weigh, be completely immersed in by the aluminium flake that upper step obtains in water weighing is hang in water by catching on hook after spiling on aluminium sheet, and weight is designated as W4；The spreading rate of coating is calculated according to the data obtained；
The computing formula of the spreading rate of coating is as follows:
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater,
Spreading rate=(NV/ ρIt is coated with) × 1000,
In formula: NV is non-volatile part of coating,
ρIt is coated withFor being coated with film density,
ρWaterFor the density of water, value is 1,
W1For the weight of the pretreated base material of the first step,
W2The weight in water it is completely immersed in for second step base material,
W3It is the 3rd step base material Drying and cooling to the weight after room temperature,
W4It is that the 4th step base material is completely immersed in the weight in water。
In the present embodiment, non-volatile part of described coating is 58%,
Test value is as follows:
W1=7.4221g (error 0.0001g)
W2=4.6822g (error 0.0001g)
W3=7.6534g (error 0.0001g)
W4=4.7832g (error 0.0001g)
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater}=(7.6534-7.4221)/{ [(7.6534-4.7832)-(7.4221-4.6822)]/1}=1.775g/cm3
Spreading rate=0.58/1.775 × 1000=326.7m2*μm/kg
Two kinds of calculation errors:
(394-326.7)/326.7 × 100%=20.6%
By the spreading rate assay method of the present invention, the coating quantity of required use can be calculated exactly, effectively reduce because calculating the too high great number production cost caused of error。
Comparative example 3
Certain household electrical appliances purposes steel plate coiled material manufacturer is coated with appliance finishes on matrixes for embossing, in order to ensure product quality, therefore, to assure that average film thickness reaches to specify requirement。Owing to matrixes for embossing this body facial film thickness differs, it is coated with after coating and cannot detect thickness, therefore use the consumption paint amount of every square metre to confirm that whether thickness is up to standard。And bigger according to the spreading rate error of art methods calculating, it is impossible to meet user's requirement to thickness precision。
Detect according to existing detection method:
Solid part of coating is: 65%
ρ=(W1-W2)/d2×h
Spreading rate=NV/ ρ × 1000
In formula: NV is non-volatile part of coating, ρ is for being coated with film density, d2For aluminium sheet area。
The weight weighed up: (precision 0.001g) W1=11.335g (error 0.001g), W2=10.977g (error 0.001g), is 20um (error 1um) with the thickness of magnetic force film thickness gauge test, and the painting film density of calculating is:
ρ=(W1-W2)/d2× h=(11.335-10.977)/20 × 100=1.790g/cm3
Spreading rate=NV/ ρ × 1000=0.65/1.79 × 1000=363.1m2*μm/kg
Thickness requirement according to 20um
Consumption paint amount=1000 × 20/363.1=55.08g/m2
The maximum error of test calculates
ρ=(W1-W2)/d2× h=(11.336-10.976)/19 × 100=1.895g/cm3
Spreading rate=NV/ ρ × 1000=65/1.895=343.0m2*μm/kg
Thickness requirement according to 20um
Consumption paint amount=1000 × 20/343=58.31g/m2
Consumption paint amount error is (58.31-55.08)/55.08=5.86%
Film thickness error
Minimum thickness: 20 × (1-5.86%)=18.82 μm
Maximum film thickness: 20 × (1+5.86%)=21.17 μm
Embodiment 3
Certain household electrical appliances purposes steel plate coiled material manufacturer is coated with appliance finishes on matrixes for embossing, in order to ensure product quality, therefore, to assure that average film thickness reaches to specify requirement。Owing to matrixes for embossing this body facial film thickness differs, it is coated with after coating and cannot detect thickness, therefore use the consumption paint amount of every square metre to confirm that whether thickness is up to standard。And bigger according to the spreading rate error of art methods calculating, it is impossible to meet user's requirement to thickness precision。
Method according to the present invention:
The first step: by the surface of aluminium flake that thickness to be 0.5mm, length be 9cm, width are 6cm, clean with ethanol for solvent wiping, weighs, and weight is designated as W1；
Second step: be completely immersed in by the aluminium flake that upper step obtains in water and weigh, be completely immersed in by the aluminium flake that upper step obtains in water weighing is hang in water by catching on hook after spiling on aluminium sheet, and weight is designated as W2；After taking out above-mentioned aluminium flake wiped clean, with 30#Rod epoxy coating is uniformly coated on aluminium flake (coating thickness be not up to coating the pin hole limit for standard, as far as possible thickness, to reach minimum error。), the coating thickness of 30# rod theory is 22um。
3rd step: the aluminium flake that upper step obtains is put into baking oven baking and reaches P.M.T, P.M.T and refer to peak metal temperature, refer to the maximum temperature reached in baking paint process, produces line demand for different users, and baking temperature, the time can according to demand adjustment。In this step, the baking temperature of described aluminium flake is 300 DEG C～310 DEG C, baking time 60s～70s。Weighing after being cooled to room temperature, weight is designated as W3；
4th step: be completely immersed in by the aluminium flake that upper step obtains in water and weigh, be completely immersed in by the aluminium flake that upper step obtains in water weighing is hang in water by catching on hook after spiling on aluminium sheet, and weight is designated as W4；The spreading rate of coating is calculated according to the data obtained；
The computing formula of the spreading rate of coating is as follows:
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater,
Spreading rate=(NV/ ρIt is coated with) × 1000,
In formula: NV is non-volatile part of coating,
ρIt is coated withFor being coated with film density,
ρWaterFor the density of water, value is 1,
W1For the weight of the pretreated base material of the first step,
W2The weight in water it is completely immersed in for second step base material,
W3It is the 3rd step base material Drying and cooling to the weight after room temperature,
W4It is that the 4th step base material is completely immersed in the weight in water。
In the present embodiment, non-volatile part of described coating is 65%,
Test value is as follows:
W1=7.7065g (error 0.0001g)
W2=4.9531g (error 0.0001g)
W3=7.9238g (error 0.0001g)
W4=5.0520g (error 0.0001g)
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater}=(7.9238-7.7065)/{ [(7.9238-5.0520)-(7.7065-4.9531)]/1}=1.835g/cm3
Spreading rate=0.65/1.835 × 1000=354.2m2*μm/kg
Thickness requirement according to 20um
Consumption paint amount=1000 × 20/354.2=56.47g/m2
Maximum error
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater}=(7.9239-7.7064)/{ [(7.9239-5.0521)-(7.7064-4.9530)]/1}=1.837g/cm3
Spreading rate=0.65/1.837 × 1000=353.8m2*μm/kg
Thickness requirement according to 20um
Consumption paint amount=1000 × 20/353.8=56.53g/m2
Consumption paint amount error is (56.53-56.47)/56.47=0.1%
Film thickness error
Minimum thickness: 20 × (1-0.1%)=19.98 μm
Maximum film thickness: 20 × (1+0.1%)=20.02 μm
The assay method for the coatings rate of coiled material of the present invention gets rid of the thickness test impact on spreading rate value of calculation in testing, to improve the degree of accuracy of test coated rate, can apply to the coil coating that film thickness is relatively low, improve accuracy and the accuracy of its test。Can also be applied to cannot accurately confirm with convex-concave surface effect the coating of thickness, test its spreading rate。Simultaneously, it is possible to use the inverse of the accurate spreading rate detected determines the thickness of consumption paint amount backward supervision coating。The method according to the invention, coating uses enterprise can determine construction cost more accurately, accurately orders coating according to precoating areal calculation consumption paint amount, it is to avoid waste simultaneously。
It is relatively thin that the assay method for the coatings rate of coiled material of the present invention can apply to thickness, requires in higher coil coating to the accuracy rate of spreading rate, it is possible to improve its test accuracy, more convenient to operate。The device simple that the assay method of the coatings rate for coiled material of the present invention uses, method is simple to operation。
Obviously; the above embodiment of the present invention is only for clearly demonstrating example of the present invention; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; all of embodiment cannot be given limit by the exemplified embodiment of the present invention, every belongs to apparent change that technical scheme extended out or the variation row still in protection scope of the present invention。The all documents mentioned in the present invention are incorporated as reference all in this application, as same section document is individually recited as reference such。
Claims (9)
1. the assay method for the coatings rate of coiled material, it is characterised in that: comprise the following steps:
The first step: being weighed by pretreated base material, weight is designated as W1；
Second step: being completely immersed in by the base material that upper step obtains in water and weigh, weight is designated as W2；After taking out above-mentioned base material wiped clean, coating is uniformly coated on base material；
3rd step: the base material upper step obtained is dried, weighs after being cooled to room temperature, and weight is designated as W3；
4th step: being completely immersed in by the base material that upper step obtains in water and weigh, weight is designated as W4；The spreading rate of coating is calculated according to the data obtained。
2. the assay method of the coatings rate for coiled material according to claim 1, it is characterised in that: described base material is aluminium flake。
3. the assay method of the coatings rate for coiled material according to claim 2, it is characterised in that: the thickness of described aluminium flake is 0.4-0.6mm, and length is 8-10cm, and width is 5-8cm。
4. the assay method of the coatings rate for coiled material according to claim 1, it is characterised in that: described pretreatment is by the surface polar solvent wiped clean of base material。
5. the assay method of the coatings rate for coiled material according to claim 4, it is characterised in that: described polar solvent is at least one in butanone, butyl acetate, ethanol。
6. the assay method of the coatings rate for coiled material according to claim 1, it is characterised in that: described coating is coil coating。
7. the assay method of the coatings rate for coiled material according to claim 6, it is characterised in that: described coil coating is at least one in polyester coating, fluorocarbon coating, epoxy coating, polyurethanes coating。
8. the assay method of the coatings rate for coiled material according to claim 1, it is characterised in that: the temperature of described drying is 250 DEG C～310 DEG C, and the time is 30s～120s。
9. the assay method of the coatings rate for coiled material according to any one of claim 1 to 8, it is characterised in that: the computing formula of the spreading rate of described coating is as follows:
ρIt is coated with=(W3-W1)/{[(W3-W4)-(W1-W2)]/ρWater,
Spreading rate=(NV/ ρIt is coated with) × 1000,
Wherein: NV is non-volatile part of coating, ρIt is coated withFor being coated with film density, ρWaterFor the density of water,
W1For the weight of the pretreated base material of the first step,
W2The weight in water it is completely immersed in for second step base material,
W3It is the 3rd step base material Drying and cooling to the weight after room temperature,
W4It is that the 4th step base material is completely immersed in the weight in water。
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| CN111060419A (en) * | 2019-12-27 | 2020-04-24 | 徐州卧牛山新型防水材料有限公司 | Method for testing coating rate of polyurethane waterproof coating |
| CN111060677A (en) * | 2019-12-25 | 2020-04-24 | 泉州市长兴化工材料有限公司 | Test method for rapidly detecting coating performance of sand-containing multicolor paint |
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