CN103995082A - Test method for defoaming performance of paint and test box - Google Patents
Test method for defoaming performance of paint and test box Download PDFInfo
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- CN103995082A CN103995082A CN201410161235.9A CN201410161235A CN103995082A CN 103995082 A CN103995082 A CN 103995082A CN 201410161235 A CN201410161235 A CN 201410161235A CN 103995082 A CN103995082 A CN 103995082A
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Abstract
The invention provides a test method for defoaming performance of paint and a test box, concretely, the test method comprises the following steps that: (a) a substrate and a sample to be tested in a construction state are provided, wherein the substrate has the area being the multiple of the unit area of 1.5cm<2>; (b) the sample to be tested is uniformly rolled and coated on the surface of the substrate for forming a paint film; (c) the defoaming efficiency of the paint film is tested, and in addition, the defoaming efficiency comprises the following indexes including (i) foam breaking time: the time from the breaking of the first foam to the breaking of the last foam on the surface of the paint film in the unit area of 1.5cm<2> is measured; and/or (ii) foam hole number: in the unit area of 1.5cm<2>, the measured foam breaking number after the paint film drying is the foam hole number, wherein when the foam breaking time is smaller than 30 seconds, or the foam hole number is smaller than 2, the results show that the defoaming performance of the paint is qualified. The test method provided by the invention is simple, can be easily implemented, and is suitable for fast paint performance test in construction sites and paint production lines.
Description
Technical field
The present invention relates to a kind of coating antifoam performance method that detects, particularly, relate to a kind of can be in the method for the fast detecting coating products defoaming of coating production line or working-yard.
Background technology
The chemical products that coating is a kind of easy construction, cheap, successful, value-added rates is high.The surface that it not only has the building of making, boats and ships, machinery etc. prevents corrosion, the function increasing the service life, also have decorative environment to give beautiful enjoyment or the function of eye-catching mark, along with scientific and technological development, coating progressively becomes the fine chemistry product that a kind of specificity is strong.
Bubble in coating is that insoluble gas enters among liquid under external force, and by a liquid heterogeneous system of isolation mutually.Bubble in coating is the discrete form of gas in coating liquid, and it is a kind of typical thermodynamic instability two-phase system: the existence of bubble has increased the surface area of coating system, has increased the energy of system; When after bubble-break, the total surface area of system greatly reduces, so also corresponding reduction of energy.So, exist the coating system of bubble all the time in thermodynamic (al) non-steady state.
In coating production process, bubble occurs as disturbing factor, makes coating products produce surface imperfection in the time of application, has both damaged outward appearance, also can affect anti-corrosive properties and the weatherability of film.Bubble is the embodiment of film adhesive deficiency normally, and for anticorrosive paint, it is the sign of outward appearance at first of its antiseptic power deficiency often.
Bubble has size, in bubble, can contain liquid, steam, other gas or crystal.The size of bubble is trusted in coating liquid or the pressure of gas and the degree that film is stretched to reverse jack-up for the adhesion with coating base material keeps balance in the adhesion to substrate surface, bubble more.By its form, bubble can be divided into two kinds of bubble and foams.Bubble refers to the vesicle of single spherical small air dispersion in high viscosity medium.The bubble that solvent based coating produces mostly is this type of.Foam is while appearing at medium dispersion easy to foaming, because the packed density of air is large, tend to produce a large amount of bubbles, because the density of air and liquid differs greatly, bubble can rise to liquid level soon, forms the bubble conglomerate separating with the dependence liquid film of a small amount of liquid formation.Water paint bubbles and mostly is this type of.
In current coating product inspection project, there is no the testing standard of antifoam performance, but the poor whole structure that has affected to a certain extent coating of its weatherability causing and anti-corrosive properties and aesthetic property.Therefore, this area can Fast Measurement coating antifoam performance in the urgent need to developing one, thereby differentiates the whether qualified method of coating.
In sum, this area lacks one quick defoaming detection method online, comes into the market to stop the bad product of defoaming.
If carry out conventional defoaming test, the time cycle is long again, is unfavorable for producing; The quality of a product defoaming often, after coming into the market, is passed judgment on by consumer.If the product introduction market that defoaming is bad, often needs to spend a large amount of manpower and materials and solves problem.
Summary of the invention
First aspect present invention, provides a kind of method of testing of coating antifoam performance, and whether described method is qualified for testing the antifoam performance of described coating, comprises step:
(a) provide the testing sample under a substrate and Construction State, the area that wherein said substrate contains 1.5cm2 unit's multiple;
(b) described testing sample even roller is applied to described substrate surface, thereby forms paint film;
(c) measure the defoaming effectiveness of described paint film, and described defoaming effectiveness comprises following index:
(i) the broken bubble time: measure first bubble-break of coating surface described in 1.5cm2 unit area to the time of last bubble-break; And/or
(ii) abscess number: measure in 1.5cm2 unit area, after drying varniss, the quantity of broken bubble is described abscess number;
Wherein, be less than 30 seconds when the described broken bubble time, or described abscess number is less than 2, shows that the antifoam performance of described coating is qualified.
In another preference, the antifoam performance of described coating comprises the defoamer performance adding in described formulation for coating material.
In another preference, the length of described 1.5cm2 unit area and wide can be 1cm × 1.5cm.
In another preference, described coating comprises any coating products that can roller coat; Preferably, described coating products that can roller coat comprises water-based or oil paint product, for example, and latex paint, woodcare paint etc.
In another preference, described substrate comprises sheet asbestos, putty plate.
In another preference, the testing sample under described Construction State refers to coating stoste to can be used for after dilution proportion the coating sample of construction.
In another preference, described dilution proportion, for to press coating stoste weighing scale, adds the thinning agent of 10%-25%, preferably, is 15%-20%.
In another preference, described thinning agent is water.
In another preference, also comprise the defoamed ratio of the described testing sample of further mensuration, wherein, described defoamed ratio is measured by following steps:
(a1) provide a container, described container contains diluted coating stoste as testing sample, and record described testing sample leave standstill time liquid level A;
(b1) described testing sample is carried out to the stirring 1-3 minute of 2000rpm, and the liquid level of record after stirring is B;
(c1) to adding the corresponding defoamer of described sample in the testing sample through stirring in (b1), and the liquid level recording after 1-3 minute after froth breaking is C,
(d1) calculate defoamed ratio E according to formula I:
Wherein, when defoamed ratio, E is greater than 85%, is preferably greater than 88%, is more preferably greater than 90%, while being greater than 95% best, shows that the antifoam performance of described coating is qualified.
In another preference, described testing sample is 25-100g, is preferably 50-75g.
In another preference, the dilution process of described diluted coating stoste is as follows: press coating stoste weighing scale, coating stoste: thinning agent=1:0.5-1:2, preferably, is 1:0.75-1:1.25, more preferably, is 1:1.
Second aspect present invention, provides a kind of coating antifoam performance Quick testing box, and described testing cassete comprises following assembly:
(i) there is the substrate of 1.5cm2 unit's multiple area;
(ii) roller coating device;
(iii) operation instructions; With optional
(iv) timing or counting assembly.
In another preference, in described operation instructions, record the method described in first aspect present invention.
In another preference, described roller coating device comprises roller, paint brush.
In should be understood that within the scope of the present invention, above-mentioned each technical characterictic of the present invention and can combining mutually between specifically described each technical characterictic in below (eg embodiment), thus form new or preferred technical scheme.As space is limited, tire out and state no longer one by one at this.
Embodiment
The inventor, through extensively and in depth research, has developed a kind of method of the Fast Measurement latex paint antifoam performance that can be used in production line or working-yard first.The inventive method is simple to operate, standard is easy to identification, and can effectively distinguish the qualified and underproof coating of antifoam performance, can be widely used in coating material production field, and the standard of coating material production is further limited, thereby the oeverall quality of raising coating material production.
Term
As used herein, term " under Construction State " refers to coating products according to manufacturer's construction suggestion, within the scope of dilutable reasonable dilution ratio, dilute, on meet the construction medium of execution conditions, the state of the condition construction requiring according to job specifications.
As used herein, term " defoamer adding in formulation for coating material ", " the corresponding defoamer of sample " are used interchangeably, and refer in prior art and different coating products compatibilities and the relatively-stationary defoamer kind of proportioning.For the formula that contains more surfactant and emulsion in system, due to more surfactant, in system, easily produce bubble, thus should select froth breaking and press down the good product of bubble effect, such as the product of the siliceous class of mineral oil; In system, the content of surfactant and emulsion is less, produces the quantity of bubble or less in system, just can select the product of general mineral oils.Therefore,, because the composition of of a sort defoamer is also to have larger difference, the result of actual test of the present invention can be used for passing judgment on the result of use of defoamer.Visible the inventive method can be used for further identifying that whether the selection of conventional compatibility defoamer is suitable, thereby further adjusts selection and the proportioning of defoamer in formulation for coating material.
As used herein, term " coating stoste " refers to after coating manufacturers produce coating, through airtight or non-enclosed package, can be directly used in the coating finished product of construction before dispatching from the factory or before construction.
The generation of coating bubble and impact thereof
Bubble in latex paint is mainly created in three links of subordinate: production run, filling and transportation, work progress.
Produce: in dispersion machine, mix various raw materials with high shear force, air can be sneaked into entrained air in slurry and can greatly reduce production efficiency.Coating is to be made up of various raw materials, and raw material can be divided into: color stuffing, polymer emulsion, water and various auxiliary agent.Under high shear color stuffing is distributed in water, adds afterwards emulsion.In high speed dispersion process, need to add wetting agent to reduce the viscosity of slurry, wetting agent has surfactivity, therefore will likely form a large amount of bubbles.Add defoamer can prevent bubble in the grinding stage, like this color stuffing (pigment in coating generally refers to: rutile titanium white powder, anatase thpe white powder, lithopone, lithopones etc. play covering in coating; Filler generally refers to: calcined kaolin, and water-washed kaoline, calcium carbonate, talcum powder, the materials such as mica powder can play the effect of skeleton in coating, increase the effect such as richness of film).Just can better disperse.The emulsion that coating uses, in the process of polymerization, can use surfactant, therefore in coating, can play the effect of stable foam.
Packaging and transport: coating just must be packed in suitable packaging once mixing up.For coating is packed in packaging, coating planted agent few bubble that contains of trying one's best, because bubble can affect the weight of density and then impact packaging.In the process of transport, vibrations and shake can be also that coating produces bubble.
Construction: in coating application process, bubble can enter paint film, if bubble can not break fast, paint film, in dry process, is the residual pin hole that wherein forms of bubble.Such paint film can be because affect outward appearance and thereby performance can not be accepted by consumer.This is also the topmost reason that present stage latex paint product generation is complained.
The most important thing is, the surface drying of general latex paint paint film is all within 1 minute, the present invention finds, if bubble can not be vanished and be talked about completely in 30S, along with being progressively dried of paint film, surface at paint film can leave pin hole, and the paint film that can affect coating is attractive in appearance, and the performance such as the washability to paint film produces adverse influence in addition; If exterior coating, the rainwater of metope may enter along pin hole the inside of paint film, causes paint film bubbling, and adhesion declines, and serious words can cause pull-away; If bubble is too much, more can aggravate the impact of above-mentioned unfavorable aspect.
The inventive method
The invention provides and a kind ofly can be used for using before product export or at the construction field (site), for the method for Fast Measurement coating antifoam performance.Described method comprises step:
(a) provide the testing sample under a substrate and Construction State, the area that wherein said substrate contains 1.5cm2 unit's multiple;
(b) described testing sample even roller is applied to described substrate surface, thereby forms paint film;
(c) measure the defoaming effectiveness of described paint film, and described defoaming effectiveness comprises following index:
(i) the broken bubble time: measure first bubble-break of coating surface described in 1.5cm2 unit area to the time of last bubble-break; And/or
(ii) abscess number: measure in 1.5cm2 unit area, after drying varniss, the quantity of broken bubble is described abscess number;
Wherein, be less than 30 seconds when the described broken bubble time, or described abscess number is less than 2, shows that the antifoam performance of described coating is qualified.
In addition, the inventive method also comprises the mensuration to described testing sample defoamed ratio, comprises step:
(a1) provide a container, described container contains diluted coating stoste as testing sample, and record described testing sample leave standstill time liquid level A;
(b1) described testing sample is carried out to the stirring 1-3 minute of 2000rpm, and the liquid level of record after stirring is B;
(c1) to adding the corresponding defoamer of described sample in the testing sample through stirring in (b1), and the liquid level recording after 1-3 minute after froth breaking is C,
(d1) calculate defoamed ratio E according to formula I:
Wherein, when defoamed ratio, E is greater than 85%, is preferably greater than 88%, is more preferably greater than 90%, while being greater than 95% best, shows that the antifoam performance of described coating is qualified.
In above-mentioned steps, the corresponding defoamer of various coating that the defoamer adding is well known to those skilled in the art.Due in the art, the corresponding defoamer of different coating has relatively-stationary kind collocation and proportioning, therefore, term " the corresponding defoamer of sample " be in the art fix and clearly.In order to further illustrate, the present invention can with the compatibility of the corresponding defoamer of sample include, but is not limited to:
Wherein, PVC refers to coating pigment volume concentration (PVC), PVC=color stuffing cumulative volume/(color stuffing cumulative volume+paint base total solid capacity)
=∑M?i/R?i/(∑M?i/r?i+∑Mj/R?j)
In formula, M i: color stuffing quality; M j: paint base (resin) quality; R i: color stuffing density; R j: paint base (resin) density.I=1～n, represents the kind of different color stuffings; J=1～m, represents the different kinds of painting bases.Wherein: paint base (resin) quality and density all refer to the numerical value (if emulsion, its density refers to dry paint density, now paints amass=quality of the emulsion × solid content/emulsion dry film density of matrix) of hard resin.Obtain after PVC value, change 0～100%, the size of value can have influence on the performance of film.From 0 to 100% time, film is (from painting base completely to complete face, filler) from an extremity to another extremity, in this process, and the general following variation of film performance: 1. wearing quality, moisture-proof, anticorrosive property, glossiness are from high to low; 2. blister resistance, perviousness, toughness, contrast ratio are from low to high.
Beneficial effect of the present invention
The inventive method can be measured fast, easily the antifoam performance of coating before product export or after arriving construction site.The inventive method has been filled up in this area the blank without standard to coating antifoam performance, by the exploration to experimental result, determine the standard of weighing antifoam performance quality, can evaluate availability and the effect of defoamer and the specific compatibility of coating, and further for the production of the product quality inspection of manufacturer, be conducive to the quick discriminating to product quality.
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.The experimental technique of unreceipted actual conditions in the following example, conventionally according to normal condition, or the condition of advising according to manufacturer.Unless otherwise indicated, otherwise number percent and umber are percentage by weight and parts by weight.
Embodiment 1
The present embodiment has been measured the antifoam performance substandard product and the performance test contrast of specification product in simulation practical application that utilize the inventive method to identify.
Wherein, detection method of the present invention is tested according to the method described in GB-T9755-2001 exterior wall coating material of synthetic resin emulsion and GB-T9756-2009 resin latex dope, but test sample plate, not according to state's calibration method preparation, is carried out the test of above-mentioned Detection of content by the model of men working ahead test.
There is above-mentioned experimental result visible, through after national standard test, the defoaming specification product definite according to the inventive method, and do not meet between the defoaming substandard product that the inventive method settles the standard, there is obvious performance difference.Therefore, the inventive method can be used for the antifoam performance of Accurate Determining coating.
All documents of mentioning in the present invention are all quoted as a reference in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read above-mentioned instruction content of the present invention, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
1. a method of testing for coating antifoam performance, whether described method is qualified for testing the antifoam performance of described coating, it is characterized in that, comprises step:
(a) provide the testing sample under a substrate and Construction State, the area that wherein said substrate contains 1.5cm2 unit's multiple;
(b) described testing sample even roller is applied to described substrate surface, thereby forms paint film;
(c) measure the defoaming effectiveness of described paint film, wherein said defoaming effectiveness comprises following index:
(i) the broken bubble time: measure first bubble-break of coating surface described in 1.5cm2 unit area to the time of last bubble-break; And/or
(ii) abscess number: measure in 1.5cm2 unit area, after drying varniss, the quantity of broken bubble is described abscess number;
Wherein, be less than 30 seconds when the described broken bubble time, or described abscess number is less than 2, shows that the antifoam performance of described coating is qualified.
2. the method for claim 1, is characterized in that, described substrate comprises sheet asbestos, putty plate.
3. the method for claim 1, is characterized in that, the testing sample under described Construction State refers to coating stoste to can be used for after dilution proportion the coating sample of construction.
4. method as claimed in claim 3, is characterized in that, described dilution proportion, for to press coating stoste weighing scale, adds the thinning agent of 10%-25%, preferably, is 15%-20%.
5. the method for claim 1, is characterized in that, also comprises the defoamed ratio of the described testing sample of further mensuration, and wherein, described defoamed ratio is measured by following steps:
(a1) provide a container, described container contains diluted coating stoste as testing sample, and record described testing sample leave standstill time liquid level A;
(b1) described testing sample is carried out to the stirring 1-3 minute of 2000rpm, and the liquid level of record after stirring is B;
(c1) to adding the corresponding defoamer of described sample in the testing sample through stirring in (b1), and the liquid level recording after 1-3 minute after froth breaking is C,
(d1) calculate defoamed ratio E according to formula I:
Wherein, when defoamed ratio, E is greater than 85%, is preferably greater than 88%, is more preferably greater than 90%, while being greater than 95% best, shows that the antifoam performance of described coating is qualified.
6. method as claimed in claim 5, and be, described testing sample is 25-100g, is preferably 50-75g.
7. method as claimed in claim 5, is characterized in that, the dilution process of described diluted coating stoste is as follows: press coating stoste weighing scale, coating stoste: thinning agent=1:0.5-1:2, preferably, is 1:0.75-1:1.25, more preferably, is 1:1.
8. a coating antifoam performance Quick testing box, is characterized in that, described testing cassete comprises following assembly:
(i) there is the substrate of 1.5cm2 unit's multiple area;
(ii) roller coating device;
(iii) operation instructions; With optional
(iv) timing or counting assembly.
9. testing cassete as claimed in claim 8, is characterized in that, has recorded method claimed in claim 1 in described operation instructions.
10. testing cassete as claimed in claim 8, is characterized in that, described roller coating device comprises roller, paint brush.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410161235.9A CN103995082A (en) | 2014-04-21 | 2014-04-21 | Test method for defoaming performance of paint and test box |
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| CN201410161235.9A CN103995082A (en) | 2014-04-21 | 2014-04-21 | Test method for defoaming performance of paint and test box |
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Cited By (5)
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| CN107192792A (en) * | 2017-05-26 | 2017-09-22 | 佛山柯维光电股份有限公司 | A kind of efficiently quick method for determining water paint defoaming characteristics |
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| CN113092388A (en) * | 2019-12-23 | 2021-07-09 | 万华化学集团股份有限公司 | Method for quickly judging and controlling color of real stone paint or improving initial performance |
| CN114264797A (en) * | 2021-11-09 | 2022-04-01 | 江苏徐工工程机械研究院有限公司 | System and method for detecting foam inhibition and defoaming |
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| CN113092388A (en) * | 2019-12-23 | 2021-07-09 | 万华化学集团股份有限公司 | Method for quickly judging and controlling color of real stone paint or improving initial performance |
| CN114264797A (en) * | 2021-11-09 | 2022-04-01 | 江苏徐工工程机械研究院有限公司 | System and method for detecting foam inhibition and defoaming |
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