In this section, parameter values are discussed of the evaporation model, which describes the inhalation exposure to vapours.
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In the evaporation model, the application duration (the time someone is painting) is one of the parameter values, just like the exposure duration (the time someone is exposed to the vapours). Usually the room in which painting has been taken place, will be left after painting. It is assumed that after painting the room is cleaned up and that the room is left afterwards. The exposure duration is set at 1.1 times the application duration, to account for the clean-up time.
The mass transfer rate is determined by the rate at which the compound is transported away from the evaporation surface. In general this transport will depend on the rate of diffusion of the compound through air, and the rate of air movement above the product-air surface.
Langmuir’s method effectively assumes that diffusion of the compound is infinitely fast. It will as a rule highly overestimate the evaporation rate and predict higher peak concentrations than the Thibodeaux approximation. Thibodeaux’ method is a simple approximation of the more elaborate Liss-Slater two-layer model, describing the evaporation of a compound from water.
Mass transfer rates calculated using the Thibodeaux’ method will be lower than the ones calculated by Langmuir’s method, but it should be remembered that this method is only an approximation of a specific system (evaporation of a solute from water) and has limited validity outside the domain for which it was derived.
Therefore the Langmuir’s method is set as default method, except in waterborne systems, then Thibodeaux’ method is chosen.
The molecular weight of the matrix (or: mol weight matrix) is the weighted average of the matrix, which contains the chemical of interest.
If the product is a mixture of compounds in the evaporation model the parameter ‘mol weight matrix’ has to be specified. In a mixture of compounds the evaporation of a specific compound depends on the partial equilibrium vapour pressure of the compound in the mixture Peq. The latter is approximated by Raoult’s law:
Peq=(PvapCvCv+CrMMr), where: Pvap:saturated vapour pressure of the compound as a pure substance[Pa]M:molecular weight of the compound[kg/mole]Cv:concentration of the compound in the product[kg/m3]Cr:concentration of the rest of the material in the product[kg/m3]Mr:mol weight matrix, average molecular weight of the rest of the material[kg/mole]The mol weight matrix Mr is determined from the molecular weights and concentrations of the product ingredients as:
CrMr=(1−wf)×ρMr=∑iCiMi=∑iwi×ρMi and thus: Mr=1−wf∑iwiMi where the index i refers to the ingredients of the rest of the material and ρ is the mass density of the total product (including the compound of interest) and wf is the weight fraction of the compound in the product [unit: fraction].Raoult’s law is valid only for ideal, non-interacting liquids and constitutes only an approximate description of a real situation.
If the composition of a paint product is known, the ‘mol weight matrix’ can be calculated with the formula above.
Mostly the mol weight and the concentration of all components of a paint product are unknown. For this situation, default values are derived.
For the calculation of the mol weight of the matrix two situations have to be distinguished:
the main solvent in the paint is the compound of interest;
the main solvent is not the component of interest.
In the formula for the mol weight matrix (see above) only compounds with relatively low mol weights, which occur in relative high concentrations in a paint product, make a valuable contribution to the ∑iwiMi. If the mol weight of components in paint products is very high, like binders, the contribution to ∑iwiMi can be neglected, compared to solvents, which occur mostly in about the same quantities.
The mol weight of binders in a solvent rich paint is ca 3,000-5,000 g/mol; in waterborne paints about 500.000a), b). The mol weight of solvents in solvent rich paint is in the order of magnitude of 140 g/mol. In waterborne paint, water (mol weight: 18 g/mol) is of course the main solvent.
The concentration of the compound of interest (wf), which is not the main solvent, will be almost always smaller than 10 %. For the calculation of the default value of the mol weight matrix wf can be neglected with respect to 1; or 1-wf ≈ 1.
Mol weight matrix≈1∑iwiMiIn paint products, compounds with mol weights substantially lower than the main solvent will usually not occur. The value of ∑iwiMi depends mostly on the main solvent.
For the calculation of the default value of the mol weight matrix the contribution of the other solvents may usually be neglected. This means that mol weight matrix≈Mmain_solventwmain_solvent
Based on these assumptions default values for the mol weight matrix are calculated for the different types of paint products, the default values are described in .
If the main solvent in the paint is the compound of interest, ∑iwiMi of the other compounds in the paint usually will be very small, because the concentration wi of other solvents, if available, will be relatively small with respect to the main solvent. Components, which can occur in quantities comparable with the contribution of the main solvent in the paint (such as binders), mostly have (very) large mol weights.
In this case, it is assumed that the vapour pressure of the main solvent is not influenced by the other compounds in the paint. In the formula this assumption is expressed in a value for the mol weight matrix of g/mol (see ).
Default values mol weight matrix, when the compound of interest is the main solvent and when the compound of interest is not the main solven.
To calculate the inhalation exposure of compounds from paint products, models which describe the evaporation of compounds from a mixture of liquids will be used. The evaporation from drying paint products can be estimated with these models. These models are not suitable to estimate the emission of compounds from hardened paint products
To describe the dermal exposure during brushing or rolling paint products the ‘constant rate model’ from ConsExpo is used.
For this model the parameter ‘contact rate’ is required. The contact rate is the rate at which the product is applied to the skin, in weight per time unit. The ‘constant rate model’, is described in detail in Delmaar et al.2)
In the Technical Notes for Guidance1) dermal exposure values are described of experiments with brushing and rolling of wood preservatives and antifouling by consumers (see ).
In the TNsG brushing and rolling of wood preservatives and antifouling is described, not the brushing and rolling of paint products. The dermal exposure during brushing / rolling of paint products will depend on the viscosity of the paint. If a type of paint is more viscous (i.e. thicker) it is assumed that the dermal exposure will be smaller. Usually the viscosity of wood preservatives will be lower than paint products.
It is assumed that the viscosity of wood preservatives will be in the same order of magnitude as a low viscous paint product like varnish, and that the viscosity of antifouling is comparable to paint products.
Dermal exposure during brushing / rolling will depend on the position of the user, as can be demonstrated for wood preservatives from . This will apply to paint products too. If someone is painting overhead (the ceiling) the dermal exposure will be substantially higher than when painting downwards (the floor) or painting directed to the side (a wall). Therefore for the default values a distinction is made between painting overhead and ‘other directions’ (downward painting and painting directed to the side). Only for painting overhead a distinction is made between low viscous paint products and ‘other paints’, for downward painting and painting directed to the side, this could not be done due to a lack of information. Therefore it is assumed that dermal exposure during downward painting and painting to the side is the same for both low viscous paint products and other paints (see ).
Dermal exposure during brushing and rolling of wood preservatives and antifouling.
During painting overhead predominantly the hands will be dermally exposed. For wood preservatives and antifouling more than 80 % of the total dermal exposure is onto hands (see ). When painting to the side this percentage ranges from 20 to 40 %.
To get an idea of the quantity of paint, which ends up on the hands during painting, a few simple experiments were executed. One hand was stained with poster paint.
It was attempted to stain the hand slightly, moderately and seriously. ‘Slightly stained’ means only some small paint spots. The hand stained in a high amount, which usually will not occur, is defined as ‘seriously stained’. The quantity of paint to stain the hand was measured. The measurements were executed twice with blue and with white paint. The quantity of paint on a slightly stained hand was circa 50 mg, on the moderately stained hand circa 150 mg, and on the seriously stained hand circa 800 mg.
If during painting the quantity of paint on the hands will be larger, the hands will be cleaned or wiped off anyhow. It is assumed that when a hand is ‘seriously stained’ with paint (more than about 1 g of paint) the hand will be cleaned or wiped off. Cleaning of the hands is not taken into account in the exposure values for wood preservatives and antifouling as described in . As described before, it is assumed that consumers do not wear gloves during painting. For the default values of the dermal exposure during brushing and rolling of paint products, cleaning of the hands has to be taken into account in the default values. Based on the data above, default values for dermal exposure during brushing and rolling of paint products are described in . The default values in for the higher exposures levels are somewhat smaller than the corresponding (75th percentile) values in , due to cleaning of the hands. Otherwise, the exposure estimate would become unrealistic.
Default values for the ‘contact rate’ during brushing and rolling of paint products.
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Market Size and Forecast (-):
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What are the Type driving the growth of the Texanol Ester Alcohol Market?
Growing demand for below Type around the world has had a direct impact on the growth of the Texanol Ester Alcohol Market:
Purity ?98%, Purity <98%
What are the Applications of Texanol Ester Alcohol Market available in the Market?
Based on Application the Market is categorized into Below types that held the largest Texanol Ester Alcohol Market share In .
Coating, Latex Paint, Other
Who is the largest Manufacturers of Texanol Ester Alcohol Market worldwide?
Eastman, Monument Chemical, Hongye High-Tech, Runtai Chemical
Short Description About Texanol Ester Alcohol Market:
The global Texanol Ester Alcohol Market is anticipated to rise at a considerable rate during the forecast period, between and . In , the market is growing steadily, and with the increasing adoption of strategies by key players, the market is expected to rise over the projected horizon.
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Which regions are leading the Texanol Ester Alcohol Market?
1. Introduction of the Texanol Ester Alcohol Market
2. Executive Summary
3. Research Methodology of Verified Market Reports
4. Texanol Ester Alcohol Market Outlook
5. Texanol Ester Alcohol Market, By Product
6. Texanol Ester Alcohol Market, By Application
7. Texanol Ester Alcohol Market, By Geography
8. Texanol Ester Alcohol Market Competitive Landscape
9. Company Profiles
10. Appendix
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