CN1102624C - Diluent for polyester paint - Google Patents

Abstract

The present invention relates to a diluent for polyester paint, which belongs to the field of organic chemical industry products. The diluent is prepared from organic acid ester, alkoxy compound, linear chain ketone, monobasic alcohol, solvent oil, etc. The diluent does not contain cyclohexanone and has the characteristics of low toxicity and good dilution performance. The diluent is favorable to labor protection and environmental protection. The diluent is suitable for dissolving and diluting various kinds of polyester paint.

Description

Diluent for polyester paint

The invention belongs to organic chemical industry's product technical field, relate to a kind of thinner that is mainly used in polyester lacquer class.

Though unsaturated polyester varnish belongs to solvent-free paint, in order to be beneficial to spraying application and the levelling of filming, past contact will be added the thinner with the suitable value of lacquer amount in lacquer, be commonly called as " solvent or diluent " when being used for woodwork coating.Existing market polyester lacquer on sale is made up of pimelinketone, N-BUTYL ACETATE and toluene or dimethylbenzene equal solvent with solvent or diluent is many, pimelinketone composition in the prescription is except that costing an arm and a leg, also has stronger toxicity, it gently then has the anesthesia restraining effect to human central nervous, heavy then can damage blood vessel, cause organ disease and cerebral lesion in the body, or by skin absorption cause human body tremble anesthesia, body temperature reduce, eventually to death.In addition, all contain dimethylbenzene or toluene more than 60% at present in the known commercially available solvent or diluent prescription, benzene also can produce very big harm to human body, and this is well-known.

The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of need not or as far as possible few with toxicity than the strong solvent diluent for polyester paint of cyclohexanone solvent particularly.

As everyone knows, the glad reason of using pimelinketone of common people is in that it has the strongest solvency power and slower evaporation rate with respect to other solvent (as acetone, butanone, sym.-diisopropylideneacetone, N-BUTYL ACETATE equal solvent) in as the solvent or diluent of thinner with dimethylbenzene under the regular situation.But the present patent application people is by serious analysis, discussion and summary to relevant theory and practice, think that we can find better composition of matter to replace the effect of pimelinketone in solvent or diluent, that is to say, we can improve existing polyester lacquer with the solvent or diluent solvency power and when increasing its levelling property, adopt nontoxic or low poison solvent as far as possible, produce the new polyester lacquer that meets healthy trend of human security and environmental regulation requirement thus and use thinner, and this purpose also of the present invention just.

Calculation formula according to the mixed solvent solubility parameter ${\mathrm{\δ}}_{\mathrm{mix}}=\frac{N_1{V}_1{\mathrm{\δ}}_1+N_2{V}_2{\mathrm{\δ}}_2+N_3{V}_3{\mathrm{\δ}}_3+\·\·\·}{N_1{V}_1+N_2{V}_2+N_3{V}_3+\·\·\·}------\left(1\right)$ δ in the formula _Mix---the solubility parameter of mixed solvent

The molar fraction of N---each solvent

The molecular volume of V---each solvent

The total rate of volatilization calculation formula of the solubility parameter of δ---each solvent and mixed solvent

R _Always=C ₁r ₁R ⁰ ₁+ C ₂r ₂R ⁰ ₂+ C ₃r ₃R ⁰ ₃+ ... (2) R in the formula _Always---the total rate of volatilization of mixed solvent

C---the volumetric concentration of each solvent composition in the mixed solvent

R---the reactivity coefficient of each solvent composition in the mixed solvent

R ⁰---the pure rate of volatilization of each solvent composition in the mixed solvent, with relevant numerical value generation as go in (1), (2) formula to find the solution, should consider the influence of various factorss such as the effect of the effect of hydrogen bond between solvent, intermolecular association force, Fan Shi power and molecular weight, surface tension, temperature, humidity during actual preparation, again solving result be revised.The applicant has made and has finished the technical solution that realizes the object of the invention in view of the above.The main points of this technical scheme are:

One, adopt straight chain ketone substituted cyclohexanone to reduce toxicity in the solvent or diluent prescription:

Because it is bigger that ketones solvent and the esters solvent of suitable carbonatoms have been compared thinning ratio, proportion is less to hang down characteristics such as being beneficial to levelling with system lacquer back viscosity, so this kind solvents of using in solvent or diluent more, no matter it still can both make user's income on the spray area under the unit weight from solvability, but because naphthenone and side chain ketone do not meet environmental regulation (66 rules of being worked out the eighties as the U.S. etc.) in some developed countries, its application is restricted, for the defective that remedies without pimelinketone does not cause salient featuress such as solvent or diluent solvency power and levelling property to descend, the present invention adopts straight chain ketone such as acetone, butanone, pentanone, hexanones etc. are added on solvent or diluent, straight chain ketone is pressed (1), (2) after the formula calculated amount adds solvent or diluent, received good effect in actual applications.

Two, in prescription, use the alkoxy compound solvent to reduce benzene class consumption and to improve the thinning ratio and the solvency power of solvent or diluent:

Alkoxy compound such as methylene diethyl ether or methoxy ethoxy methane etc., its general formula is ROCH ₂-OR ', R and R ' they are that carbon number is 1～3 alkyl in the formula, they can be identical alkyl, also can be different alkyl.The toxicity of alkoxy compound solvent such as methylene diethyl ether solvent is atomic, the polyester lacquer there is solvency power preferably, and low price, in the solvent or diluent prescription, can use in a large number, thereby not only can reduce the consumption of N-BUTYL ACETATE and pimelinketone, also can reduce the consumption of virose benzene kind solvent, in addition, because the relatively large use of alkoxy compound in solvent or diluent, the thinning ratio of solvent or diluent is significantly risen, so useable solvents oil and alcoholic solvent replace toluene or dimethylbenzene in the known products prescription, so also created prerequisite with the preparation of solvent or diluent with regard to the polyester lacquer that does not have pimelinketone for no benzene.

Three, in prescription, use lactic acid ester compound or diester compounds to adjust the rate of volatilization of solvent or diluent:

In order to remedy the low rate of volatilization of pimelinketone, in diluent for polyester paint prescription of the present invention, adopted lactic acid ester compound (as ethyl lactate) or diester compounds (as diisooctyl sebacate), their chemical general formula is respectively R ₁-CHOH-COOR ₃And R ₃-OCOR ₄-COOR ₅, R in the formula ₁Be that carbon number is 1～2 alkyl, R ₂Be that carbon number is 1～5 alkyl, R ₃And R ₅Be that carbon number is 1～3 alkyl, R ₄Be that carbon number is 1～3 alkyl or phenyl ring base.In the enforcement, above-mentioned ester class thing can be used wherein a kind of, also can be with two or more.Behind an amount of these ester class things of adding, except that the rate of volatilization that can reduce mixed solvent, also favourable in the solvent or diluent mixed solution to plasticity and the paint film adhesion that increases resin.In addition, this kind solvent is compared with pimelinketone, and its toxicity is also wanted little much less.

The diluent for polyester paint of design is a kind of composition that contains main solvent, solubility promoter and thinner three partial solvents according to above-mentioned technical scheme design, and wherein main solvent is by N-BUTYL ACETATE (CH ₃-COOC ₄H ₉), vinyl acetic monomer (CH ₃-COOC ₂H ₅), alkoxy compound (ROCH ₂-OR '), lactic acid ester compound (R ₁-CHOH-COOR ₂) or diester compounds (R ₃-OCOR ₄-COOR ₅), straight chain ketone such as compositions such as acetone, butanone, its content accounts for 35～80% in the prescription total content; Solubility promoter is made of unary alcohol solvent such as methyl alcohol, ethanol, propyl alcohol, butanols equal solvent, and its content is 5～40%; Thinner is No. 200 industrial napthas and/or dimethylbenzene and/or toluene, and content is 0～70%.

Press the content of organic solvent, each the organic solvent components contents scope that constitutes diluent for polyester paint of the present invention is: N-BUTYL ACETATE is 5～30%; Vinyl acetic monomer is 3～25%; Alkoxy compound is 0～50%; Lactic acid ester compound or diester compounds are 1～8%; Straight chain ketone is 3～10%; Monohydroxy-alcohol is 5～40%; No. 200 industrial napthas of thinner are 0～30%; Dimethylbenzene and/or toluene are 0～70%.

Embodiment one

Take by weighing N-BUTYL ACETATE 18kg respectively, vinyl acetic monomer 10kg, methylene diethyl ether 22kg, ethyl lactate 4kg, butanols 12kg, acetone 4kg and dimethylbenzene 30kg, after filtering, thorough mixing makes solvent or diluent 100kg, this solvent or diluent is in actual applications to the China Resources, three is gloomy, Hua Da, magnificent, admittedly reach the beautiful famous brand name polyester lacquer that waits good solvability and dilution property are arranged all, its solvability and the existing polyester lacquer that contains the pimelinketone composition (include solvent composition: N-BUTYL ACETATE 20% with solvent or diluent, pimelinketone 15%, dimethylbenzene 65%) approaching substantially, spraying application is after on the top-grade furniture surface, this product is at levelling property, the performance index of aspects such as glossiness and existing polyester lacquer solvent or diluent no significant difference, but the composition that meets the environmental protection demand for development in it hardly is less, thereby is subjected to the favorable comment that the user particularly sprays the workman.

Embodiment two

Take by weighing N-BUTYL ACETATE 17kg respectively, vinyl acetic monomer 8kg, methylene diethyl ether 25kg, hexanone 5kg, oxyethyl group methoxy methylmethane 12kg, ethanol 15kg, diisooctyl sebacate 6kg and No. 200 industrial naptha 12kg place in the tempering tank, after filtering, thorough mixing makes the no benzene solvent or diluent 100kg of polyester lacquer, do not contain the composition that does not meet the environmental protection demand for development in this solvent or diluent, so its toxicity is atomic, it is to pyroxylin(e)finish, perchloropolyvinyl paint, oleic series lacquer etc. all has good dilution, spraying application is its levelling property behind top-grade furniture, performance index such as glossiness and existing polyester lacquer are basic identical with solvent or diluent, can satisfy producer and the user spraying demand to all kinds of furniture fully.

Claims (5)

1, a kind of diluent for polyester paint is characterized in that said thinner is a kind of composition that contains main solvent, solubility promoter and thinner, wherein

1.1 main solvent material composition content value accounts for 35～80% of total composition value, is made up of following ingredients:

(a) N-BUTYL ACETATE,

(b) vinyl acetic monomer,

(c) alkoxy compound,

(d) by selecting a kind of organism in the following material

The lactic acid ester compound,

The diester compounds,

(e) straight chain ketone;

1.2 solubility promoter material composition content value accounts for 5～40% of total composition value, is made of the unary alcohol solvent;

1.3 diluent material component concentration value accounts for 0～70% of total composition value, is made of No. 200 industrial napthas and/or dimethylbenzene and/or toluene.

2, diluent for polyester paint as claimed in claim 1, the content range that it is characterized in that constituting each material composition of this thinner is:

N-BUTYL ACETATE 5～30%; Vinyl acetic monomer 3～25%;

Alkoxy compound 0～50%; Lactic acid ester compound 1～8%;

Straight chain ketone 3～10%; Monohydroxy-alcohol 5～40%;

Dimethylbenzene and/or toluene 0～70%.

3, diluent for polyester paint as claimed in claim 1, the content range that it is characterized in that constituting each material composition of this thinner is:

N-BUTYL ACETATE 5～30%; Vinyl acetic monomer 3～25%;

Alkoxy compound 0～50%; Lactic acid ester compound 1～8%;

Straight chain ketone 3～10%; Monohydroxy-alcohol 5～40%;

No. 200 industrial napthas 0～30%.

4, diluent for polyester paint as claimed in claim 1, the content range that it is characterized in that constituting each material composition of this thinner is:

N-BUTYL ACETATE 5～30%; Vinyl acetic monomer 3～25%;

Alkoxy compound 0～50%; Diester compounds 1～8%;

Straight chain ketone 3～10%; Monohydroxy-alcohol 5～40%;

Dimethylbenzene and/or toluene 0～70%.

5, diluent for polyester paint as claimed in claim 1, the content range that it is characterized in that constituting each material composition of this thinner is:

N-BUTYL ACETATE 5～30%; Vinyl acetic monomer 3～25%;

Alkoxy compound 0～50%; Diester compounds 1～8%;

Straight chain ketone 3～10%; Monohydroxy-alcohol 5～40%;

No. 200 industrial napthas 0～30%.