WO2023010764A1 - High-flash-point environment-friendly thinner and preparation method therefor and application thereof - Google Patents

Abstract

The present invention relates to the technical field of paint thinners, and provides a high-flash-point environment-friendly thinner and a preparation method therefor and an application thereof. The paint thinner of the present invention is prepared from the following raw materials in parts by mass: 40-65 parts of tripropylene glycol ether, 20-30 parts of cyclohexanediol monomethyl ether, 10-20 parts of tetrabutyl orthosilicate, 5-25 parts of dipropylene glycol monomethyl ether, and 8-15 parts of acetic ester. According to the present invention, a hydrogen bond accepting solvent is used to make it easier for a thinner to form a hydrogen bond with a resin in a paint, such that the formation of a hydrogen bond between a resin and a resin molecule is avoided, the viscosity of a system can be effectively reduced, the efficient thinning effect of the thinner on the paint is realized, the prepared thinner has a high closed-cup flash point which is greater than 68°C, and the thinner belongs to a non-dangerous chemical. The thinner is fresh and non-pungent in smell, healthy, safe, harmless, green, environment-friendly, good in thinning power, wide in a thinning range, capable of thinning a conventional paint in the field, fast in a film forming speed, and compact in a paint film.

Description

A kind of high flash point environment-friendly thinner and its preparation method and application technical field

The invention relates to the technical field of paint thinners, in particular to a high-flash point environment-friendly thinner and its preparation method and application.

Background technique

Paint thinner is a liquid solvent that can be miscible with resin in order to reduce the viscosity of paint and improve the process performance of paint. During the paint coating process, the addition of paint thinner can make the paint suitable for more painting methods. Existing paint thinners are usually based on benzene-containing solvents such as toluene or xylene. Although xylene thinners can improve the volatilization performance of paints and enhance cohesiveness and adhesion, benzene substances will volatilize into the air and affect the environment. and damage to the human body. Therefore, the use of environmentally friendly thinners to replace benzene thinners that are more harmful to human body has far-reaching significance, and it is also an important way to achieve energy saving and emission reduction.

At present, the prior art provides a series of benzene-free environmentally friendly paint thinners. For example, the raw material of the benzene-free thinner provided by the prior art with the patent application number 201310096797.5 consists of dimethyl carbonate, DBE high boiling point solvent, propylene glycol methyl ether acetic acid Ester, butyl acetate, high-boiling point aromatic hydrocarbon S-150 solvent, although it is a new environment-friendly solvent, the flash point of its raw materials used is very low, and there is a safety problem. At the same time, the prior art has solved the problem of benzene-containing diluents, but the non-benzene diluents currently provided all have low flash points.

Studies have shown that when the flash point of the diluent is generally lower than 60°C, according to the national standard GB/T13690-92 "Classification and Labeling of Commonly Used Hazardous Chemicals", liquids with a flash point lower than 60°C are dangerous goods. There are potential safety hazards in the transportation and storage process, which limits the application of paint thinner as a commercial commodity.

In addition, the paint thinner not only dilutes the paint and reduces the viscosity of the system, but also further affects the bonding strength between the paint film and the substrate, the leveling of the paint film, and the drying time. At the same time, improper selection of diluent will reduce the compatibility between the solvent and the resin, and the active components in the coating cannot be uniformly dispersed, resulting in poor coating performance.

Therefore, it is of great significance to develop a kind of environmental protection paint thinner with high flash point and good thinning effect for the wide application of paint.

Contents of the invention

The object of the present invention is to provide a high-flash point environment-friendly diluent and its preparation method and application, so as to solve the problems of low flash point, poor paint dilution effect and poor compatibility with resins in the environment-friendly paint diluent provided by the prior art. The environment-friendly diluent provided by the invention not only meets the requirements of environmental protection and low VOC emission, but also achieves the effect of high flash point, and has higher safety when the paint thinner is stored and transported as a separate commodity.

In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

The invention provides a high-flash point environmentally friendly diluent, which is prepared from raw materials containing the following parts by mass:

40-65 parts of tripropylene glycol ether, 20-30 parts of cyclohexanediol monomethyl ether, 10-20 parts of orthobutyl silicate, 5-25 parts of dipropylene glycol methyl ether, and 8-15 parts of acetate.

Preferably, in the above-mentioned high-flash point environment-friendly diluent, it is prepared from raw materials comprising the following parts by mass:

55-60 parts of tripropylene glycol ether, 20-25 parts of cyclohexanediol monomethyl ether, 12-15 parts of orthobutyl silicate, 15-20 parts of dipropylene glycol methyl ether, and 11-15 parts of acetate.

Preferably, in the above-mentioned high-flash point environment-friendly diluent, the acetate is dipropylene glycol methyl ether acetate.

Preferably, in the aforementioned high-flash point environment-friendly diluent, the tripropylene glycol ether is one or both of tripropylene glycol methyl ether and tripropylene glycol butyl ether.

The present invention also provides a kind of preparation method of high-flash point environment-friendly diluent, comprising the following steps:

Mix tripropylene glycol ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, and acetate evenly, stir, and stand still to obtain a high-flash point environmentally friendly diluent.

Preferably, in the above method for preparing a high-flash point environment-friendly diluent, the stirring rate is 200-500 r/min, and the stirring time is 30-80 min.

The invention also provides the application of a high-flash point environment-friendly diluent in diluted paint.

Preferably, in the application of the above-mentioned high flash point environment-friendly diluent, the coating includes alkyd coating, polyurethane coating, acrylic coating, epoxy coating, epoxy ester coating, fluorocarbon coating, steel structure fireproof coating, general Floor paint, road marking paint or reflective paint.

Compared with the glycol ether diluents provided by the prior art, the diluent composition of the present invention uses propylene glycol ether solvents as the main component, which can replace glycol ether solvents, and has the same performance as the solvent. It can solve the problem of the toxicity of glycol ether solvents. Moreover, propylene glycol ether contains hydroxyl groups, alkyl groups and ether bonds, which can dissolve both hydrophobic compounds and water-soluble compounds. wider.

Tripropylene glycol ether used in the present invention, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, dipropylene glycol methyl ether acetate are all hydrogen bond accepting solvents, and the number of hydrogen bond acceptors is more than that of alcohols , Ketone compounds, among them, tripropylene glycol butyl ether and tripropylene glycol methyl ether have more hydrogen bond acceptors than ethylene glycol ether solvents, and are more likely to form hydrogen bonds with the resin in the coating, avoiding the resin and Hydrogen bonds are formed between resin molecules, which can effectively reduce the viscosity of the system. At the same time, because propylene glycol ether has strong hydrogen bonds, hydrogen bonds will also be formed between its molecules, which increases the boiling point of the diluent, and the flash point also increases.

The boiling point of tripropylene glycol ether and butyl orthosilicate of the present invention is about 270°C, the boiling point of dipropylene glycol methyl ether and cyclohexanediol monomethyl ether is about 190°C, and the high boiling point and low boiling point solvents are used in combination. On the basis of improving the sag resistance of the coating film, the high boiling point solvent can increase the flash point, and at the same time control the evaporation rate of the coating film, so that the coating film has a better surface effect and high gloss, and avoid the low boiling point components in the thinner The problem of uncontrollable curing rate of coating caused by excessive volatilization. Moreover, cyclohexanediol monomethyl ether can replace glycol ether solvents such as ethylene glycol butyl ether and diethylene glycol methyl ether, as a high boiling point solvent, low toxicity and environmental protection.

It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following beneficial effects:

(1) The diluent of the present invention has the characteristics of fresh and non-pungent smell, no harm to health and safety, and environmental protection.

(2) In the present invention, high and low boiling point solvents are compounded and used, and the prepared diluent has a high flash point, and the closed flash point is greater than 68 ° C, which meets the requirements for the identification of non-hazardous chemicals in the "Regulations on the Safety Management of Hazardous Chemicals", and belongs to non-hazardous chemicals. Hazardous Chemicals.

(3) The present invention uses a hydrogen bond-accepting solvent to make it easier for the diluent to form a hydrogen bond with the resin in the coating, avoiding the formation of a hydrogen bond between the resin and the resin molecule, effectively reducing the viscosity of the system, and realizing the effect of the diluent on the coating. efficient dilution.

(4) The diluent of the present invention has good diluting power and wide diluting range, can dilute conventional paints in this field, and has a fast film-forming speed, and the formed paint film is compact and has high gloss.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The invention provides a high-flash point environmental protection diluent, which is prepared from the following raw materials in parts by mass:

40-65 parts of tripropylene glycol ether, 20-30 parts of cyclohexanediol monomethyl ether, 10-20 parts of orthobutyl silicate, 5-25 parts of dipropylene glycol methyl ether, and 8-15 parts of acetate.

Preferably, in the above-mentioned high-flash point environment-friendly diluent, it is prepared from raw materials comprising the following parts by mass:

55-60 parts of tripropylene glycol ether, 20-25 parts of cyclohexanediol monomethyl ether, 12-15 parts of orthobutyl silicate, 15-20 parts of dipropylene glycol methyl ether, and 11-15 parts of acetate.

Further preferably, in the above-mentioned high-flash point environmentally friendly diluent, it is prepared from raw materials comprising the following parts by mass:

23 parts of tripropylene glycol butyl ether, 35 parts of tripropylene glycol methyl ether, 25 parts of cyclohexanediol monomethyl ether, 12 parts of butyl orthosilicate, 15 parts of dipropylene glycol methyl ether, and 15 parts of acetate.

Preferably, in the above-mentioned high-flash point environment-friendly diluent, the acetate is dipropylene glycol methyl ether acetate.

Preferably, in the above-mentioned high-flash point environment-friendly diluent, the tripropylene glycol ether is one or both of tripropylene glycol methyl ether and tripropylene glycol butyl ether.

The present invention also provides a kind of preparation method of high-flash point environment-friendly diluent, comprising the following steps:

Mix tripropylene glycol ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether and acetate, stir at a stirring rate of 200-500r/min for 30-80min, and let stand for 10-50min to obtain high Flash point environmentally friendly thinner.

The invention also provides the application of a high-flash point environment-friendly diluent in thinning paint.

Preferably, in the application of the above-mentioned high-flash point environmentally friendly diluent, the coating includes alkyd coating, polyurethane coating, acrylic coating, epoxy coating, epoxy ester coating, fluorocarbon coating, steel structure fireproof coating, general floor paint, road marking paint or reflective paint.

Example 1

The present invention provides a high-flash point environment-friendly diluent, which is prepared from the following raw materials in parts by mass: 23 parts of tripropylene glycol butyl ether, 35 parts of tripropylene glycol methyl ether, 25 parts of cyclohexanediol monomethyl ether, orthosilicon 12 parts of butyl ester, 15 parts of dipropylene glycol methyl ether, and 15 parts of dipropylene glycol methyl ether acetate.

The preparation method is: mix tripropylene glycol butyl ether, tripropylene glycol methyl ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, dipropylene glycol methyl ether acetate, and stir at a stirring rate of 200r/min for 80min , standing for 10 minutes, that is, a high-flash point environmentally friendly diluent.

Example 2

The present invention provides a high-flash point environment-friendly diluent, which is prepared from the following raw materials in parts by mass: 40 parts of tripropylene glycol butyl ether, 20 parts of cyclohexanediol monomethyl ether, 10 parts of orthobutyl silicate, 10 parts of propylene glycol methyl ether, 8 parts of dipropylene glycol methyl ether acetate.

The preparation method is: mix tripropylene glycol butyl ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, and dipropylene glycol methyl ether acetate, stir at a stirring rate of 300r/min for 60min, and let stand for 20min. That is, a high-flash point environmentally friendly diluent.

Example 3

The present invention provides a high-flash point environment-friendly diluent, which is prepared from the following raw materials in parts by mass: 65 parts of tripropylene glycol methyl ether, 30 parts of cyclohexanediol monomethyl ether, 10 parts of orthobutyl silicate, 20 parts of propylene glycol methyl ether, 10 parts of dipropylene glycol methyl ether acetate.

The preparation method is: mix tripropylene glycol methyl ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, and dipropylene glycol methyl ether acetate, stir at a stirring rate of 500r/min for 30min, and let stand for 40min. That is, a high-flash point environmentally friendly diluent.

Example 4

The present invention provides a high-flash point environment-friendly diluent, which is prepared from the following raw materials in parts by mass: 55 parts of tripropylene glycol monomethyl ether, 28 parts of cyclohexanediol monomethyl ether, 15 parts of orthobutyl silicate, 12 parts of propylene glycol methyl ether, 8 parts of dipropylene glycol methyl ether acetate.

The preparation method is: mix tripropylene glycol methyl ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, and dipropylene glycol methyl ether acetate, stir at a stirring rate of 500r/min for 30min, and let stand for 20min. That is, a high-flash point environmentally friendly diluent.

Example 5

The present invention provides a high-flash point environment-friendly diluent, which is prepared from the following raw materials in parts by mass: 40 parts of tripropylene glycol butyl ether, 10 parts of tripropylene glycol methyl ether, 30 parts of cyclohexanediol monomethyl ether, orthosilicon 15 parts of butyl ester, 20 parts of dipropylene glycol methyl ether, and 15 parts of dipropylene glycol methyl ether acetate.

The preparation method is: mix tripropylene glycol butyl ether, tripropylene glycol methyl ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, and dipropylene glycol methyl ether acetate, and stir at a stirring rate of 300r/min for 70min , standing for 50 minutes, that is, a high-flash point environmentally friendly diluent.

Comparative example 1

This comparative example provides an environmentally friendly diluent, which is prepared from the following raw materials in parts by mass: 23 parts of tripropylene glycol butyl ether, 35 parts of tripropylene glycol methyl ether, and 15 parts of dipropylene glycol methyl ether.

Comparative example 2

This comparative example provides an environmentally friendly diluent prepared from the following raw materials in parts by mass: 15 parts of dipropylene glycol methyl ether acetate.

Comparative example 3

This comparative example provides an environmentally friendly diluent prepared from the following raw materials in parts by mass: 15 parts of ethyl acetate and 15 parts of butyl acetate.

Comparative example 4

This comparative example provides an environmentally friendly diluent prepared from the following raw materials in parts by mass: 23 parts of tripropylene glycol butyl ether, 35 parts of tripropylene glycol methyl ether, and 25 parts of cyclohexanediol monomethyl ether.

Comparative example 5

This comparative example provides an environmentally friendly diluent prepared from the following raw materials in parts by mass: 12 parts of butyl orthosilicate.

The high-flash point environment-friendly diluent made by the embodiments of the present invention 1～5 measures flash point (closed) according to GB/T 261-2008 standard, measures the content of benzene compounds according to GB/T23990-2009 standard, and the results are shown in Table 1 shown.

The flash point (closed mouth) of table 1 environmental protection diluent and the measurement result of benzene compound

It can be seen from Table 1 that the closed flash point of the environmentally friendly diluent prepared by the present invention is greater than 68°C, which meets the requirements for the identification of non-hazardous chemicals in the "Regulations on the Safety Management of Hazardous Chemicals". Benzene compounds are produced, which are environmentally friendly and benzene-free diluents.

Use the high-flash-point environment-friendly diluent prepared in Example 1 of the present invention to dilute alkyd coatings, polyurethane coatings, acrylic coatings, epoxy coatings, and fluorocarbon coatings respectively, and use the diluents of Comparative Examples 1 to 5 and the special coatings for the above coatings. The diluent is used as a comparison. In terms of mass percentage, the amount of the above diluent is 20% of the paint. According to GB/T1723-93, the viscosity of the diluted paint is measured (paint-4 cups/s), and the paint film is obtained after brushing Table 2-5 shows the drying time (h), gloss (°) and appearance results after standing at room temperature for 24 hours.

Table 2 Paint Viscosity (Paint-4 Cup/s) Test Results

It can be seen from Table 2 that the diluent of the present invention has a lower viscosity after diluting the paint than the diluent of the comparative example, and at the same time has a better dilution effect than the special diluent for paint. It shows that the dilution effect of the composite component of the present invention is better than the dilution performance of individual components or some components.

Table 3 paint film drying time (h) results

It can be seen from Table 3 that the surface-drying time of the paint diluted in Example 1 of the present invention is about 3 hours, and the hard drying can be achieved in 20-22 hours. Thinner, indicating that the multi-component compounding of the present invention can accelerate the drying of the paint film.

Table 4 coating gloss (°) test result

As can be seen from Table 4, the paint film gloss obtained by the coating using the diluent of Example 1 is higher, and the gloss of the paint film formed with respect to the special thinner for paint has increased by about 10°, and a certain component in Example 1 is used alone Or when certain components are used as diluents (Comparative Examples 1-5), the gloss of the paint film is relatively poor, which shows that the compound diluent of multiple components of the present invention can significantly improve the gloss of the paint film.

Table 5 coating appearance test results

As can be seen from Table 5, cracks or protrusions may appear on the surface of the paint film formed in Comparative Examples 1-5, while the surface of the paint film formed in Example 1 is smooth and smooth without cracking, and conventional paints in this field can be diluted.

In summary, as can be seen from the above Tables 2 to 5, the multi-component compounded diluent of the present invention reduces the viscosity of the paint, shortens the drying time, and the formed paint film has good gloss, smooth surface, and no cracking, and is applicable to Conventional coatings in this field.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (8)

A high-flash point environment-friendly diluent is characterized in that it is prepared from raw materials comprising the following parts by mass: 40-65 parts of tripropylene glycol ether, 20-30 parts of cyclohexanediol monomethyl ether, 10-20 parts of orthobutyl silicate, 5-25 parts of dipropylene glycol methyl ether, and 8-15 parts of acetate. A kind of high-flash point environment-friendly diluent according to claim 1, is characterized in that, is prepared from by the raw material that comprises following mass parts: 55-60 parts of tripropylene glycol ether, 20-25 parts of cyclohexanediol monomethyl ether, 12-15 parts of orthobutyl silicate, 15-20 parts of dipropylene glycol methyl ether, and 11-15 parts of acetate. A kind of high flash point environment-friendly thinner according to claim 1 or 2, is characterized in that, described acetate is dipropylene glycol methyl ether acetate. A kind of high flash point environment-friendly diluent according to claim 2, is characterized in that, described tripropylene glycol ether is one or both in tripropylene glycol methyl ether and tripropylene glycol butyl ether. The preparation method of a kind of high-flash point environment-friendly thinner as claimed in any one of claims 1 to 4, characterized in that it comprises the following steps: Mix tripropylene glycol ether, cyclohexanediol monomethyl ether, butyl orthosilicate, dipropylene glycol methyl ether, and acetate evenly, stir, and stand still to obtain a high-flash point environmentally friendly diluent. The preparation method of a high-flash point environment-friendly diluent according to claim 5, characterized in that, the stirring rate is 200-500r/min, and the stirring time is 30-80min. The application of a kind of high-flash point environment-friendly diluent as described in any one of claims 1 to 4 in diluted paint. The application of a kind of high-flash point environment-friendly diluent according to claim 7, wherein the coating includes alkyd coating, polyurethane coating, acrylic coating, epoxy coating, epoxy ester coating, fluorocarbon coating, steel Structural fire protection coatings, general purpose floor coatings, road marking coatings or reflective coatings.