A method for producing powder epoxy composition for matte coating

 

(57) Abstract:

The invention relates to the field of producing powder epoxy compositions for Matt coatings, which are used in electronic, electrical and other industries that require protection products, including heteroclinic materials coatings with good mechanical and decorative properties. The invention consists in mixing the two dry powder compositions containing amine hardeners, and one of the songs pre-incubated at a temperature of 100-110oWith over 6-20 min, crushed to particle size of 30-60 μm, and the thus obtained composition is mixed with the original composition in the ratio of 30-60 wt.% pre-treated powder of the composition and 40-70 wt.% the initial powder composition, which allows to obtain a powder epoxy composition for matte coatings low-temperature formation. table 2.

The invention relates to the field of producing powder epoxy compositions for Matt coatings, which are used in electronic, electrical and other industries, where the necessary protection properties.

For these purposes, the necessary powder compositions, forming a matte coating (values Shine 4-19% GOST 9.032-74) with the specified properties at low curing temperatures of the order of 120-140oC.

Recent increased interest in matte finish due not only to the modern aesthetic requirements, matte finish gives the product a good decorative appearance, makes it less noticeable defects in colouring, does not glare, but also the fact that the reduction of surface gloss has a beneficial effect on humans: reduces distraction and focus.

Modern prior art known methods for producing thermosetting powder compositions for Matt coatings high temperature curing (180-200oWith), but there is no information about the compositions for coatings low-temperature formation (120-140oC).

Known methods for producing epoxy powder compositions for Matt coatings, which require the introduction into the composition of the two hardeners amine and acid types (Application Germany 2324696, 09 D 3/58, 1974; Application Germany 3610757, 09 D 3/58, 09 D 5/03, 1987; Application Germany 4403129 09 D 163/00, 09 D 5/45, 1995). When the high temperature (160-240oC).

Closest to the claimed technical essence is a method for producing powder epoxy composition by mixing two dry powder compositions with different reactivity (Patent UK 1405096, 08 J 3/24, From 09 D 3/58, 1975).

In this way receive epoxy coating with low gloss and good physical and mechanical properties, but the coating formation occurs only at 180oWith 15 minutes However, at temperatures of 120-140oWith using this method, it is impossible to get a matte coating and to achieve good physical and mechanical properties of coatings.

Object of the present invention is to provide a powder epoxy compositions of low-temperature formation of matte coatings and expansion of the range of powder epoxy composites high temperature of formation. This objective is achieved in that in the known method for producing powder epoxy composition for matte coatings by mixing two dry powder compositions containing amine hardeners, one of the songs pre-incubated at a temperature of 100-110oWith over 6-20 min, crushed AI 30-60 wt.% pre-waste composition and 40-70 wt.% the initial powder composition.

Properties of powdered epoxy composition obtained under the influence of temperature during a certain time (6-20 min), significantly changed compared with the original composition of the Century Physico-chemical methods, it was found that in the process of thermal effects in the composition increases the value srednetsenovoj molecular weight of the oligomer decreases epoxy number, however, the formation of spatial-cross-linked polymer does not occur, since the gel fraction after heating at 100-110oWith over 6-20 min is equal to zero. This suggests that thermal effects on the composition in the above temperature-time interval epoxy oligomer reacts only one epoxy group with a molecule of the curing agent, forming a branched structure with a high reactivity, called polymers.

Due to the presence of these branched structures with high reactivity in the powdered epoxy composition this composition melts and spreads much worse compared to the original compositions, forming a coating with a rough (rough) surface, which accordingly speciemen thermal effects: the greater the duration of exposure, the lower values of gloss coatings. The values of the gloss of the coatings formed from the composition, the great value has also the particle size of the powder. At the same time thermal effects than larger particles of the powder composition, the lower values of gloss coatings.

It was found that when the dry mixing the pre-treated powder of the composition with the original powder composition with declared their ratio can generate a high-quality matte coating at low temperatures of 120-140oWith and at high 180-200oC.

Experiments have shown that under certain conditions, thermal effects and the particle size of the powder can be formed matte finish with good physico-mechanical properties and one pre-waste powder compositions, however, the process of formation of the coating is less stable than in the case of using the mixture of the compositions, therefore, the use of mixed powder compositions are preferred.

Used in the claimed method of the initial powder composition is made in the usual method. Ball mill at first mix all the components. The resulting mixture was melted varicella processed powder composition is prepared as follows. The initial powder composition In a thin layer of PTFE film, which is then placed in a thermostat at a temperature of from 100 to 110oC and maintained there for 6-20 minutes and then cooled at room temperature, the melt is pulverized until the particle size of 30-60 microns.

Epoxy powder compositions are prepared by dry mixing in a laboratory ball mill for 1 h

Thus, the proposed technical solution is new, involves an inventive step and is industrially applicable.

Examples of the method

In table. 1 shows the compositions of compositions a and b used to obtain a powdered epoxy composition according to the present method. Physico-mechanical properties of coatings on the basis of the obtained compositions are presented in table. 2.

Example 1.

As the song take part IN1in table. 1. For the manufacture of powder compositions B' part of the song1a thin layer is applied to the PTFE film, which is then placed in a thermostat at a temperature of 110oC and maintained there for 20 minutes the resulting melt is cooled at room temperature, crushed to particle size of 30 μm. Then 60 the mill for 1 hour This mixed composition pneumonectomies way at a voltage of 30 kV is applied to steel plates and utverjdayut at 120oC for 30 minutes While the formed coating has a gloss of 10.5%.

Example 2.

As the composition And take the composition of industrial output of paint of EpiPen 916 (TU 40-2-275-92)1in table. 1, and as the song take part B'1prepared according to example 1. Mix, by weight, 45.h. (45 wt.%) powder compositions IN'1with 55 wt.h. (55 wt.%) compositions AND1in a ball mill for 1 h Formed in the 120oWith over 30 min floor is set to Shine, equal to 19% (table. 2).

Example 3

30 wt. o'clock (30 wt.%) powder compositions IN'1prepared according to example 1 is mixed with 70 wt.h. (70 wt.%) powder composition A. as the composition And use of industrially produced paint PEP-91 (TU 6-10-100-127-83) composition AND3(PL. 1). When the formation temperature 140oWith over 50 min get coverage with glitter 17%, and at 180oWith over 15 min - coated with glitter 9% (table. 2).

Example 4.

As the song take part IN2(PL. 1). For the manufacture of powder compositions IN'1take the song IN22. At a temperature of 120oWith over 30 min obtained coating of white color with the shininess 14% (table. 2).

Example 5.

As the song take part IN3(PL. 1). For the manufacture of powder compositions In' take the song IN3that thin layer is applied to the fluoropolymer film and placed in a thermostat at a temperature of 110oWith 20 minutes Then cooled at room temperature, the melt is pulverized to a particle size of 50 μm. 50 wt.h. (50 wt.%) songs IN'3mixed with 50 wt.h. (50 wt. %) composition3in a laboratory ball mill for 1 h Formed in the 120oWith over 30 min, the coating has a gloss equal to 8% (table. 2).

Example 6.

As songs In the use of IN4(PL. 1). For the manufacture of powder compositions take the song IN4that thin layer is applied to the fluoropolymer film and placed in a thermostat at a temperature of 100oWith 6 minutes Then cooled at room temperature, the melt is pulverized until the particle size of 60 μm. 50 wt.h. (50 wt.%) to the produced dye EpiPen 916 (TU 40-2-275-92) composition AND2(PL. 1). The value of the gloss of the coatings formed at 120oWith over 30 min, 15% (table. 2).

Thus, the proposed method enables to obtain a powdered epoxy composition for matte coatings low-temperature formation with good physical and mechanical properties, with the resulting declared by way of the composition can be used for coating high temperature of formation, and, as can be seen from the table. 2, physico-mechanical properties of these coatings are not inferior properties of matte coatings high-temperature formation on the basis of known epoxy compositions.

A method for producing powder epoxy composition for matte coating, comprising mixing the two original dry powder compositions containing amine hardeners, characterized in that one of the original compositions previously maintained at 100-110oWith over 6-20 min, crushed to particle size of 30-60 μm, and the thus obtained composition is mixed with one of the original compositions in a ratio of 30-60 wt. % pre-treated powder of the composition and 40-70 wt. % of the initial powder composition.

 

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