JPS6210170A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain the title compsn. capable of improving pigment dispersion, adhesion, crosslinking properties, water resistance, etc. when it is used as a coating material, by polymerizing an alkyd resin with a particular unsatd. monomer and a polymerizable unsatd. monomer in particular proportions. CONSTITUTION:The title compsn. comprises 5-65wt.% alkyd resin having an oil length of 40-70%, 0.02-8.5wt.% unsatd. monomer of the formula (wherein R<1> is H or a methyl group; R<2>S is an ethyl or propyl group; R<3>-R<4> are each independently H or a methyl or ethyl group) with the balance being a polymerizable unsatd. monomer, Examples of the unsatd. monomer of the above formula include N,N-dimethylaminoethylacrylamide and N,N- dimethylaminopropylacrylamide. Examples of the polymerizable unsatd. monomer constituting the balance include styrene, methyl methacrylate and methyl acrylate. The title compsn. is prepared by solution-polymerizing the above raw materials in an org. solvent using a polymerization initiator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition that forms a strong film with high gloss when heated or dried at room temperature.

To explain in more detail, 1 the present invention has pigment dispersibility, color development,
We provide coating materials that have excellent properties required for paint films, such as drying properties, crosslinking properties, adhesion to substrates, adhesion between substrates, water resistance, alkali resistance, acid resistance, etc. There is one related to resin compositions.

That is, the present invention uses an alkyl oil having an oil length of 40 to 70%.

Rad resin 5-65% by weight, unsaturated monomer having the following general formula (I) 0.02-8.5% by weight (wherein R1 is a hydrogen atom or a methyl group, R2 is an ethyl group or a propyl group, H! and R4 are hydrogen atoms, methyl groups, or ethyl groups) and the remainder is a polymerizable unsaturated monomer.

Commercially available alkyd resins having an oil length of 40 to 70% can be used and no special restrictions are required, but the following are particularly preferably used. That is, oil length 50-65%, number average molecule 11000-200
00. When an alkyd resin containing at least 2% by weight of the acid component is tetrahydrophthalic anhydride,
The composition according to the present invention exhibits excellent performance in terms of drying properties, crosslinking properties, adhesion to substrates, and other properties.

Unsaturated monomers having general formula (I) include N,N-dimethylaminoethyl acrylamide, N,N-dimethylaminepropylacrylamide, N,N-dimethylaminoethylmethacrylamide, N,N-dimethylaminopropyl Examples include methacrylamide.

The monomers may be used alone or as a mixture of two or more. The monomer has a weight f% of 0.02 to 8.5%.

Preferably, it may be used in an amount of 0.2 to 5.0% by weight. This monomer has extremely excellent effects in imparting pigment dispersibility, color development, and adhesion to substrates to the composition.

If it is 0.02% by weight or less, pigment dispersibility 1 color development property,
8. All characteristic properties such as adhesion to the base material are lost.
If the amount exceeds 5% by weight, chemical properties such as water resistance, alkali resistance, acid resistance, oil resistance, etc. will deteriorate significantly.

The remaining polymerizable unsaturated monomers include styrene-methyl methacrylate, ethyl methacrylate, ethyl methacrylate,
Examples include cyclohexyl methacrylate, methyl acrylate, ethyl acrylate, zotyl acrylate, and 2-ethylhexyl acrylate. These monomers may be used alone or in a mixture of two or more.

The resin composition according to the present invention can be prepared by conventional methods without requiring special methods such as preparation.

That is, - using a polymerization initiator such as benzoyl peroxide, azobisisozotyronitrile, for example, in an organic solvent such as toluene, xylene.

A polymerization temperature of 60 to 160° C. can be easily obtained by carrying out solution polymerization.

In the resin composition according to the present invention, if necessary, in addition to the raw materials described above, known fillers and additives such as coupling agents, paint additives, and pigments may be used without any problem.

The present invention will be explained in more detail below using Examples and Comparative Examples.

Examples and Comparative Examples f Preparation of Alkyd Resin to be Used The raw materials shown in Table (I) were charged into a four-bottle flask equipped with a nitrogen inlet tube, a thermometer, a stirrer, and a condenser for water separation.
Raise the temperature to 90°C. After holding at 190°C for 90 minutes, 2
Raise the temperature to 50°C. 250℃ while removing generated water as appropriate.
After continuing the reaction for 7 hours.

Cool to room temperature and use paint thinner A (Atom chemical paint).
(product) was added on August 9, 2020 to prepare alkyd resins used in Examples and Comparative Example f.

Table (I) Raw materials for alkyd resin Ao 1) Product name of Nippon Zeon Corporation Examples and comparative examples
Prepare the ingredients listed in Table 1 (2) in a four-roof flask and heat to 115°C.
The temperature rises to Next, the raw materials shown in Table 11 (3) were added dropwise into the flask over 180 minutes, and the reaction was continued for an additional 60 minutes until '1', where the temperature was maintained at 115°C. Furthermore, Kishin 40f
t-butylperoxybenzony) 0.8. ! The mixture of i' is added six times every 60 minutes, after which the reaction is carried out for 180 minutes. Cool to room temperature to obtain compositions of Examples and Comparative Examples.

In addition, in Table 21, (310 serial numbers represent the compositions of Examples and Comparative Examples.

Table (3) Various tests were conducted using the compositions of the subsurface charging raw materials Examples and Comparative Examples. The test results are shown in Table (4).

The test method and evaluation of test results are as follows.

1. Adhesion: The composition was applied to a glass plate to a film thickness of 30 to 40 μm, dried for a few days at 20° C. and 65% RH, and evaluated by a bipolar eye test. Table (4) Middle 1
The denominator is the number of coated gopans, and the numerator is the number of gopans that remain in the coating when the coating is peeled off after drying.

2. Water resistance: The composition was applied to a degreased iron plate to a film thickness of 30 to 40μ, and was heated at 20°C and 165%RH.
After drying for a day, it was immersed in water for 6 days. After drying this product at room temperature for 2 hours, changes in the film were examined.

26. Titanium white was mixed with the pigment-dispersible acid compound so that the PWC (pigment weight content) was 60%, and kneaded for 60 minutes using a Decilper.

The particle size of this product was measured using a whole crush gauge. In both methods A and B, the smaller the value, the better the pigment dispersibility.

4. Crosslinking property: Composition 100I with Co dryer (Co-containing lid 8%) 0.2. ! After adding i' and stirring and mixing thoroughly, the mixture was coated on a glass plate to a film thickness of 60 to 40 μm. While drying at 20° C. and 65% RH, a rubbing test was performed using xylene every 30 minutes to determine the time until the film stopped dissolving. The shorter this time, the better the crosslinking properties.

5. Adhesion: Apply the composition to a coating thickness of 10 to 20μ.
A degreased aluminum plate was applied and dried for 1 hour. After stacking a similar aluminum plate on top of it and crimping it thoroughly, 1
The mixture was held at 50°C for 160 minutes, and then slowly cooled to room temperature.

Adhesion was evaluated by a peel test according to JIS K6854. The larger the value, the greater the adhesive force.

Table (4) Results of various tests As can be seen from the results of Table (4), the resin composition according to the present invention meets all the desired requirements, namely adhesion, water resistance, pigment dispersibility, crosslinkability, It exhibits excellent adhesion performance.

Claims (1)

[Scope of Claims] 5 to 65% by weight of an alkyd resin having an oil length of 40 to 70%, and 0.02 to 8% of an unsaturated monomer having the following general formula (I).
5% by weight ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, R^1 is a hydrogen atom or methyl group, R^2 is an ethyl group or propyl group, R^3 and R^4 are hydrogen atoms or a methyl group or an ethyl group) and the remainder a polymerizable unsaturated monomer.