JPS63175098A - Rust preventive wax - Google Patents

Abstract

PURPOSE:To obtain a rust preventive wax, having excellent rust preventive, permeability, drying and film removing properties as well as heat and water resistance and useful for automobiles, by blending a wax oxidation product with microcrystalline wax, organic amine, water-soluble resin and water, etc. CONSTITUTION:An emulsion type rust preventive wax, consisting of (A) 10-40wt.% wax oxidation product, prepared by oxidizing petroleum wax with a blend gas of air with oxygen gas at 1:0.0005-0.1 volume ratio of the oxygen gas to the air at 100-200 deg.C temperature and having 10-60mgKOH/g acid value with (B) 5-20wt.% microcrystalline wax, (C) 1-5wt.% organic amine, e.g. hexylamine, etc., (D) 5-15wt.% water-soluble resin, e.g. acrylic resin emulsion, etc., (E) 0.1-10wt.% polymer, e.g. PE, PP, etc., (F) 0.1-5wt.% nonferrous metal rust preventive agent, e.g. colloidal silica, etc., and (G) the remainder of water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rust-preventing wax used for rust-preventing automobile bodies and the like.

(Prior Art) Regarding this type of anti-rust wax, the present applicant previously proposed using organic solvents such as mineral spirits as part of anti-rust measures based on the demand for improving the quality of automobiles, in accordance with Japanese Patent Application Laid-Open No. 60-35063. Compared to rust preventive agents that use organic solvents, emulsion-type anti-rust wax that uses water as a solvent maintains its anti-rust performance for a long period of time without causing coating defects after film formation. disclosed that he would do so. Examples of such antirust waxes are as follows.

(Problem to be Solved by the Invention) However, with such conventional anti-corrosion waxes, the wax color is brown and opaque, so when applied to, for example, an automobile engine room or an exterior panel, the product quality may be affected. Also, when applied to non-ferrous metals, especially aluminum parts and zinc parts, the coating film adhesion is inferior compared to steel plate parts, so corrosion resistance equivalent to that of steel plate parts cannot be maintained and is inferior. there were.

(Problems to be Solved by the Invention) In order to solve the above-mentioned problems, the inventor conducted intensive research and found that petroleum wax was mixed with 0.0005 to 0.1 of oxygen gas per 1 part of air at a temperature of 100 to 200°C. Wax oxidation product with acid value 10 to 60 mg KOH/g, microcrystalline wax, organic amine, water-soluble resin, polymer, and non-ferrous metal rust inhibitor as main components, oxidized with a mixed gas of (volume ratio) in a specific ratio It has been found that the above problems can be solved by an emulsion-type rust-preventing wax containing 10% of the total amount of water and the remainder of the wax being water.

The antirust wax of this invention is based on the above knowledge,
Wax oxidation product 10-40 with an acid value of 10-60 mgKOH/g obtained by oxidizing petroleum wax at a temperature of 100-200°C with a mixed gas of 1 part air to 0.0005-0.1 oxygen gas (volume ratio) % by weight, microcrystalline wax 5-20% by weight, organic amine 1-5% by weight,
Water-soluble resin 5-15% by weight, polymer 0.1-5% by weight
, the non-ferrous metal rust preventive agent is produced in an amount of 0.1 to 5% by weight, and the remainder is water.

(Function) In the antirust wax of this invention, petroleum wax is
At a temperature of 0 to 200°C, 0.00 part oxygen gas per 1 part air.
Acid value 1 oxidized with a mixed gas of 0.05 to 0.1 (volume ratio)
For wax oxidation products of 0 to 60 mg KOfl/g, if the acid value is less than 10 mg KOH/g, the emulsion will become unstable, and if the acid value is greater than 60 mg KOfl/g, its rust-preventing power will decrease. If the oxygen gas volume ratio is less than 0.05, the hue becomes brown and opaque, impairing the product's marketability. On the other hand, if the value is greater than 0.4, the hue is transparent, but adding more will not change the hue and will increase the cost.

If the amount of wax oxidation product added is less than 10% by weight,
Rust-preventing power is insufficient, and if it exceeds 40% by weight, it will gel, which is undesirable.

If the amount of microcrystalline wax added is less than 5% by weight, the antirust ability will be insufficient, and if it exceeds 20% by weight, it will gel.

As organic amines, alkylamines having 3 to 18 carbon atoms, alkanolamines, morpholines, etc. can be used, and specific examples include hexylamine, trimethylamine, laurylamine, stearylamine, monoethanolamine, jetanolamine, triethanolamine, N, N-dimethylethanolamine, N,N-diethylethanolamine, N
, N-diisopropylethanolamine, N,N-dibutylethanolamine, N-(β-aminoethyl)ethanolamine, N-methylethanolamine, N-methyljetanolamine, and morpholine. If the amount added is less than 1% by weight, there will be no effect, and if it exceeds 5% by weight, the water resistance will be poor.

As the water-soluble resin, for example, acrylic resin emulsion, vinyl acetate, etc. can be used, and the amount added is 5 to 15% by weight to increase the viscosity of the emulsion and improve the sagging property during coating.

As the polymer, for example, polyethylene, polypropylene, maleated polyethylene can be used, and the amount added is 0.
If it is less than 1% by weight, there is no effect (and if it exceeds 10% by weight, cracks will appear in the formed coating film.

Colloidal silica, alumina sol or lithium silicate is used as the non-ferrous metal rust preventive agent to improve the adhesion of coatings on non-ferrous metals, especially aluminum parts and zinc parts, and to improve the rust preventive power. If the amount added is less than 0.1% by weight, there will be no improvement in adhesion or rust prevention, and if it exceeds 5% by weight, water resistance and permeability will be poor.

(Example) This invention will be explained by the following example and comparative example.

10kg of microcrystalline wax with low melting point of 82℃
10-2 mol/kg of cobalt phosphate/kg wax was added to the mixture, and the mixture was heated at 170°C under normal pressure for 7 hours at a temperature of air:oxygen gas = 1 F.
A reaction gas of 0.003 (volume ratio) is blown into the reactor, and then low-boiling oxides are removed and filtered to obtain an acid value (
AV) Microcrystalline oxide of 38 KOR/g was obtained. Using this oxide, the antirust wax of Example 1 was obtained according to a conventional method using the formulation shown in Table 1.

1 New 1 ± 1 Processing 10 kg of α-olefin wax with carbon number of 30 or more to 10-2 mol/kg of cobalt phosphate, 1
7 hours at 60°C under normal pressure, air:oxygen gas = 170.
A reaction gas of 0.002 (volume ratio) was blown into the reactor, and then low-boiling oxides were removed and filtered to give an acid value (AV) of 4.
An α-olefin wax oxide having a concentration of 1 KOH/g was obtained. Using this oxide, the antirust wax of Example 2 was obtained in the same manner as shown in Table 1.

10kg of paraffin wax with Fst point of 155℃,
Add cobal phosphate l-10-2 mol/kg wax and keep at 150℃ under normal pressure for 5 hours Air:Oxygen gas=1:0.1
(volume ratio) of reaction gas is blown into the reactor, and after removing low-boiling point oxides, the acid value (AV) is 50 KOH/g.
of paraffin wax oxide was obtained. Using this oxide, the antirust wax of Example 3 was obtained in the same manner as shown in Table 1.

Comparison ■ Add 10-2 mol/kg of cobalt phosphate to 10 kg of microwax and adjust the acid value (
AV) 28 ■KOH/g of microwax oxide was obtained. Using this oxide, a rust preventive wax of a comparative example was obtained in the same manner as shown in Table 1.

The performance of the rust preventive waxes of Examples 1 to 3 and Comparative Examples above was evaluated using the test method shown below, and the results are shown in Table 2.
Shown below.

Test method (a) Rust prevention test salt spray: According to JIS K2246. However, film thickness 1
A thickness of 50±20 μm was applied, and the degree of rust occurrence was shown after 500 hours. The film thickness when measured was 50 μm.

Rust occurrence 0.1-10% A 11-25 B 26-50 C 51-100D Material: Steel plate: 5 pcc Aluminum parts: ADC12 Zinc parts, ZDC2 (B) Dissolve 20% of hue wax in spindle oil and keep at constant temperature at 50℃ Measured with a Union measuring device. The smaller the measured value, the higher the transparency.

(c) - Lower part 20 of sagging test piece (SPCC type 210x300 n+)
0 Mask the seal and spray anti-rust wax at a pressure of 5
The coating was applied to a film thickness of 150 μm under the condition of kg/cm 2 , and then the masking was removed and left standing vertically in a thermostatic chamber at 50° C. for 30 minutes, after which the length of the dripping was measured.

(d) Two permeability test pieces (SPCC type 70 x 150 Tsuru) with a gap of 1
00μm laminated plate, bend the middle part (75mm position) of one of them outward by about 60'', drop 1ml of each anti-corrosion wax into the gap, leave it standing vertically for 24 hours, remove the bent plate, and let it penetrate. The length was measured.

(E) Spray anti-corrosion wax on a drying test plate (5PCC type 210 x 300 Dragon) at a pressure of 5 kg/cm2 and a film thickness of 150 ± 20 μm.
After applying the coating and leaving it at room temperature for 30 minutes, the time until the stickiness disappeared was measured by touching it with a finger.

(c) Spray each anti-rust wax on a water resistance test plate (5PCC type 210 x 300-kura) at a pressure of 5 kg/cm" and a film thickness of 150 ± 2.
The film was applied to a thickness of 0 μm, left for 24 hours after application, and then immersed in tap water at 20° C. for 72 hours, and changes in the state of the film were visually observed.

(g) Paint film removability Examine the ease of removing oversprayed paint.

(H) Secondary sagging property A film thickness of 150±20 μm was applied to a horizontal test plate, and after drying for 24 hours, it was turned vertically and heated to 130° C. for 1 hour, and its vertical length was measured.

(W) Thermochromic property Each anti-corrosion wax is applied to a test plate coated with white enamel at a spray pressure of 5 kg/cm" and a film thickness of 150±20 μm, dried for 24 hours after application, and yellow when heated at 130°C for 1 hour. Degeneration was investigated.

Table 1 Table 2 (Effects of the invention) As explained above, the antirust wax of this invention has
The main components are wax oxidation products oxidized under specific conditions, microcrystalline wax, organic amines, water-soluble resins, polymers, and nonferrous metal rust inhibitors, with the remainder being water, resulting in rust prevention, permeability, and dryness. It has excellent properties such as durability, water resistance, film removability, and high-temperature film stability, and its color is desirable as a rust-preventing wax. It exhibits the same corrosion resistance as steel sheet parts for aluminum and zinc parts without reducing the value of the product, and has the effect of maintaining rust prevention performance for a long period of time.

Claims (1)

[Claims] 1. Petroleum wax at a temperature of 100-200℃, air 1
10 to 40% by weight of wax oxidation product with an acid value of 10 to 60 mgKOH/g, 5 to 20% by weight of microcrystalline wax, organic Amine 1-5% by weight, water-soluble resin 5-15% by weight, polymer 0.1-10%
An emulsion-type rust-preventing wax whose main component is 0.1 to 5% by weight of a non-ferrous metal rust preventive agent, and the remainder is water.