JPS6166770A - Rust-proofing hot-melt wax - Google Patents

Abstract

PURPOSE:To produce the titled wax resistant to the flexural cracking in cold place, by mixing a petroleum wax or synthetic wax, an oxidized wax, a metal sulfonate, a grease and a film-modifier at specific ratios. CONSTITUTION:The objective wax composition can be prepared by mixing (A) 30-70pts.(wt.) of one or more petroleum wax or synthetic wax with (B) 0.5-10pts. of oxidized wax (e.g. oxidized paraffin), (C) 5-20pts. of a metal sulfonate (e.g. calcium alkylbenzene-sulfonate), (D) 5-20pts. of grease and (E) 5-45pts. of a film-modifying agent (e.g. polyacrylic acid ester).

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a hot-melt rust-preventing wax composition, more specifically, a hot-melt rust-preventing wax composition applied to members, sills, etc. of automobile body structures, or bag parts such as doors. This invention relates to a melt-based antirust wax composition.

(Conventional technology) In recent years, there has been a strong demand for improved quality of automobiles, and the conditions and environments in which automobiles are used have become extremely wide-ranging.In particular, vehicles exported to cold regions such as Canada and North America are subject to freezing roads in winter. The environment for vehicle corrosion caused by snow melting agents such as rock salt that is sprayed to prevent corrosion is becoming more severe.

For the above reasons, conventionally, bag-like parts such as members, sills, doors, etc. of car body structures are coated with electrodeposition, and then a hot-melt rust-preventing wax containing petroleum wax as a main component is used. The properties required of these waxes are: h) No dripping during application (hereinafter referred to as secondary dripping); (B) No dripping during use, especially in high temperature environments during the summer period (hereinafter referred to as secondary dripping). (c) It is permeable because the application area is bag-shaped, (c) It has excellent rust prevention ability, (e) It does not cause paint film defects due to heat cycles, etc. .

The compositions of conventionally used rust-preventing waxes are as follows: Conventional Example 1 Conventional Example 2 Petroleum wax: 70 parts by weight Petroleum wax: 56 parts by weight.

(Problems to be Solved by the Invention) However, the conventional hot-melt anti-rust waxes described above have poor performance in terms of adhesion to iron plates or electrodeposited plates, anti-corrosion ability, dripping after application, etc. Although it is improving,
There was a problem in that cracks could occur when bending in cold weather.

(Means for Solving the Problems) The present invention has been made by focusing on the above-mentioned conventional problems. Wax 0.5~
The above problem is attempted to be solved by using 10 parts by weight of the metal sulfonate, 6 to 20 parts by weight of the metal sulfonate, 5 to 20 parts by weight of the grease, and 5 to 45 parts by weight of the film modifier.

Petroleum waxes and synthetic waxes that can be used in this invention include paraffin waxes, microcrystalline waxes, slack waxes, polyethylene waxes, etc. with melting points of 50 to 100°C, and if the content of these waxes is less than 30 parts by weight, rust prevention is not possible. The film thickness that contributes to the force cannot be obtained,
Moreover, if it exceeds 70 parts by weight, cracks or the like tend to occur in the coating, which is not preferable.

Examples of oxidized waxes include paraffin oxide, polyethylene oxide, oxide of Fischert's wax, ethylene/monoethylenically unsaturated acid co-compound, ethylene-α
- Examples include olefin monoethylenically unsaturated acid copolymers and montan wax conductors. The amount of oxidized wax added is 0.5 to 10 parts by weight, and if it is less than 0.5 parts by weight, the required rust prevention ability cannot be obtained, and if it exceeds 10 parts by weight, the melting point of the wax composition will be excessively lowered. This is not desirable because it causes

As the metal sulfonate, magnesium, calcium, and barium salts of alkylbenzenesulfonic acid and magnesium, calcium, and barium salts of dinonylnaphthalenesulfonic acid can be suitably used, and the amount added is 5 to 20 parts by weight, and 5 parts by weight. If it is less than 20 parts by weight, the rust preventive power is insufficient, and if it exceeds 20 parts by weight, the melting point of the composition will be too low, which is not preferable.

One of the features of the rust-preventing wax of the present invention is that it contains grease in its composition, and the grease is made of calcium, lithium, magnesium, sodium, etc., and has excellent adhesion to iron plates or electrodeposited plates. It increases the rust prevention ability of the edge part, and also reduces the sag (
- Indicates the effect of preventing dripping. The amount of such grease added is 6 to 20 parts by weight; if it is less than 5 parts by weight, the desired effect cannot be obtained, and if it is added more than 20 parts by weight, no significant effect on performance can be obtained, and it is considered undesirable. It's the economy.

Another feature is the addition of a film modifier. As the film modifier, polyacrylic esters, mineral oils such as Pufitstock, polybutene succinic anhydride adducts, etc. can be used.

These film modifiers impart flexibility to the formed film and prevent the formation of cracks or cracks during bending in cold regions. The amount added is 6 to 45 parts by weight, and if it is less than 5 parts by weight, the required performance cannot be obtained, and if it is added more than 45 parts by weight, the melting point of the composition will be lowered, which is not preferable.

(Function) The rust-preventing wax of the present invention has the above composition, and in particular contains grease and a film modifier, so that it can protect the car body by 60%.
°C, and the rust prevention wax temperature when applied to the car body is 1
When the temperature is between 20 and 130'C, it fully penetrates into every corner of the car body, enhances the rust prevention ability of the edges, and can adhere to an average thickness of 15,071 m (minimum 50 μm) even on vertical surfaces. This imparts flexibility to the formed film and prevents cracks from forming when bent, even in cold regions.

,(Example) Next, the present invention will be explained with reference to Examples and Test Examples.

Example 1 A wax was made based on the composition shown below.

Paraffin wax 85 parts by weight Paraffin oxide 51 Calcium alkylbenzenesulfonate 18 l.

Lithium grease 161 Plystock 10 l Polybutene succinic anhydride adduct 17 l Example 2 A wax was prepared based on the composition shown below.

Slack wax 40 parts by weight Polyethylene wax 1 oxidized ethylene wax 8 Barium dinonylnaphthalene sulfonate 15 l Calcium grease 1
0 l Polyacrylic Acid Ester 51 Black Stock 151, Example 3 A wax was prepared based on the composition shown below.

My Reflectance Wax 50 parts by weight Polyethylene wax 51 ethylene, monoethylene,
Unsaturated acid copolymer 21 Magnesium dialkyl sulfosuccinate 10 Barium grease
5 #Polyacrylic acid ester a
l Pritestock 20 l Polybutene succinic anhydride adduct 51 Test Examples The waxes of Examples 1 to 8 and the following composition for comparison: Microcrystalline wax 95% by weight natural wax oxide 8 #Metal soap
AK made by West German Telloson with ~2#
Regarding R-3135, the corrosion resistance, cold flexibility, secondary sag resistance, and thermal cycling properties were measured according to the evaluation methods shown below, and the obtained results are shown in Table 1.

, Evaluation method: Corrosion resistance 5PCD (JIS G3141) - Width: 0 stitches x Length: 150 meters x Thickness: o, stm degreased test plates were used as test plates, and Examples 1 to 8 and commercially available products (AKR −
835) was applied to a dry film thickness of 50±10 μm and 150±20 pm, respectively.1. Tl5Z2371
After being left in a room at a temperature of 6 to 5° C. and a relative humidity of 45 to 85% for 500 hours using a salt spray tester similar to the above, the test pieces were subjected to a salt spray test to determine the degree of rust.

Cold resistance flexibility 5POD (JIS G3141) Width 0 x Length 1
Examples 1 to 8 and commercially available wax (AKR-135) were applied to a wet film thickness of 1 on a test plate of 50 dragons x 0.8 fl thick.
It was coated to a thickness of 50±20 μm, placed in a low temperature constant temperature bath adjusted to -20±2° C., and cooled for 8 hours. Outside diameter 2 in the tank after cooling
Place a QIII mandrel at the longitudinal center of the test piece, bend the test piece to 130 degrees in 1 second, and check for peeling of the coating film.

, secondary sagging 5POD (JXS G3141) width 70mm x length 1
Half of the surface of a test plate of 50 conditions x 0.8 thickness (70 x 7
5-> Masking, wet film thickness 150±20μm
The sample wax was applied to. The masking tape was removed and the sample was left horizontally in standard conditions for 24 hours. After standing, the test piece was placed vertically in a constant temperature bath adjusted to a temperature of 30±2°C with the masking part facing down, and after being held for 30 minutes, the presence or absence of dripping on the masking part was examined.

A sample wax was applied to a wet film of 150±20 μm on a degreased test piece of 3POD (JIS G3141) width 70 mm x length 150 nm x thickness 0.81 m and left for 72 hours. After standing, the test piece was heated to 50±1°C.
195%RH or higher, 16 hours → room temperature 0.5 hours → -30
±2°C, 3 hours → Room temperature 0.5 hours → 60±2°C, 8 hours → Room temperature, 1 hour is one cycle After completing the 8-cycle test, take out the test piece and check whether there are any abnormalities in the appearance. investigate.

Crane 1 Table Middle 1, Melting point - According to JIS K2521 (Solid paraffin melting point test method).

2. Flash point - According to JIS K22 s 5 (crude oil and petroleum products flash point testing method).

& Specific gravity...Depends on the specific gravity cup (J Engineering 5K5400
(Specified in 4 f9.2 (2) of General Test Methods for Paints).

, (Effects of the Invention) As explained above, the antirust wax of this invention has the following effects:
As is clear from the results shown in Table 1, the composition of 1 m or more of petroleum wax, synthetic wax, oxidized wax, metal sulfonate, grease, and film modifier improves adhesion and edge area compared to conventional wax. It is possible to obtain the effect that it fully exhibits the performance of corrosion resistance and sagging resistance after painting, and is also excellent in cold resistance and flexibility.

Claims (1)

[Claims] 1. The following composition: 30-70% of one or more petroleum waxes and synthetic waxes.
A hot-melt anticorrosion wax composition comprising: 0.5 to 10 parts by weight of oxidized wax, 5 to 20 parts by weight of metal sulfonate, 5 to 20 parts by weight of grease, and 5 to 45 parts by weight of film modifier.