KR101878068B1 - Inside coating composition for ROPP ED CAP - Google Patents

Abstract

More specifically, the present invention relates to a paint of BPA NI (Non-Intent) type which is superior in ROPP ED CAP inner wicket abrasion, and since the existing VINYL TYPE paint is easy to be hot-rolled by oven heat in drying process after coating, The present invention is not only able to improve the problem but also can be applied to the present invention by applying a polyester type as a countermeasure against the environmental hormone which is currently being discussed in the world. And to a coating composition capable of solving the problems.

Description

Inside coating composition for ROPP ED CAP < RTI ID = 0.0 >

The present invention relates to an ROPP ED CAP inner coating composition.

More specifically, the present invention relates to a paint of BPA NI (Non-Intent) type which is superior in ROPP ED CAP inner wicket abrasion, and since the existing VINYL TYPE paint is easy to be hot-rolled by oven heat in drying process after coating, The present invention is not only able to improve the problem but also can be applied to the present invention by applying a polyester type as a countermeasure against the environmental hormone which is currently being discussed in the world. And to a coating composition capable of solving the problems.

In 1936, the UK metal crawler company developed a ROPP CAP (ROLL-ON Pilfer Proof CAP) made from aluminum plate.

This bottle cap is the most used in the world today because it has the function of preventing the forgery (PP) function and can be used without opener and can make various specifications by taking advantage of the characteristic of aluminum which absorbs the minimum error of bottle entrance and is rich in processability. In addition, ROPP CAP is suitable for soju, liquor, nourishing tonic, sake, soft drink and has high purity aluminum, so there is no risk of rust.

Features and benefits include the ability to form a variety of CAPs from 22mm to 70mm, of which ROPP ED CAP (Extra Deep CAP) is greater than 28mm.

ROPP ED CAP (Extra Deep CAP) is a luxurious bottle cap such as Yangju bottles, and it requires high sophistication. Also, it is difficult to improve the wicket abrasion caused by painting when using vinyl type.

On the other hand, environmental hormones are called endocrine disruptors and they are called environmental hormones because they act as hormones in the body as chemicals that interfere with the normal function of the endocrine system. Inside paints, the inner paint is a basic raw material for epoxy resins used in Bisphenol A (BPA), which is a problem because unreacted materials remain in the resin and are released into the contents and absorbed into the human body. Dioxin is also a substance that occurs when burning vinyl and is an environmental hormone.

The present invention relates to a coating composition which solves these problems by applying Polyester Type as a solution to Wicket Abrasion and environmental hormones.

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above problems, and relates to a paint of BPA NI type excellent in ROPP ED CAP inner wicket abrasion.

Conventional VINYL type paints are likely to be hot-rolled due to oven heat during drying after painting, so that scratched by wicket abrasion has caused a half moon mark in CAP processing.

The present invention aims to solve these problems by applying a polyester type as a countermeasure against environmental hormones that are becoming a global issue in the world.

The ROPP ED CAP inner coating composition having excellent Wicket Abrasion of BPA NI type of the present invention for achieving the above object,

68 to 72% by weight of a polyester resin as a base resin, 23 to 27% by weight of a phenol resin having a formaldehyde content of 1% or less, and 3 to 7% by weight of a melamine resin; And a solvent.

Wherein the ratio of the mixture to the solvent is 2: 4 to 6: 8.

The polyester resin has a molecular weight (MW) of 15,000 to 16,000,

The melamine resin is HMMM (HexaMethoxyMethyMelamine).

The present invention is further characterized in that the mixture further contains 0.4 to 0.6% by weight of wax and 0.04 to 0.06% by weight of an acid catalyst.

Further, the acid catalyst is characterized by an acid value (A.V) of 125 to 135.

The coating composition of Polyester BPA NI type having excellent Wicket Abrasion in the ROPP ED CAP according to the present invention having the above-mentioned structure is problematic in the conventional vinyl type paint, that is, it is likely to be hot-rolled by the oven heat in the drying process after coating, It is possible to solve the problem that a half-moon mark is generated in CAP processing due to the occurrence of scratches.

By applying the polyester type, it is possible to solve the problem of the environmental hormone that is currently being issued worldwide.

Hereinafter, the ROPP ED CAP inner coating composition having excellent processability of BPA NI type according to the present invention will be described in detail.

The ROPP ED CAP inner surface coating material having excellent processability according to the present invention has 68 to 72% by weight of a polyester resin having a molecular weight of 15,000 to 16,000, 23 to 27% by weight of a phenol resin having a formaldehyde content of 1% or less and a melamine resin 3 to 7% by weight.

The ROPP ED CAP inner surface coating material of the present invention has a molecular weight of 15,000 to 16,000 as a base resin and 68 to 72% by weight of a polyester resin. When the molecular weight is less than 15,000 and less than 68% by weight, wicket abrasion is good, . If the molecular weight is more than 16,000, the workability is good, but since the viscosity of the coating is high, it is difficult to increase the amount of the coating in the coating operation. When the content is more than 72% by weight, the curing degree of the coating film is weak and the processing is good but the possibility of Wicket abrasion is increased. Therefore, 68 to 72% by weight of the polyester resin is used.

The phenolic resin is used in 23 to 27 wt% as a curing resin. If the amount is more than 27 wt%, there is a possibility of peeling of the coating film during CAP processing, and less than 23% of the phenol resin may cause a scratch on the coating film due to friction with the wicket.

The melamine resin is used in an amount of 3 to 7% by weight as HMMM. If it is less than 3% by weight, the MEK property deteriorates and the blocking becomes worse after drying. If it is 7% by weight or more, peeling occurs at the end of the CAP. Therefore, 3 to 7% by weight of the melamine resin is suitable.

The acid value of the acid catalyst is preferably 0.04 to 0.06%. If it exceeds 0.06% by weight, the appearance of the coating film becomes poor due to drying in a short period of time after coating. If the amount is less than 0.04% by weight, poor hardness and wicket abrasion and poor workability are shown.

Acid catalysts can use organic acid catalysts and are involved in the reaction with hydroxyl, carboxyl, and amine groups.

The wax may comprise 0.4 to 0.6% by weight. It is preferable that the wax is made of polyethylene having excellent slip and abrasion. If the amount of the wax is less than 0.4% by weight, defective molding occurs in the CAP processing, and if the amount is more than 0.6% by weight, the dried coating film becomes opaque.

The solvent may be a hydrocarbon-based or ketone-based solvent. In the experiment below, hydrocarbon-based and ketone-based solvents were used at 50:50.

The ratio of (1) a mixture of a polyester resin, a phenolic resin, a melamine resin (wax and acid catalyst can be added) and (2) a solvent is set to a weight ratio of 2 to 4: 6 to 8.

Hereinafter, the present invention will be described with examples.

The following Table 1 relates to the raw materials and composition contents used in the experiment.

Comparative Example 1
Comparative Example 2
Comparative Example 3
Comparative Example 4
Example 1
Example 2
Polyester resin
65.0
65.0
75.0
75.0
68.0
72.0
Phenolic resin
20.0
30.0
20.0
30.0
25.0
27.0
Melamine resin
2.0
7.0
2.0
7.0
3.0
7.0
Acid catalyst
0.02
0.03
0.02
0.03
0.04
0.06
Wax
0.4
0.4
0.5
0.5
0.6
0.6
solvent
230.0
230.0
230.0
230.0
230.0
230.0

- Polyester Resin: Polyester Resin (MW: 15,000 ~ 16,000, SK CHEM)

- Phenolic resin: Phenol Resin (less than 1% formaldehyde, ALLNEX)

- Melamine resin: Melamine Resin (HMMM, ALLNEX)

- Acid catalyst: Catalyst (A.V: 125 ~ 135, CYTEC)

- Wax: Polyethylene (BYK)

- Solvent: 50 to 50 solvents such as hydrocarbon (xylene, SK chemical) and ketone (cyclohexanone, GS Caltex)

As shown in Table 1, a mixture of a polyester resin, a phenol resin, a melamine resin, an acid catalyst, and a wax was mixed with a solvent to prepare ED CAP inner surface coating compositions of Comparative Examples 1 to 4 and Examples 1 to 2 .

In order to prepare the paints, the solvent is first added to the mixing container, and the mixture is stirred for 1 hour or more while the polyester resin, the phenol resin, the melamine resin, the acid catalyst and the wax are sequentially added while stirring.

For the physical property test, use a bar coater (# 16) as a coating agent on a 0.18 T aluminum (AL) plate and dry it at 185 ℃ for 10 minutes after drying.

Table 2 below is a comparison table of coating performance of Comparative Examples 1 to 4 and Examples 1 to 2.

Comparative Example 1
Comparative Example 2
Comparative Example 3
Comparative Example 4
Example 1
Example 2
MEK
2
3
2
2
3
3
IMPACT
10/10
10/10
10/10
10/10
10/10
10/10
CROSS-CUT
100/100
100/100
100/100
100/100
100/100
100/100
Pencil hardness
4H
4H-5H
4H
4H-5H
4H
4H-5H
Mobility
0.017
0.018
0.017
0.018
0.018
0.018
P / P CAP
△
Δ-x
△ - ○
△
○
△ - ○
ABRASION
△ - ○
○
△
△ - ○
△ - ○
○

*** ○: Good, △: Normal, ⅹ: Not satisfied

The following is a note on the test method and evaluation in the physical property test of Table 2.

<Resistance to MEK>

It is applied to test MEK (Methyl Ethyl Ketone) resistance of dry paint film. After wrapping it with gauze on the head of hammer (1KG), wet the MEK solvent and rub it on the paint film and reduce the number of times when it is peeled off .

The number of times is one time per round trip and 100 times or more is marked as 100 ↑.

<IMPACT (Du-Pon impact tester)>

The test method is to fix the coating surface to the test equipment and then to drop the weights at a certain weight (1Kg, 0.5Kg, 0.3Kg) and height (30cm, 40cm, 50cm) 10 points of cracks and peeling due to impact on the coated film are visually distinguished by 10 points (10 points free from cracking and peeling).

<CROSS-CUT>

It is applied to evaluate the degree of adhesion of coating film. The test method is as follows. After applying a knife to a total of 100 squares in 1mm lengthwise and widthwise direction, 3M tape is adhered on it and then pulled strongly to show the degree of adhesion of the film. 0/100 "is displayed, and when there is no occurrence of peeling, 100/100 is displayed.

<Pencil hardness>

This test method is a method of measuring the hardness of the dry film using a pencil. The specimen is placed on the test stand, the pencil is held at 45 degrees, the force is applied to the core with a force (1 ± 0.5KG load) 0.5 cm / sec).

Adjust the tip of the core at right angles to the core every 5 times with each pencil of the same hardness. Record the pencil hardness at that time if there is a groove in more than 2 of 5 times.

The order of pencil hardness is from weak (B) to strong (H).

&Lt; ALTEK Mobility (slip resistance test of coating film) >

The test method is to place the specimen on the test stand, fix it with the clamp, put the 2kg weight on the specimen and turn the test switch "ON" to see that the number changes. The resulting coating shows smoothness.

<P / P CAP processing>

Scaffold coatings Screw caps are applied to coatings to evaluate processability and adhesion.

The test method is to process four caps using a CAP machine after lubrication of both sides of the coating surface. Two of them are processed inward and two outward.

Thereafter, the cap is screwed into the four caps, and the CAP state is confirmed after performing the solution of lactic acid solution according to the rapid metal exposing test method.

The judgment is as follows:?: Good,?: Normal, x: Not determined.

<ABRASION TEST>

The test method is to test the SCRATCH property of the coated paint film. The test method is to cut the coated film into 10 x 10 cm size, prepare the specimen, and prepare two specimens so that they come into contact with the coated surface. Apply left, right, and top pressure to prescribed pressure. Also, check the time and speed with the naked eye and check the SCRATCH. Check the SCRATCH state visually after performing the CONTROL (reference) paint two times with the paint to be tested. Record TIME (sec), SPEED (2Hz), and PRESSURE (psi) on the left and right.

The judgment is as follows:?: Good,?: Normal, x: Not determined.

As a result of comparing the performance of the paints of Comparative Examples 1 to 4 and Examples 1 to 2 as shown in Table 2, the acid catalyst used in Comparative Examples 1 to 4 was an organic acid catalyst, which was involved in the reaction with resins (polyester, phenol, melamine) (Lack of hardening) due to the lack of MEK (Poor P) and lack of Abrasion. On the contrary, when the amount of the acid catalyst is increased as in Examples 1 and 2, the MEK property is improved (the degree of curing is increased) and the physical properties are improved. In addition, the synergistic effect is further enhanced by the increase in the amount of wax, .

Claims (5)

delete delete 68 to 72% by weight of a polyester resin as a base resin, 23 to 27% by weight of a phenol resin having a formaldehyde content of 1% or less, and 3 to 7% by weight of a melamine resin; And
And a solvent,
The ratio of the mixture to the solvent is 2: 4 to 6: 8,
The polyester resin has a molecular weight (MW) of 15,000 to 16,000,
Wherein the melamine resin is HMMM (HexaMethoxyMethyMelamine). The ROPP ED CAP inner coating composition is excellent in Wicket Abrasion of BPA NI type. The method of claim 3,
Wherein the mixture further contains 0.4 to 0.6% by weight of wax and 0.04 to 0.06% by weight of an acid catalyst, which is excellent in Wicket Abrasion of BPA NI type. 5. The method of claim 4,
Wherein the acid catalyst has an acid value (AV) of 125 to 135. The ROPP ED CAP inner coating composition having excellent Wicket Abrasion of BPA NI type.