KR20170030821A

KR20170030821A - Sealer composition for body

Info

Publication number: KR20170030821A
Application number: KR1020150128226A
Authority: KR
Inventors: 주가현
Original assignee: 현대자동차주식회사
Priority date: 2015-09-10
Filing date: 2015-09-10
Publication date: 2017-03-20
Also published as: KR101755840B1

Abstract

The present invention relates to a body sealer composition and, more specifically, to a body sealer composition which can greatly reduce specific gravity to 0.9 or less by using a filler obtained by mixing calcium carbonate coated with fatty acid, a glass bubble, and an acrylic polymer bubble in a conventional body sealer, thereby being able to implement weight reduction of a vehicle.

Description

[0001] SEALER COMPOSITION FOR BODY [0002]

The present invention relates to a body sealer composition, and more particularly, it is possible to greatly reduce the specific gravity to 0.9 or less by using a filler in which potassium carbonate coated with a fatty acid and a glass bubble and an acrylic polymer bubble are mixed in a conventional body sealer, To a body sealer composition capable of realizing a vehicle weight reduction.

In general, a body sealer is applied to prevent leakage of water, soundproofing and anti-rusting functions of iron plate and iron plate joint parts such as body panel overlap part of a vehicle body, float, wheel house, engine room and trunk. The body sealer can be produced by using a polyvinyl chloride (PVC) resin as a main component and blending a filler, a plasticizer and various additives.

However, recent fuel economy and various regulations have been strengthened, and vehicle weight has been greatly demanded. In order to improve the watertightness and rust prevention performance of the panel laminating part of the car body after the electrodeposition hardening, a body sealer having a specific gravity of about 1.60 on a paste (PASTE) composed of main component polyvinyl chloride (PVC) is applied . The body sealer is coated with about 4.8 kg per minute based on a medium-sized car such as LF. In particular, 35 to 55% of a calcium carbonate filler having a specific gravity of about 2.8 is used for charging and workability. The weight of the body sealer is high due to the use of the calcium carbonate filler having a high weight, which hinders the weight reduction of the vehicle.

Korean Patent No. 0236475 discloses a PVC body sealer composition comprising a PVC paste, a phthalate ester compound as a plasticizer, a bicarbonate as a filler, and an alkaline earth metal oxide as an additive and a modified epoxy resin as a modifier, It is not recognized at all.

Korean Patent Publication No. 1999-0043784 discloses a PVC body sealer composition containing a plasticizer, a filler, an additive, a modifier, etc. in a polyvinyl chloride (PVC) paste. However, I do not know.

Therefore, in order to reduce the specific gravity of the body sealer, it is required to develop a material which can be replaced with a new low specific gravity filler instead of minimizing the existing filler.

Korean Patent No. 0236475 Korean Patent Publication No. 1999-0043784

In order to solve the above problems, the present invention can significantly reduce the specific gravity to 0.9 or less by using a filler obtained by mixing potassium carbonate, glass bubbles and acrylic polymer bubbles coated on a conventional body sealer with fatty acid, And the inventors have completed the invention.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a body sealer composition capable of realizing weight reduction by significantly reducing specific gravity.

The present invention relates to a composition comprising 10 to 40% by weight of a polyvinyl chloride (PVC) resin; 20 to 50% by weight of a filler comprising a mixture of calcium carbonate particles coated with fatty acid, glass bubbles and acrylic polymer bubbles; 23 to 35% by weight of a plasticizer; And 5 to 10% by weight of an adhesive agent.

The siller composition according to the present invention can significantly reduce the specific gravity to 0.9 or less by using a filler obtained by mixing potassium carbonate coated with fatty acid and glass bubble and acrylic polymer bubble in a conventional body sealer.

In addition, due to the reduced weight, the vehicle weight can be reduced by about 44% (body sealer usage: 2.1 kg / unit) based on the medium-sized car such as LF.

In addition, since they have the same viscosity and workability as the existing ones, they can be applied without additional coating equipment and processes.

Hereinafter, the present invention will be described in more detail with reference to one embodiment.

Each component constituting the siller composition according to the present invention will be described in more detail as follows.

According to a preferred embodiment of the present invention, the polyvinyl chloride (PVC) resin may be a homopolymer having a weight average molecular weight of 1,700 to 1,800, a copolymer having a weight average molecular weight of 1,300 to 1,500, or a mixture thereof. Specifically, the polyvinyl chloride (PVC) resin may be used in an amount of 10 to 40% by weight. When the content is less than 10% by weight, the adhesive strength and abrasion resistance are deteriorated. When the content is more than 40% by weight, .

According to a preferred embodiment of the present invention, the filler may be a mixture comprising 14 to 32% by weight of calcium carbonate particles, 5 to 15% by weight of glass bubbles and 1 to 3% by weight of acrylic polymer bubbles relative to the siller composition . Specifically, the calcium carbonate particles can impart chargeability, dischargeability, and flowability, and the glass bubble and the acrylic polymer bubble can be used for reducing specific gravity.

According to a preferred embodiment of the present invention, the calcium carbonate particles having a particle size of 10 to 20 탆 and coated with stearic acid can be used. Specifically, the calcium carbonate particles can be used in an amount of 14 to 32% by weight. If the content is less than 14% by weight, dischargeability and workability are deteriorated. If the content is more than 32% by weight, .

According to a preferred embodiment of the present invention, the glass bubble is used for weight reduction of the body sealer, and is applied to various industrial fields such as plastic, sealant and the like as a typical means of weight reduction. The glass bubble may be at least one selected from the group consisting of soda lime borosilicate, silica, zirconia, titania, alumina and alumino-silicate. Specifically, the glass bubble may be used in an amount of 5 to 15% by weight. If the content of the glass bubble is less than 5% by weight, the effect of reducing the specific gravity is deteriorated, and if it is more than 15% by weight, the hardness of the sealer may increase and the elongation may be decreased. In order to prevent the glass bubble from being broken by the pressure applied to the sealer upon application of the sealer composition and to prevent the effect of reducing the specific gravity, it is preferable to use one having a high pressure resistance.

According to a preferred embodiment of the present invention, the glass bubble has a specific gravity of 0.1 to 2.0, and the acrylic polymer bubble has a specific gravity of 0.1 to 2.0.

According to a preferred embodiment of the present invention, the acrylic polymer bubble may be acrylic, polymethylmethacrylate or a mixture thereof, and is applied for the purpose of weight reduction in other industrial fields such as rubber. Specifically, the acrylic polymer bubbles may be used in an amount of 1 to 3% by weight. When the content of the acrylic polymer bubbles is less than 1% by weight, the pressure resistance and solvent resistance are poor and the specific gravity reduction effect is deteriorated. Can be degraded.

According to a preferred embodiment of the present invention, the plasticizer may be a phthalate-based, paraffin-based or a mixture thereof. Specifically, the plasticizer may be used in an amount of 23 to 35% by weight. If the content of the plasticizer is less than 23% by weight, the viscosity of the composition may deteriorate the dischargeability. If the content is more than 35% by weight, the viscosity may decrease.

According to a preferred embodiment of the present invention, the adhesion-imparting agent may be at least one selected from the group consisting of isocyanate-based, silane-based, dicyandiamide-based, polyamine-based and epoxy resin-based ones. Specifically, the adhesive agent may be used in an amount of 5 to 10% by weight. If the content of the adhesive agent is less than 5% by weight, the adhesive strength is deteriorated. If the content is more than 10% by weight, the adhesive strength may be deteriorated excessively.

According to a preferred embodiment of the present invention, the sealer composition may further comprise at least one additive selected from the group consisting of a moisture absorbent, an aggregation enhancer and a stabilizer. Specifically, calcium oxide (CaO) may be used as the moisture absorber. The moisture absorber may be used in an amount of 1 to 5% by weight, preferably 1 to 3% by weight, based on the siller composition. If the content of the moisture absorber is less than 1% by weight, swelling may occur due to internal moisture. There may be a problem that the surface is cracked or the adhesive force is lowered.

An epoxy resin is used as the flocculation improving agent, and specifically, epichlorohydrin bisphenol A resin can be used. The coagulation enhancer may be used in an amount of 1 to 5% by weight, preferably 1 to 3% by weight, based on the total weight of the sealer composition. If the content is less than 1% by weight, the cohesive force of the sealer may deteriorate. The workability may be lowered due to an increase in viscosity.

The stabilizer is used for improving storage stability and heat resistance, and may include at least one selected from barium (Ba), zinc (Zn), and tin (Sn). The stabilizer may be used in an amount of 1 to 5% by weight, preferably 1 to 3% by weight based on the silane composition. If the content of the stabilizer is less than 1% by weight, the heat resistance may be deteriorated. .

According to a preferred embodiment of the present invention, the siller composition may have a specific gravity of 0.9 or less. Specifically, the siller composition is reduced to an ultra-low specific gravity of 0.9 or less relative to the specific gravity of the composition (about 1.60 specific gravity), thereby reducing the amount of the siller composition used to lighten the vehicle.

Accordingly, the siller composition according to the present invention can significantly reduce the specific gravity to 0.9 or less by using a filler obtained by mixing potassium carbonate, which is coated with a fatty acid, and glass bubble and acrylic polymer bubble, in a conventional body sealer. In addition, due to the reduction in specific gravity, it is possible to realize a lighter vehicle by reducing 44% (body sealer usage: 2.1 kg / unit) compared to existing models based on medium-sized vehicles such as LF. There is an advantage that it can be applied without process.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Examples 1 to 6 and Comparative Examples 1 to 13

Siller compositions were prepared by mixing the components as shown in Tables 1, 2, and 3 at a ratio by weight. However, Table 1, 2, and 3 show the results of comparing the physical properties of the silyl compositions prepared by varying the contents of calcium carbonate, glass bubble, and acrylic polymer bubbles coated with the fatty acid used as the filler.

Specifically, the thermal stability of the material properties was determined by naked eye after confirming the occurrence of bubbles inside and outside the sealer after the heat aging, and was expressed as good (no surface bubbles) and unsatisfactory (surface bubbles).

[Components]

(1) Polyvinyl chloride (PVC) resin

PVC-1: a homopolymer having a weight average molecular weight of 1,700 to 1,800

PVC-2: Copolymer having a weight average molecular weight of 1,300 to 1,500

(2) Fillers

Calcium carbonate: Calcium carbonate particles having an average particle size of 10 to 20 占 퐉 as limestone ores

Calcium carbonate coated with fatty acid: calcium carbonate particles having an average particle size of 10 to 20 μm coated with fatty acid (stearic acid)

Glass bubble: VS5500, 3M company

Acrylic polymer bubbles: 461 DE 20 d70, Azonobel

(3) Plasticizer

DINP: diisononyl phthalate

Paraffin system: mixture of normal paraffin, isoparaffin and naphthalene

(4) Adhesive agent

Blocked Isocyanate < RTI ID = 0.0 >

division Example One 2 3 4 5 6 Furtherance PVC resin PVC-1 10 10 6 10 10 10 PVC-2 20 20 12 20 20 20 Filler Calcium carbonate - - - - - - Calcium carbonate coated with fatty acid 23 14 32 19 17 14 Glass bubble 5 15 10 10 10 13 Acrylic polymer bubble 2 One 2 One 3 3 Plasticizer DINP 25 25 23 25 25 25 Paraffin system 5 5 5 5 5 5 Adhesive (urethane) 5 5 5 5 5 5 Moisture absorbent (calcium oxide) 2 2 2 2 2 2 Coagulation enhancer (epichlorohydrin bisphenol A) 2 2 2 2 2 2 Stabilizer (tin oxide) One One One One One One Properties importance 0.81 0.80 0.88 0.81 0.90 0.85 Specific gravity reduction 0.72 0.78 0.70 0.77 0.68 0.73 Elongation (%) 100 80 80 85 90 85 Heat stability Good Good Good Good Good Good

division Comparative Example One 2 3 4 5 6 7 Furtherance PVC resin PVC-1 10 10 10 10 10 10 10 PVC-2 20 20 20 20 20 20 20 Filler Calcium carbonate (Non coating) 20 - - - - - - Calcium carbonate coated with fatty acid 15 25 20 15 29 28 27 Glass bubble (soda lime borosilicate) - 5 10 15 - - - Acrylic polymer bubble (acrylic) - - - - One 2 3 Plasticizer DINP 20 25 25 25 25 25 25 Paraffin system 5 5 5 5 5 5 5 Adhesive (urethane) 5 5 5 5 5 5 5 Moisture absorbent (calcium oxide) 2 2 2 2 2 2 2 Coagulation enhancer (epichlorohydrin bisphenol A) 2 2 2 2 2 2 2 Stabilizer (tin oxide) One One One One One One One Properties importance 1.58 1.34 1.17 1.03 1.30 1.10 0.95 Specific gravity reduction - 0.26 0.43 0.57 0.28 0.48 0.63 Elongation (%) 110 95 75 45 110 115 115 Heat stability Good Good Good Good Good Good Good

division Comparative Example 8 9 10 11 12 13 Furtherance PVC resin PVC-1 10 10 10 10 10 5 PVC-2 20 15 15 15 20 5 Filler Calcium carbonate (Non coating) - - - - - - Calcium carbonate coated with fatty acid 24 15 23 21 10 35 Glass bubble (soda lime borosilicate) 3 18 11.5 10 15 15 Acrylic polymer bubble (acrylic) 3 2 0.5 4 3 2 Plasticizer DINP 25 25 25 25 27 23 Paraffin system 5 5 5 5 5 5 Adhesive (urethane) 5 5 5 5 5 5 Moisture absorbent (calcium oxide) 2 2 2 2 2 2 Coagulation enhancer (epichlorohydrin bisphenol A) 2 2 2 2 2 2 Stabilizer (tin oxide) One One One One One One Properties importance 1.53 0.96 1.03 0.85 0.92 1.43 Specific gravity reduction 0.15 0.64 0.50 0.73 0.61 0.10 Elongation (%) 100 dissatisfaction
(Less than 40) 60 70 dissatisfaction
(Less than 40) dissatisfaction
(Less than 40) Heat stability Good Good Good dissatisfaction dissatisfaction Good

According to the results of Tables 1, 2, and 3, the specific gravity of Comparative Example 1 including calcium carbonate and calcium carbonate coated with fatty acid was 1.53, which is the highest in the grains of Examples 1 to 6.

On the other hand, in Comparative Examples 2 to 7 in which only calcium carbonate coated with fatty acid and glass bubble or acrylic type polymer bubbles were mixed, the specific gravity was reduced as compared with Comparative Example 1, but it was confirmed that the specific gravity reduction was not large.

In Comparative Example 8 in which the content of the glass bubbles was less than 5% by weight, the specific gravity was slightly reduced but the specific gravity reduction was insignificant. In Comparative Example 9 in which the glass bubble content was excessively over 15% by weight, It is confirmed that there is a problem of rising.

In Comparative Example 10 in which the content of the acrylic polymer bubbles was less than 1% by weight, the specific gravity was slightly reduced as in the case of the glass bubble, but the specific gravity reduction was insignificant. In Comparative Example 11, It is confirmed that there is a problem that air bubbles are generated inside the sealer upon curing. In addition, in the case of Comparative Examples 12 and 13 in which the content of calcium carbonate or glass bubble coated with fatty acid was high or low, the specific gravity did not reach 0.9 or lower, and the elongation and heat stability were deteriorated.

In contrast, in Examples 1 to 6 in which 14 to 32% by weight of calcium carbonate coated with fatty acid was mixed with 5 to 15% by weight of glass bubbles and 1 to 3% by weight of acrylic polymer bubbles, the conventional calcium carbonate (specific gravity: about 2.8 g / ㎤) than that of the filler, it can be reduced to 0.9 g / ㎤ or less. Also, it was confirmed that the physical properties required for the evaluation of physical properties of elongation and heat stability are satisfied.

[Experimental Example]

Table 4 shows the physical properties of the conventional sealer composition (commercially available as Integrated Sealer, Bokwang) and the sealer composition of the present invention (Examples 1 to 6).

Test Items Requirements Comparative Example Examples 1 to 6 Viscosity (cPS) 5.0-13 million, subject to agreement between the parties under environmental conditions. 112,000 123,000 importance 0.90 or less 1.58 0.9 or less Volume change rate Volume change before shrinkage shrinkage: Within 3%, swelling: No. Good Good Solid content (%) 97 or higher 98.4 97.0 Flowability (mm) below 10 0 3 Paintbrush There should be no continuous flow Good Good Extensibility (mm) 50100 79 70 Exterior After heat-resistant CYCLE: no discoloration, crack, pinhole, etc. Good Good Hardness (Hs) 5680 70 79 Adhesiveness After heat-resistant CYCLE: No peeling of adhesive layer Good Good Adhesive strength (kg / cm2) 7 or more 11.3 11.6 Tensile strength (kg / cm2) 8 or more 9.7 8.7 Elongation (%) 40 or more 150 75 Storage stability (%) Viscosity change rate should be less than 50% 16.1 48 Weatherability No swelling or cracks Good Good Pressure resistance 375bar After leaving under pressure, the specific gravity change rate should be 5% or less. Good Good

According to the results of Table 4, the specific gravity of the comparative example, which is conventionally available on the market, is higher than that of the specific gravity (0.9 or less), which is much higher than that of the comparative example And it was found that all of the other required physical properties were satisfied.

Therefore, the siller compositions prepared in Examples 1 to 6 can significantly reduce the specific gravity to 0.9 or less by using a filler obtained by mixing potassium carbonate, which is coated with fatty acid, and glass bubble and acrylic polymer bubble, in a conventional body sealer. In addition, it was confirmed that the vehicle weight reduction can be achieved by reducing the specific gravity by 44% (body sealer usage: 2.1 kg / unit) based on the medium-sized vehicle such as LF.

Claims

10 to 40% by weight of a polyvinyl chloride (PVC) resin;
20 to 50% by weight of a filler comprising a mixture of calcium carbonate particles coated with fatty acid, glass bubbles and acrylic polymer bubbles;
23 to 35% by weight of a plasticizer; And
5 to 10% by weight of an adhesive agent;
&Lt; / RTI >

The method according to claim 1,
Wherein the polyvinyl chloride (PVC) resin is a homopolymer having a weight average molecular weight of 1,700 to 1,800, a copolymer having a weight average molecular weight of 1,300 to 1,500, or a mixture thereof.

The method according to claim 1,
Wherein the filler is a mixture comprising from 14 to 32% by weight of calcium carbonate particles, from 5 to 15% by weight of glass bubbles and from 1 to 3% by weight of acrylic polymer bubbles, based on the siller composition.

The method according to claim 1,
Wherein the calcium carbonate particles have a particle size of 10 to 20 占 퐉 and are coated with stearic acid.

The method according to claim 1,
Wherein the glass bubble is at least one selected from the group consisting of soda lime borosilicate, silica, zirconia, titania, alumina and alumino-silicate.

The method according to claim 1,
Wherein the glass bubble has a specific gravity of 0.1 to 2.0 and the acrylic polymer bubble has a specific gravity of 0.1 to 2.0.

The method according to claim 1,
Wherein the acrylic polymer bubble is acrylic, polymethyl methacrylate or a mixture thereof.

The method according to claim 1,
Wherein the plasticizer is a phthalate-based, paraffin-based or a mixture thereof.

The method according to claim 1,
Wherein the adhesion-imparting agent is at least one member selected from the group consisting of isocyanate-based, silane-based, dicyandiamide-based, polyamine-based and epoxy resin-based ones.

The method according to claim 1,
Wherein the sealer composition further comprises at least one additive selected from the group consisting of a moisture absorbent, an aggregation enhancer, and a stabilizer.

The method according to claim 1,
Wherein the siller composition has a specific gravity of 0.9 or less.