KR101623967B1

KR101623967B1 - Silicone sealant comprising pearl and the manufacturing method thereof

Info

Publication number: KR101623967B1
Application number: KR1020140154461A
Authority: KR
Inventors: 최성훈
Original assignee: 최성훈; 다우실란트산업 주식회사
Priority date: 2014-11-07
Filing date: 2014-11-07
Publication date: 2016-05-24
Also published as: KR20160054884A

Abstract

The present invention relates to a silicone sealant containing pearl used in high-grade interior decorations and a method of manufacturing the same. More particularly, the present invention relates to a silicone sealant comprising pearl silicate and a vinyl siloxane. The silicone sealant is preferably selected from the group consisting of polydimethylsiloxane, silicone oil, Methyl Oximino Silane Silicone sealant comprising pearlite constituted by a mixture of Vinyl Oximino Silane (VOSO), Fumed Silica, Amino Silane, Pearl Pigments, Catalyst and the manufacture thereof &Lt; / RTI >

Description

TECHNICAL FIELD [0001] The present invention relates to a silicone sealant containing perl and a method for producing the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a polydimethylsiloxane, a polydimethylsiloxane, a polydimethylsiloxane, a polydimethylsiloxane, a polydimethylsiloxane, a polydimethylsiloxane, a polydimethylsiloxane, a polydimethylsiloxane, Silicone oil, Methyl Oximino Silane (MOS), Vinyl Oximino Silane (VOS), Fumed Silica, Amino Silane, Pearl Pigments ), A catalyst (Catalyst), and a process for producing the same.

The materials that are filled to maintain water tightness and airtightness for various joints and seams are generally called sealing materials. These materials are used for the purpose of enhancing the durability of buildings by fixing the members with some strength and elasticity. Is used.

Especially, the elastic sealing material among the sealing materials is called a sealant. Depending on the type of filling, it is divided into amorphous materials such as amorphous materials and gaskets. Narrow sealing materials refer to amorphous materials. Amorphous materials are used as sealants (Silicone , Modified Silicone, Polysulfide, Polyurethane) and Caulking (Products used in Joints with allowable stretch ± 10% or less).

In the present invention, it is intended to provide a technology including a pearl in order to apply such a sealant to a high-quality interior, and in the related art, a double coated layer (hereinafter referred to as " double coated layer ") of Korean Patent Publication No. 10-2010-0038656 Discloses a tire side wall rubber composition comprising pearl which contains pearl having a pearl containing pearl. However, in the case of the patent, the pearl-containing composition is not cured (rubberized) There is a problem in that it is not suitable for solving the technical problem of the present invention in which pearl is formed by coating so that the pearl itself is sprayed in the sealant to give various interior effects.

Korean Patent Publication No. 10-2010-0038656 (published date: Apr. 15, 2010)

The present invention provides a pearl breaker, a pearl that brilliantly shines colorful colors without cracking of the pearl, by providing the components and their compounding sequence in order to prevent the pearl itself or the silicone sealant containing pearl from breaking during the rubberizing process The present invention provides a silicone sealant comprising the silicone sealant.

In order to achieve the above object,

According to the present invention,

45 to 65 wt% of polydimethylsiloxane,

8 to 20 wt% of silicone oil (Silicone oil)

1.5 to 8 wt% of methyl oximino silane (MOS)

0.2 to 3 wt% of vinyloximino silane (VOS)

2 to 15 wt% of fumed silica

Amino Silane 0.2 to 3 wt%

10 to 30 wt% of Pearl Pigments,

And a pearl which is constituted by a mixture of 0.01 to 0.3 wt% of a catalyst,

As a method for producing the same,

A step of sequentially adding polydimethylsiloxane, silicone oil and Methyl Oximino Silane (MOS) to a reactor equipped with a stirrer, followed by primary dispersion by stirring at 400 to 500 rpm,

After completion of the primary dispersion process, fumed silica is further added to the reactor, followed by secondary dispersion by stirring at 800 to 900 rpm,

After completion of the secondary dispersion process, pearl pigments are further added to the reactor and the mixture is stirred at 400 to 500 rpm for tertiary dispersion,

Adding a catalyst to the reactor after the third dispersion process, and stirring the mixture at 400 to 500 rpm for 4 times to disperse the silicone sealant.

The silicone sealant comprising the pearl according to the present invention has the advantage that even if the pearl is contained in the silicon, it is possible to provide silicon containing high-quality pearles without causing breakage of pearls or breakage of the product.

And it contains pearl, it is luxurious, it can produce different shapes according to the viewing direction, and it has a characteristic of brilliantly shining because of its excellent gloss.

Hereinafter, the above-described technical configuration will be specifically described together with examples.

The silicone sealant comprising the pearl according to the present invention

45 to 65 wt% of polydimethylsiloxane of a polymer,

Silicone Fluid Silicone oil 8 to 20 wt%

1.5 to 8 wt% of methyl oximino silane (MOS)

0.2 to 3 wt% of vinyloximino silane (VOS)

2 to 15 wt% of fumed silica

Amino Silane 0.2 to 3 wt%

10 to 30 wt% of at least one selected from white pearl, silver pearl and hologram pearl,

And a mixture of 0.01 to 0.3 wt% of a catalyst.

The polydimethylsiloxane has a unique property, is excellent in structural flexibility, has good resistance to heat, climate, moisture, oxidation, shear deformation, low surface tension and low surface free energy, It is nonpolar and incompatible with organic polymers. Also, it has low glass transition temperature (Tg <-120 ℃) and maintains this property even in a wide temperature range.

When the amount of the polydimethylsiloxane used is less than 45 wt%, the amount of the resin constituting the polymer is small and the functional problem of the sealant is caused. When the amount of the polydimethylsiloxane is more than 65 wt%, the reactor is excessively present, And an excessive amount of a crosslinking agent is required, the polydimethylsiloxane is preferably limited to a range of 45 to 65 wt% of the total sealant.

The silicone oil generally has a chain-like structure as shown in the following molecular structural formula. The skeleton of this molecule is formed by a siloxane bond. When molecules having this structure are aggregated to form a substance, since the individual molecules are independent, the molecular chains can freely move each other, In other words, it is a property of liquid. As a result, the viscosity is high. However, when R in the molecular structure is methyl, that is, the methylsilicone oil polymerization degree (number of Si) is 2 is 0.65 cSt at room temperature, and about 50 CSt.

The silicone oil used in the present invention is a dimethylsiloxane polymer fluid having a viscosity of 100 cs to 1,000 cs.

If the viscosity is less than 100 cs, the effect on the flowability is increased. If the viscosity exceeds 1,000 cs, the chain of the polymer used as the oil becomes longer and the workability is lowered. Therefore, It is preferable to use it within the range of.

If the amount of the silicone oil used is less than 8 wt%, the worker may have difficulty in working the extrusion rate of the sealant before curing. When the amount exceeds 20 wt%, sagging may occur during the vertical coking before curing, The use of the silicone oil is preferably limited to a range of 8 to 20 wt% with respect to the total weight of the silicone sealant.

Methyl Oximino Silane (MOS) and Vinyl Oximino Silane (VOS) have a function as a cross-linking agent. When the amount is less than the above-mentioned range, the equivalent ratio of the siloxane polymer having a hydroxyl function is There is a problem that the unreacted residual amount exists and the soft structure due to the crosslinking is formed and is weaker than the required strength (Shore A) as the sealant, and when it is used in excess of the indicated range, There is a problem that the storage stability becomes weak due to the existence of the reactor and active reaction with the moisture in the atmosphere. Therefore, the use of the methyl oximino silane (MOS) and the vinyl oximino silane (VOS) The amount used is 1.5 to 8 wt% based on the total weight of the silicone sealant composition; But is preferably limited to a range of 0.2 to 3 wt%.

The above-mentioned fumed silica is an amorphous silicon dioxide as a very light white powder. The average diameter of the spherical base particles is 7 to 40 nm and the space between the particles is large, minimizing heat transfer by the gas. It has a wide surface area (50 ~ 380m2 / g), unique surface characteristics, and high purity silicon compound. It has low impurity content and low moisture content. In many industrial fields, various additives such as reinforcing agents, adhesives, thermal insulation materials, finishing materials, block inhibitors, polishing and dispersing aids are used.

When the amount of the above-mentioned aerosol silica is less than 2 wt%, there is a problem that the hardness becomes weak. When the amount of the aerosol silica is more than 15 wt%, there is a problem that the flowability as a function of the sealant becomes weak. Is preferably limited to a range of 2 to 15% by weight based on the total weight of the composition.

The aminosilane is used as an adhesion promoter, a coupling agent, and a resin additive, and has a function of improving the chemical bonding of the resin to the inorganic filler and the reinforcing material. When the amount of the aminosilane used is less than 0.2 wt%, adhesion is poor and adhesiveness failure (AF) occurs. When the amount of the aminosilane is more than 3 wt%, the storage stability of the sealant becomes poor, The amount of the aminosilane to be used is preferably limited to a range of 0.2 to 3 wt% based on the total weight of the silicone sealant composition.

The pearl pigment is a kind of pigment used to give an effect to the surface of a plastic. Since the brightness and the color change depending on the viewing angle, a variety of atmosphere can be produced. The pearl pigment is basically coated with titanium dioxide in mica (mica), which reflects light and transmits subtle color light such as pearl luster or iridescent color depending on viewing angle. Types include white mica, interference mica, colored mica, and silver mica.

When the amount of the pearl pigment is less than 10 wt%, the transparency of the sealant increases, and the appearance of the pearl effect is difficult to obtain. On the other hand, when the amount exceeds 30 wt%, the problem that the basic tolerance, Therefore, the use amount of the pearl pigment is preferably limited to a range of 10 to 30 wt% of the total sealant.

The pearl pigment is prepared by mixing dimethyl siloxane fluid and pearl in a weight ratio of 1: 1 to 1.2: 1 and firing to increase the degree of dispersion. The pearl pigment has a particle size of 1.5 x 1.5 mm do.

In this case, when the mixing ratio is out of the range, there is a problem that the pilling of the pearls is strong in the tertiary dispersion process and the mixing is not uniformly performed. Particularly, desirable.

A specific formulation for the composition of the silicone sealant containing pearl having the above-described technical composition is as follows.

58% by weight of polydimethylsiloxane,

13 wt% of silicone oil (Silicone oil)

4.3 wt% of methyl oximino silane (MOS)

1 wt% of vinyl oximino silane (VOS)

7.5wt% of fumed silica

Amino Silane 1 wt%

15.12 wt% of Pearl Pigments,

0.08 wt% Catalyst is mixed to form a silicone sealant.

Next, a description will be given of a method for producing a silicone sealant using the components and component ratios shown in Example 1 above.

An important point in the production of the silicone sealant comprising the pearl is in the order of injecting the components into the reactor, and it is particularly important to inject the pearl pigment before the last input of the catalyst.

The reason why the injection order is important is that the pearl may be broken or the sealant product may be broken during the rubberizing (hardening) process when the order of injection is different.

Therefore, it is preferable to prepare the silicone sealant by injecting the components into the reactor in accordance with the order of introduction according to the present invention.

As for the production process of the silicone sealant,

After completion of the tertiary dispersion process, a catalyst is further added to the reactor, and the mixture is stirred at 400 to 500 rpm for quaternary dispersion.

A specific example of such a production process is as follows.

[0040] The polydimethylsiloxane, the silicone oil, the methyl oximino silane (MOS), the vinyl oximino silane (VOS), the fumed silica, the aminosilane Amino Silane, Pearl Pigments and Catalyst are sequentially introduced into a reactor equipped with a stirrer,

Polydimethylsiloxane, Silicone oil, Methyl Oximino Silane (MOS) and Vinyl Oximino Silane (VOS) were sequentially added thereto, followed by stirring at 450 rpm for 13 minutes to disperse.

Next, the above-mentioned aerosol silica (Fumed Silica) and aminosilane (Amino Silane) are sequentially added to the reactor and dispersed by stirring at 850 rpm for 10 minutes.

Next, the pearl pigments were put into a reactor and dispersed by stirring at 450 rpm for 7 minutes.

Next, the catalyst is put into the reactor and dispersed by stirring at 450 rpm for 7 minutes.

Claims

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A step of sequentially adding polydimethylsiloxane, silicone oil and Methyl Oximino Silane (MOS) to a reactor equipped with a stirrer, followed by primary dispersion by stirring at 400 to 500 rpm,
After completion of the primary dispersion process, fumed silica is further added to the reactor, followed by secondary dispersion by stirring at 800 to 900 rpm,
After completion of the secondary dispersion process, pearl pigments are further added to the reactor and the mixture is stirred at 400 to 500 rpm for tertiary dispersion,
And further adding a catalyst to the reactor after the third dispersion process and stirring the mixture at 400 to 500 rpm to quaternary disperse the pellets.

The method of claim 4,
Wherein the pearl pigment is prepared by mixing dimethyl siloxane fluids and pearl in a weight ratio of 1: 1 to 1.2: 1 and then firing the pearl pigment.