KR101125213B1 - Sliding prevention facilities for the road and constructing method of the same - Google Patents

Abstract

PURPOSE: Facility and construction method of preventing the slipping of road surface are provided to ensure an excellent film shape with high viscosity using MMA as base and talc and aluminum hydroxide as filler. CONSTITUTION: A facility of preventing the slipping of road surface comprises a primer layer(110), a lining layer(120) and a coated layer(130). The primer layer is formed by coating primer-layer forming composition on road surface(100). The primer forming composition comprises binder containing MMA(methylmetacrylate) resin, filler formed from talc and aluminum hydroxide, pigment, additive, and hardener. The lining layer is formed by spraying a frictional material on the top of the primer layer. The frictional material comprises aluminum oxide. The coated layer is formed by coating coated-layer forming composition on the top of the lining layer.

Description

Sliding prevention facilities for the road and constructing method of the same}

The present invention relates to a non-slip facility of the road surface and a construction method thereof.

Roads with steep slopes or roads with severe curves are likely to cause road departures and vehicle rollovers due to vehicle slippage. In order to prevent this, a non-slip facility is installed on the road surface, and a non-slip facility of the road surface is usually installed by applying a non-slip agent to the road surface.

Recently, anti-skid facilities are installed on the surface of invo- ding, driveway, bicycle road, child protection area, park area, bus lane, building rooftop concrete, steel car parking lot to protect the safety of pedestrians and passengers. The need is increasing gradually.

In general, various kinds of resins are applied to an anti-slip agent applied to an anti-slip facility. In recent years, the use of methyl methacrylate (MMA) having excellent price / performance ratio as a main agent in an anti-slip agent is increasing.

However, in the case of MMA, the coating film formability is lowered due to the low viscosity, and the strength is low, so that the wear progresses rapidly and the durability is lowered. In order to increase the viscosity of the anti-slip agent, it is necessary to add less MMA and add an excessive amount of filler. In this case, elongation, which is inherent in the MMA resin, decreases, and adhesion to the road surface occurs.

Therefore, the present invention, while using the MMA as a main material, the viscosity is high, excellent film formability, maintaining the elongation which is an advantage of the MMA resin, high bonding strength and high adhesion to the road surface to provide a non-slip facility excellent in durability. have.

Furthermore, another object of the present invention is to provide a construction method capable of effectively forming the anti-slip facility.

In order to achieve the above object, the present invention is to apply a composition for forming a bottom layer comprising a filler, a pigment, an additive and a curing agent by mixing a binder, talc and aluminum hydroxide containing MMA (methylmetacrylate) resin on the upper surface of the road surface Formed undercoat; A middle layer formed by spraying a friction material including aluminum oxide on the upper surface of the undercoat layer; And a top coat layer formed by applying a composition for forming a top coat layer including a binder, talc, a pigment, and a curing agent including an MMA (methylmetacrylate) resin on an upper surface of the middle layer. do.

The composition for forming the undercoat layer is 30 to 60 parts by weight of MMA (methylmetacrylate) resin, 5 to 30 parts by weight of unsaturated polyester resin, 0.5 to 5 parts by weight of urea resin, asphalt resin 5 20 parts by weight to 20 parts by weight, 20 to 45 parts by weight of a filler mixed with talc and aluminum hydroxide, 2 to 7 parts by weight of pigment, 0.5 to 1.5 parts by weight of a dispersant, 0.5 to 1.5 parts by weight of an antifoaming agent, and 1.5 to 3 parts by weight of a curing agent, The composition for forming the top coat layer is composed of 70 to 80 parts by weight of MMA (methylmetacrylate) resin, 5 to 20 parts by weight of talc, 5 to 15 parts by weight of pigment and 1.5 to 3 parts by weight of a curing agent based on 100 parts by weight of the composition for forming a top layer. Can be.

The filler may be obtained by mixing talc and aluminum hydroxide in a weight ratio of 4: 6 to 6: 4. Preferably, the filler may be obtained by mixing talc and aluminum hydroxide in a weight ratio of 5: 5.

In order to achieve the above object of the present invention, the present invention is for forming an undercoat layer comprising a binder, a talc, and aluminum hydroxide mixed with a binder containing a MMA (methylmetacrylate) resin on an upper surface of a road surface. Applying the composition to form an undercoat layer; Forming a middle layer by spraying a friction material including aluminum oxide on the upper surface of the undercoat layer; And forming a top coat layer by applying a composition for forming a top coat layer including a binder, talc, a pigment, and a curing agent including an MMA (methylmetacrylate) resin on the top surface of the middle coat layer. Provide construction methods for prevention facilities.

The anti-slip facility according to the present invention has excellent viscosity and high bondability by using talc and aluminum hydroxide as a filler while using MMA as a main material, and has excellent durability as well as high adhesion to the road surface. It shows the effect, in particular, it has the advantage that the working time is short within 1 hour as fast curing.

1 is a view schematically showing a cross section of an anti-slip facility according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, which are presented to aid the understanding of the present invention, but the present invention is not limited thereto.

1 is a view schematically showing a cross section of an anti-slip facility according to an embodiment of the present invention.

As illustrated in FIG. 1, the anti-slip facility according to the present invention includes an undercoat layer 110, a middle layer 120, and a top coat layer 130 sequentially formed on the road surface 100.

In the present invention, in order to construct an anti-slip facility having the above-described configuration, the first step is to form the undercoat layer 110 on the road surface 100.

The road surface 100 on which the anti-slip facility is formed may be concrete or asphalt road, and cleaning is performed before forming the undercoat layer 110. In order for the undercoat 110 to be firmly attached to the road surface 100, a scratching operation may be selectively performed.

The forming of the undercoat layer 110 is a step of applying the composition for forming the undercoat layer to the road surface 100.

According to the present invention, the composition for forming the undercoat layer comprises a binder containing a MMA (methylmetacrylate) resin, a filler, a pigment, an additive, and a curing agent obtained by mixing talc and aluminum hydroxide.

Here, the binder is preferably made of MMA, unsaturated polyester resin, urea resin, asphalt resin.

Preferably the composition for forming the undercoat layer is 30 to 60 parts by weight of MMA (methylmetacrylate) resin, 5 to 30 parts by weight of unsaturated polyester resin, 0.5 to 5 parts by weight of urea resin, asphalt 5 to 20 parts by weight of a resin, 20 to 45 parts by weight of a filler obtained by mixing talc and aluminum hydroxide, 2 to 7 parts by weight of a pigment, 0.5 to 1.5 parts by weight of a dispersant, 0.5 to 1.5 parts by weight of an antifoaming agent, and 1.5 to 3 parts by weight of a curing agent. It is good to use that.

The MMA exhibits excellent penetrating power to the road surface and excellent adhesion. In this case, when the content of the MMA exceeds 60 parts by weight, the viscosity of the composition for forming the undercoating layer is low, and thus, the coating is not formed, thereby reducing workability and reducing the durability of the anti-slip facility. If the amount is less than 30 parts by weight, the amount of the resin component that serves as a binder is relatively low, and thus there is a disadvantage in that the adhesive strength is lowered and durability is lowered.

The unsaturated polyester resin is added to prevent the degradation of durability due to the wear resistance decrease by using MMA, when the content is less than 5 parts by weight has the disadvantage that the effect of improving the durability is insignificant, the content is more than 30 parts by weight There is a problem that the non-slip properties are not good because the content of other components is relatively reduced.

The unsaturated polyester resin can be used without limitation that is generally used in the art. For example, it is preferable that the unsaturated polyester resin is an ortho-phthalic acid-based unsaturated polyester, which has a low viscosity and is produced in a two-part type having fast curing property. Examples include Sewon Hwaseong P500, P501, P505, R-235, etc. In addition, Aekyung Chemical Co., Ltd. FR-200, FH103, FG-387, VE-604 can be used, but is not limited thereto. .

When a mixture of MMA and an unsaturated polyester resin is used as a resin that serves as a binder, fastness and excellent durability can be obtained.

The urea resin and the asphalt resin are added to improve adhesion, and the modified urea resin is preferably added in the range of 5 to 20 parts by weight within the range of 0.5 to 5 parts by weight. When the addition amount of the urea resin and the asphalt resin is out of the range, it is not possible to obtain an improved adhesion strength effect, so the urea resin and the asphalt resin may be added within the above range.

The asphalt resin can be used without limitation that is generally used in the art. The asphalt resin is widely used in road pavement materials, and is an oily substance produced by thermal decomposition by coal dry distillation, and mainly aromatic hydrocarbons, neutral components (naphthalins), oxygen-containing (taric acid), nitrogen-containing (tar base), and Contains sulfur (thiophene) compounds and is commercially available.

According to the present invention, a filler mixed with talc and aluminum hydroxide is added for the purpose of increasing the viscosity of the composition for forming the undercoat layer to prevent precipitation formation and to improve the compressive strength.

The talc and aluminum hydroxide are preferably mixed in a weight ratio of 4: 6 to 6: 4, and more preferably in a weight ratio of 5: 5. In addition, the filler is preferably added 20 to 45 parts by weight. When the mixing ratio of the talc and aluminum hydroxide and the amount of the filler added by mixing the talc and the aluminum hydroxide is out of the range, there is a disadvantage in that it does not sufficiently obtain the effect of preventing precipitation and improving the compressive strength of the composition for forming the undercoat layer. It is preferable to mix and add in the inside.

The pigment is added to obtain the desired color, it can be added to those commonly used in the art. For example, the pigment may include Phthalocyanine BLUE, Diazo Yellow, iron oxide black, or the like, but the present invention is not limited thereto. The pigment is preferably added in an amount of 2 parts by weight or more for sufficient color expression, and it is not necessary to exceed 7 parts by weight, so it is preferable to add 2 to 7 parts by weight of the pigment.

In order to increase the dispersibility of each component including the pigment, it is preferable to add a dispersant, and the dispersant may be added without limitation to those generally used in the art. If the dispersing agent is less than 0.5 parts by weight can not obtain a sufficient dispersing effect, if more than 1.5 parts by weight can no longer obtain an improved dispersing effect, it is preferable to add 0.5 to 1.5 parts by weight of the dispersing agent.

The antifoaming agent is added to ensure the safety of the composition for forming the undercoat layer by discharging the internal air to the outside, the antifoaming agent is selected from the group consisting of polyether-based, silicone-based, ethyl alcohol and ethylene glycol generally used in the art At least one of which may be used. When the antifoaming agent is added less than 0.5 parts by weight, it is not possible to obtain a sufficient defoaming effect, and when the antifoaming agent is more than 1.5 parts by weight, no improved antifoaming effect can be obtained.

The composition for forming an undercoat layer according to the present invention further includes a curing agent. The curing agent serves to cure the binder component contained in the composition for forming the undercoat layer. When the curing agent is added 1.5 to 3 parts by weight can be obtained a sufficient effect is preferably added within the above range.

The curing agent may be used that is generally used in the art. For example, benzoyl peroxide may be used as the curing agent.

The curing agent completes curing of the binder components in a short time, thereby reducing the overall construction time.

The curing agent may further include a curing accelerator, preferably 5 to 12 parts by weight based on 100 parts by weight of the curing accelerator.

The hardening accelerator may be one that is generally used in the art as increasing the curing rate. For example, the hardening accelerator may be a metal salt-based cobalt, tris (dimethylaminomethyl) phenol, or salicylic acid ( Salicylic Acid) and the like can be used.

The curing agent, which is formed as described above, is separately stored and added immediately before the composition for forming the undercoat layer is applied to the road surface.

The undercoat layer 110 may be obtained by applying the composition for forming the undercoat layer on the upper surface of the road surface 100. Since the thickness of the undercoat layer 110 may be selectively adjusted as necessary according to the surrounding situation, the thickness of the undercoat layer 110 may not be limited.

When the undercoat layer 110 is formed, the intermediate layer 120 is formed by spraying friction material on the upper surface of the undercoat layer 110.

The intermediate layer 120 is formed to increase the frictional force to prevent slipping. The friction material may comprise aluminum oxide. The aluminum oxide particles are preferably used having a size of 0.5 to 3mm, spinel structured aluminum oxide is particularly preferred because of the high strength properties.

The aluminum oxide is less than 20 times the wear amount compared to the silica sand frequently used as a friction material in the conventional anti-slip facility, easy to maintain and excellent in friction. Therefore, the overall height of the anti-slip layer formed on the road can be reduced.

Since the aluminum oxide has a disadvantage in that the unit price is high, a part of the aluminum oxide may be replaced with a low cost silica sand or the like, if necessary, and the aluminum oxide may preferably contain at least 50 to 90% by weight. When the content of aluminum oxide in the friction material is included in the above range can reduce the cost, can obtain a similar degree of friction strength to that used alone with aluminum oxide, superior to the top coat layer 130 and the undercoat layer 110 Has adhesion.

When the formation of the intermediate layer 120 is completed, a step of forming the top layer 130 by applying a composition for forming a top layer on the upper surface of the intermediate layer 120 is performed.

The composition for forming the top coat layer serves to prevent and protect the separation of the friction material and can effectively protect the particles of the friction material constituting the intermediate layer 120 from snow or rain, and the asphalt expands and contracts according to temperature changes. Even when such a change occurs, the friction material particles are not separated. In addition, it can be cured quickly to minimize the traffic jam due to delay in construction time.

According to the present invention, the composition for forming a top coat layer includes a binder, talc, a pigment, and a curing agent including an MMA (methylmetacrylate) resin.

Preferably, the composition for forming a top coat layer may be composed of 70 to 80 parts by weight of MMA (methylmetacrylate) resin, 5 to 20 parts by weight of talc, 5 to 15 parts by weight of pigment, and 1.5 to 3 parts by weight of a curing agent.

Since the MMA exhibits excellent penetrability and excellent adhesiveness, the MMA rapidly penetrates into the friction material of the intermediate layer 120 and exhibits excellent adhesive properties with the undercoat layer 110. Accordingly, the friction material serves to prevent the separation and to protect.

The MMA has a disadvantage in that workability is poor due to low viscosity of the composition for forming a top coat layer when the content thereof exceeds 80 parts by weight, and when the content is less than 70 parts by weight, the friction material has sufficient bonding strength. There is a drawback that the durability of the anti-skid facility is lowered because the friction material is easily released because it can not hold.

The talc contained in the composition for forming the top coat is used to increase the viscosity and to prevent precipitation, and it is preferable to add 5 to 20 parts by weight of the talc.

It is preferable that the said pigment uses the same thing used for the composition for undercoat layer forming. Therefore, the same color is applied twice, the anti-slip facility formed by the present invention does not change color even after a long time. The pigment is preferably contained 10 to 15 parts by weight.

The curing agent may be applied to those commonly used in the art, for example, may be used a curing agent used in the composition for forming the undercoat layer. It is preferable to add 1.5-3 weight part of said hardening | curing agents.

After applying the composition for forming a top coat layer configured as described above on the middle layer 120, and then compaction work using a hand roller or the like and curing for a certain period of time, the formation of the anti-slip facility according to the present invention is completed.

In this case, the lower layer 110, the intermediate layer 120 and the upper layer 130 need not be limited in thickness, and may be variously modified according to the surrounding situation. Preferably, the thickness of the undercoat layer 110 and the top coat layer 130 may be composed of a ratio of 2 to 5: 1, the thickness of the top coat layer 130 and the intermediate layer 120 is 1 to 5: 1 It can be composed of a ratio of.

The anti-slip facility according to the present invention formed as described above can be completed within 1 hour regardless of the external temperature as fast curing as the composition for forming the top coat layer and the composition for forming the undercoat layer as the main agent MMA as a binder The work time can be shortened. In particular, the anti-slip facility constructed according to the present invention exhibits excellent durability and elasticity.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are only presented to aid the understanding of the present invention and the present invention is not limited thereto.

≪ Example 1 >

The undercoat layer was applied to the surface of the asphalt road to form the undercoat layer. At this time, the composition for forming the undercoat layer is a mixture of 40 parts by weight of MMA (methylmetacrylate) resin, 12 parts by weight of unsaturated polyester resin, 2 parts by weight of urea resin, 8 parts by weight of asphalt resin, talc and aluminum hydroxide in a weight ratio of 5: 5. 30 parts by weight of filler, 3.5 parts by weight of pigment, 1 part by weight of dispersant, and 1 part by weight of antifoaming agent were mixed, followed by mixing 2.5 parts by weight of curing agent immediately before application. Here, the curing agent used was composed of 99 parts by weight of benzoyl peroxide and 1 part by weight of a curing accelerator.

Immediately after forming the undercoat layer, a middle layer was formed by spraying a friction material mixed with aluminum oxide having a spinel structure and silica sand at a weight ratio of 90:10.

On the intermediate layer, 75 parts by weight of MMA resin, 14 parts by weight of talc, 8 parts by weight of pigment, and 3 parts by weight of a curing agent were applied to form a top layer, thereby forming a top layer. At this time, the same curing agent used in the composition for forming the undercoat layer was used.

After 1 hour after the top layer was formed, the compactor was compacted using a handler to construct a non-slip facility having a thickness of 5 mm on the asphalt road surface.

<Example 2>

Except for the mixing ratio of talc and aluminum hydroxide 4: 6 was carried out in the same manner as in Example 1 to install a non-slip facility on the asphalt road surface.

<Example 3>

Except for the mixing ratio of talc and aluminum hydroxide to 6: 4 was carried out in the same manner as in Example 1 to install a non-slip facility on the asphalt road surface.

<Example 4>

Filler comprising 35 parts by weight of MMA (methylmetacrylate) resin, 5 parts by weight of unsaturated polyester resin, 1.5 parts by weight of urea resin, 5 parts by weight of asphalt resin, talc and aluminum hydroxide in a weight ratio of 5: 5. Asphalt road surface was carried out in the same manner as in Example 1, except that 45 parts by weight, 4.5 parts by weight of pigment, 1 part by weight of dispersant, and 1 part by weight of antifoam were mixed, followed by mixing 2.5 parts by weight of a curing agent immediately before application. An anti-slip facility was constructed.

Comparative Example 1

52 parts by weight of unsaturated polyester resin, 10 parts by weight of asphalt resin, 30 parts by weight of silicon, 3.5 parts by weight of pigment, 1 part by weight of dispersant, and 1 part by weight of antifoaming agent were mixed with the composition for forming the undercoat layer. Except for using the one produced by mixing the part was carried out in the same manner as in Example 1 to construct a non-slip facility on the asphalt road surface.

Comparative Example 2

Except for the mixing ratio of talc and aluminum hydroxide 3: 7 was carried out in the same manner as in Example 1 to install a non-slip facility on the asphalt road surface.

Comparative Example 3

Except for the mixing ratio of talc and aluminum hydroxide 7: 3 was carried out in the same manner as in Example 1 to construct a non-slip facility on the asphalt road surface.

<Comparative Example 4>

Filler comprising 30 parts by weight of MMA (methylmetacrylate) resin, 5 parts by weight of unsaturated polyester resin, 1 part by weight of urea resin, 5 parts by weight of asphalt resin, talc and aluminum hydroxide in a weight ratio of 5: 5. Asphalt road surface was carried out in the same manner as in Example 1, except that 50 parts by weight, 4.5 parts by weight of pigment, 1 part by weight of dispersant, and 1 part by weight of antifoam were mixed, followed by mixing 2.5 parts by weight of a curing agent immediately before application. An anti-slip facility was constructed.

Experimental Example

Abrasion resistance (standard: 200 or less at mg / 100 rotation) and compressive strength (standard: 120kgf / cm2 or more at 20 ° C), KS F 2375, according to the KS M 5333 standard for the anti-slip facilities manufactured in the above Examples and Comparative Examples According to the sliding resistance (reference: 65BPN or more) was measured and the results are shown in Table 1 below. In addition, after the compressive strength test, the surface state of the coating film was visually confirmed, and then the presence or absence of peeling was determined.

In addition, the viscosity of the composition for forming the undercoat layer at the time of manufacturing the anti-slip facility was evaluated as follows from the viewpoint of workability and the results are shown in Table 1 below.

- Viscosity

◎: Excellent workability

○: workability is normal

×: poor workability

division Wear resistance Compressive strength
(kgf / cm2) Coating
Surface condition Slip Resistance (BPN) Viscosity Example 1 78 216 No peeling 91 ◎ Example 2 89 194 No peeling 82 ◎ Example 3 84 207 No peeling 88 ◎ Example 4 121 164 No peeling 74 ○ Comparative Example 1 228 118 Peeling Occurrence 61 × Comparative Example 2 186 138 No peeling 66 ◎ Comparative Example 3 164 142 No peeling 69 ◎ Comparative Example 4 197 127 Peeling Occurrence 62 ×

As shown in Table 1, in the case of Examples 1 to 4 in which talc and aluminum hydroxide were mixed as a filler while using MMA as a main agent of the binder according to the present invention, silicon was used as the filler while the unsaturated polyester was used as the binder. It can be seen that the wear resistance, compressive strength, slip resistance and viscosity characteristics are all excellent compared to Comparative Example 1 using. Comparative Examples 2 and 3 correspond to the case where the ratio of talc and aluminum hydroxide used as the filler is outside the preferred range of the present invention, and Comparative Example 4 corresponds to the case where the addition amount is outside the preferred range of the present invention. It can be seen that the physical properties are somewhat inferior to 1 to 4.

Claims (8)

delete An undercoating layer formed by applying a composition for forming an undercoating layer including a binder including MMA (methylmetacrylate) resin, a filler, a pigment, an additive, and a curing agent obtained by mixing talc and aluminum hydroxide;
A middle layer formed by spraying a friction material including aluminum oxide on the upper surface of the undercoat layer; And
In the anti-slip facility of the road surface comprising a top coat layer formed by applying a composition for forming a top coat layer comprising a binder, talc, pigment and a curing agent comprising a MMA (methylmetacrylate) resin on the upper surface of the intermediate layer,
The composition for forming the undercoat layer is 30 to 60 parts by weight of MMA (methylmetacrylate) resin, 5 to 30 parts by weight of unsaturated polyester resin, 0.5 to 5 parts by weight of urea resin, asphalt resin 5 20 parts by weight to 20 parts by weight, 20 to 45 parts by weight of a filler mixed with talc and aluminum hydroxide, 2 to 7 parts by weight of pigment, 0.5 to 1.5 parts by weight of a dispersant, 0.5 to 1.5 parts by weight of an antifoaming agent, and 1.5 to 3 parts by weight of a curing agent,
The composition for forming the top coat layer is composed of 70 to 80 parts by weight of MMA (methylmetacrylate) resin, 5 to 20 parts by weight of talc, 5 to 15 parts by weight of pigment and 1.5 to 3 parts by weight of a curing agent based on 100 parts by weight of the composition for forming a top layer. The anti-slip facility of the road surface characterized by the above-mentioned. The non-slip facility of claim 2, wherein the filler is obtained by mixing talc and aluminum hydroxide in a weight ratio of 4: 6 to 6: 4. The anti-skid facility on a road surface according to claim 2, wherein the filler is obtained by mixing talc and aluminum hydroxide in a weight ratio of 5: 5. Forming a bottom layer by applying a composition for forming a bottom layer comprising a filler, a pigment, an additive, and a curing agent, the binder including a binder containing MMA (methylmetacrylate) resin, talc, and aluminum hydroxide;
Forming a middle layer by spraying a friction material including aluminum oxide on the upper surface of the undercoat layer; And
Anti-slip of the road surface comprising a; applying a composition for forming a top layer layer comprising a binder, talc, pigment and a curing agent comprising a MMA (methylmetacrylate) resin on the upper surface of the intermediate layer; Construction method of facility. The composition of claim 5, wherein the composition for forming the undercoat layer is 30 to 60 parts by weight of MMA (methylmetacrylate) resin, 5 to 30 parts by weight of unsaturated polyester resin, and 0.5 to 5 parts by weight of urea resin, based on 100 parts by weight of the composition for forming the undercoat layer. Part, 5 to 20 parts by weight of asphalt resin, 20 to 45 parts by weight of a filler obtained by mixing talc and aluminum hydroxide, 2 to 7 parts by weight of pigment, 0.5 to 1.5 parts by weight of dispersant, 0.5 to 1.5 parts by weight of antifoaming agent, and 1.5 to 3 hardener. Consisting of parts by weight,
The composition for forming the top coat layer is composed of 70 to 80 parts by weight of MMA (methylmetacrylate) resin, 5 to 20 parts by weight of talc, 5 to 15 parts by weight of pigment and 1.5 to 3 parts by weight of a curing agent based on 100 parts by weight of the composition for forming a top layer. The construction method of the slip prevention facility of the road surface characterized by the above-mentioned. The method of claim 5 or 6, wherein the filler is made by mixing talc and aluminum hydroxide in a weight ratio of 4: 6 to 6: 4. The method of claim 5 or 6, wherein the filler is made by mixing talc and aluminum hydroxide in a weight ratio of 5: 5.

Images