KR102069853B1 - Composition for preventing sagging - Google Patents

Abstract

The present invention relates to a composition for preventing sagging, and can significantly improve the sagging prevention performance of a gypsum board.

Description

Composition for preventing sagging {Composition for preventing sagging}

It relates to a composition for preventing sagging and a gypsum board composition comprising the same.

Gypsum is one of the most used materials in modern architecture. Gypsum products are prepared by casting a mixture of hydrated gypsum (hydrate of calcium sulfate or calcium sulphate hemihydrate or anhydrous calcium sulfate or a mixture thereof) and water, where hydrated gypsum is hydrated with water to form a crystalline hydrated gypsum matrix (calcium sulfate dihydrate). Solidified gypsum constituting water) is formed, and the gypsum product thus formed has a high structural strength. As such, gypsum products are widely applied to buildings because of their light weight and high strength.

Particularly, gypsum boards among gypsum products are mainly used for ceiling construction of buildings such as commercial and educational facilities, and are widely used because of advantages such as heat insulation and non-combustibility and easy construction. However, when gypsum products such as gypsum boards are subjected to high humidity conditions for a long time, deformation behavior called sagging or displacement with humidity in the art may occur. The gypsum product, which has undergone such deformation behavior after installation, not only has a poor aesthetic appearance, but also has a high cost to improve it. Accordingly, in the field of construction, research is being actively conducted to develop a technology that can overcome the poor deformation behavior of solidified gypsum. For example, British Patent Publication GB1481788A discloses a method of using gallic acid as an anti-sagging additive to improve anti-sagging of gypsum board. British Patent GB 1226333A suggests that ready-made gypsum plaster sheets and slabs and blocks comprising tartaric acid have a greater resistance to plastic flow than similar materials that do not contain tartaric acid.

The gypsum boards developed so far do not have good anti-sagging performance.They produce gypsum board products with a width of 450 mm and sag over time when the ceiling is constructed with 450 mm M bar spacing. There is a fear that the problem will eventually grow and cause the ceiling to collapse. Accordingly, in Korea, only 300 mm wide gypsum board is in circulation. Accordingly, the interval of the M bar is limited to 300 mm when the ceiling is installed, and there is a problem in that the efficiency in construction is lowered.

The present invention provides a composition for preventing sagging.

In addition, the present invention provides a gypsum board that can be applied at intervals of 450 mm M bar by improving the anti-sagging performance of the gypsum board by applying the anti-sagging composition.

The present invention provides a sagging prevention composition comprising a sulfonic acid metal salt, oxidized starch, phosphonate and boric acid.

The present invention also provides a gypsum board composition comprising a gypsum, a hardener and the anti-sagging composition.

The anti-sagging composition of the present invention significantly improves the anti-sagging performance of the gypsum board, so that the existing M Bar, which could only be installed at 300 mm intervals, can be expanded at 450 mm intervals, thus preventing ceilings. Not only the material cost of the construction is reduced, but the cost of construction can be expected to be reduced by reducing the labor cost by shortening the process, and there is almost no deformation caused by sagging after construction, which has the effect of improving customer quality satisfaction.

Hereinafter, the present invention will be described in detail.

Sagging  Prevention composition

The present invention provides a composition for preventing sagging.

The anti-sagging composition of the present invention includes a sulfonic acid metal salt, starch oxide, phosphonate and boric acid. Hereinafter, the components constituting the composition will be described in detail.

<Sulfonic acid metal salts>

The sulfonic acid metal salt included in the anti-sagging composition of the present invention is a component that provides fluidity of the gypsum board composition, adjusts the amount of water mixing and improves sagging performance, and has been used conventionally by applying the sulfonic acid metal salt. Compared with the metal phosphate salt, the hardness, compressive strength, and foam can be exhibited.

The sulfonic acid metal salt may be a metal salt of sulfonic acid, and the metal of the metal salt may be a monovalent metal or a divalent metal.

The monovalent metal may be lithium (Li ⁺ ), sodium (Na ⁺ ), potassium (K ⁺ ), rubidium (Rb ⁺ ), cesium (Cs ⁺ ) or francium (Fr ⁺ ).

The divalent metal is beryllium (Be ^{2 +} ), magnesium (Mg ^{2 +} ), calcium (Ca ^{2 +} ), strontium (Sr ^{2 +} ), barium (Ba ²⁺ ), lithium (Ra ^{2 +} ), copper (Cu ^{2 +} ), zinc (Zn ^{2 +} ), cadmium (Cd ^{2 +} ), and the like.

<Oxidized starch>

Oxidized starch included in the anti-sagging composition of the present invention is a component for improving the adhesion in the composition, it can express an excellent adhesion as an anti-sagging composition as compared to gelatinized starch, acid modified starch, general starch or other treated starch. have.

The content of the starch oxide may be 10 parts by weight to 50 parts by weight with respect to 100 parts by weight of sulfonic acid metal salt, and another example may be 20 parts by weight to 40 parts by weight. When the starch content is out of the content, the adhesion and the sagging prevention effect may be lowered.

<Phosphonate>

Phosphonate included in the anti-sagging composition of the present invention is a component that further enhances the anti-sagging performance in the composition, the phosphonate is sodium phosphonate, potassium phosphonate, lithium phosphonate, magnesium phosphonate, calcium phosphonate, etc. Can be. The phosphonate may be a phosphonate including an alkyl group having 1 to 10 carbon atoms.

The content of the phosphonate salt may be 1 part by weight to 25 parts by weight based on 100 parts by weight of sulfonic acid metal salt, and another example may be 5 parts by weight to 20 parts by weight. When the content of the phosphonate salt is less than 1 part by weight, there may be a problem that the sagging prevention effect is lowered, and when it exceeds 25 parts by weight, economic problems may occur.

Boric acid

Boric acid contained in the anti-sagging composition of the present invention is a component that further enhances the anti-sagging performance in the composition.

The boric acid content may be 10 parts by weight to 150 parts by weight with respect to 100 parts by weight of sulfonic acid metal salt, and another example may be 50 parts by weight to 100 parts by weight. When the content of the boric acid is less than 10 parts by weight may have a problem that the anti-sagging effect is lowered, if it exceeds 150 parts by weight may cause a problem of curing delay.

<Other substances>

The anti-sagging composition of the present invention may further comprise lactic acid alumina.

The content of the lactic acid alumina may be 50 parts by weight to 200 parts by weight based on 100 parts by weight of sulfonic acid metal salt, and another example may be 100 parts by weight to 150 parts by weight.

Gypsum board composition

In addition, the present invention provides a gypsum board composition comprising the anti-sagging composition.

The gypsum board composition of the present invention includes a gypsum, a hardener, and the anti-sagging composition. Hereinafter, the components constituting the gypsum board composition will be described in detail.

<Plaster>

Gypsum board composition of the present invention comprises a calcined gypsum, the calcined gypsum is calcium sulfate as a major component of gypsum dihydrate (CaSO ₄ and 2H ₂ O) in yisuseok expensive calcined calcium sulfate hemihydrate (CaSO ₄ and 1 / 2H ₂ O It may be a half-member plaster.

The content of the gypsum may be from 80% by weight to 95% by weight with respect to the total gypsum board composition, another example may be from 85% by weight to 95% by weight.

<Hardener>

The gypsum board composition of the present invention includes a curing agent, the curing agent may be used to promote the hardening of the plaster, for example potassium sulfate, sodium sulfate, aluminum sulfate and the like.

The content of the curing agent may be 0.01 parts by weight to 1.5 parts by weight with respect to 100 parts by weight of calcined gypsum, and another example may be 0.11 parts by weight to 1.2 parts by weight. When the content of the curing agent is less than 0.01 parts by weight, the strength of the gypsum board may be lowered, and when it exceeds 1.5 parts by weight, the physical properties of the gypsum board may be lowered.

<Sagging prevention composition>

The anti-sagging composition included in the gypsum board composition of the present invention is the same as described in the item 'Anti-sagging composition', and includes a sulfonate metal salt, starch oxide, phosphonate and boric acid. The content of the anti-sagging composition may be 0.25 parts by weight to 5 parts by weight based on 100 parts by weight of plaster, and another example may be 0.4 parts by weight to 3 parts by weight. When the content of the anti-sagging composition is out of the content, the anti-sagging effect may be lowered or economic problems and curing delay problems may occur.

The sulfonic acid metal salt is used as a water reducing agent in the gypsum board composition. Conventionally, a metal phosphate salt or the like was used as a water reducing agent. In the present invention, a sulfonic acid metal salt is applied as a water reducing agent.

The sulfonic acid metal salt is a component capable of imparting fluidity of the gypsum board composition and controlling water miscibility and improving sagging performance. By applying the sulfonic acid metal salt, the sulfonic acid metal salt has excellent hardness, compared to the metal phosphate salt used in the related art. Compressive strength and bubble shape. The sulfonic acid metal salt may be a metal salt of sulfonic acid, the metal of the metal salt may be a monovalent metal or a divalent metal, for example, a calcium salt of sulfonic acid. The content of the sulfonic acid metal salt may be 0.01 part by weight to 2 parts by weight with respect to 100 parts by weight of calcined gypsum, and another example may be 0.1 part by weight to 1.5 parts by weight. When the content of the sulfonic acid metal salt is less than 0.01 parts by weight, the amount of water is increased to increase the moldability and economical efficiency in the manufacture of gypsum board, and when it exceeds 2 parts by weight, the fluidity of the gypsum board composition is excessively increased to make The formability and workability of the board may be degraded.

The starch is used as an adhesive in the gypsum board composition. Conventionally, gelatinized starch, acid modified starch, general starch and the like have been used as an adhesive. In the present invention, an oxidized starch is applied as an adhesive.

The oxidized starch is a component for improving the adhesion in the composition, it can express an excellent adhesion as a sagging prevention composition compared to gelatinized starch, acid modified starch, general starch or other treated starch. In addition, the content of the oxidized starch may be 0.05 parts by weight to 1.0 parts by weight with respect to 100 parts by weight of calcined gypsum, another example may be 0.1 parts by weight to 0.6 parts by weight.

The phosphonate is a component that further enhances anti-sagging performance in the composition, and the phosphonate may be sodium phosphonate, potassium phosphonate, lithium phosphonate, magnesium phosphonate, calcium phosphonate, or the like. The phosphonate may be a phosphonate including an alkyl group having 1 to 10 carbon atoms. In addition, the content of the phosphonate salt may be 0.005 parts by weight to 0.5 parts by weight with respect to 100 parts by weight of calcined gypsum, another example may be 0.01 parts by weight to 0.25 parts by weight.

The boric acid is a component that further enhances anti-sagging performance in the composition. In addition, the boric acid content may be 0.01 parts by weight to 1.5 parts by weight with respect to 100 parts by weight of calcined gypsum, and another example may be 0.1 parts by weight to 1.2 parts by weight. The sagging prevention composition may further comprise lactic acid alumina.

<Other substances>

The gypsum board composition of the present invention may further include a base paper as a coating material on the surface or the back of the gypsum board, and the base paper may be a base paper made of cellulose as a raw material.

In addition, the gypsum board composition of the present invention may further include a foaming agent as a structural agent for the weight of the gypsum board is cured and manufactured.

Furthermore, the gypsum board composition of the present invention may further include a retarder to retard condensation of the gypsum to improve fluidity.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples.

However, these examples are only for the purpose of understanding the present invention, and the scope of the present invention in any sense is not limited to these examples and experimental examples.

< Example  1 to 11> Preparation of Gypsum Boards

[1-1] Preparation of Gypsum Boards Composition

A gypsum board composition was prepared using the ingredients and compositions as described in Table 1 below. The input amount of each raw material was expressed in parts by weight relative to the plaster, and when mixing the following raw materials, the blowing agent was mixed with water and foamed through an air generator, followed by mixing with other raw materials except for raw paper to prepare the gypsum board composition of Examples 1 to 11. It was.

[1-2] Preparation of gypsum board

As soon as the mixing of the gypsum board composition as described above is finished, the mixed sludge prepared as described above is put between two sheets of 0.95 mm base paper, and then solidified to prepare a gypsum board.

< Comparative example  1 to 8

A gypsum board composition of Comparative Examples 1 to 8 was prepared in the same manner as in Example 1, except that the composition and composition of the composition were changed as shown in Table 2 below, to prepare a gypsum board.

ingredient Example One 2 3 4 5 6 7 8 9 10 Plaster CaSO ₄ ㆍ 1 / 2H ₂ O 100 100 100 100 100 100 100 100 100 100 Hardener K ₂ SO ₄ 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 blowing agent R ₁ O (CH ₂ CH ₂ O) _n SO ₃ NH ₄ ,
R1: CH3 (CH2) n, n = 11 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 Retardant Naphthalene Sulphonic Acid Formalin Condensate 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Sulfonic acid metal salts 2-amino-1,5-naphthalenedisulfonic acid calcium salt One 0.5 One One One One One 1.5 One One Starch oxide Starch oxide 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.3 0.2 0.2 Phosphonate1 R ₂ PO (OH) (ONa),
R2: CH3 (CH2) m, m = 1 0.1 0.1 0.05 0.15 0.1 0.15 0.1 Phosphonate 2 R ₂ PO (OH) (ONa),
R2: CH3 (CH2) m, m = 2 0.1 0.05 0.25 Boric acid H ₃ BO ₃ 0.5 0.5 0.5 0.5 0.7 0.5 0.5 0.75 0.5 0.85 water H ₂ O 70 70 70 70 70 70 70 70 70 70

ingredient Comparative example One 2 3 4 5 6 7 8 Plaster CaSO ₄ ㆍ 1 / 2H ₂ O 100 100 100 100 100 100 100 100 Hardener K ₂ SO ₄ 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 blowing agent R ₁ O (CH ₂ CH ₂ O) _n SO ₃ NH ₄ ,
R1: CH3 (CH2) n, n = 11 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 Retardant Naphthalene Sulphonic Acid Formalin Condensate 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Sulfonic acid metal salts 2-amino-1,5-naphthalenedisulfonic acid calcium salt One One One 2.2 One One Calcium Phosphate Calcium trimetaphosphate One Starch oxide Starch oxide 0.2 0.2 0.2 0.2 0.2 0.44 0.2 0.2 Phosphonate1 R ₂ PO (OH) (ONa),
R2: CH3 (CH2) m, m = 1 0.1 0.1 0.22 0.28 0.1 Boric acid H ₃ BO ₃ 0.5 0.5 1.1 0.5 1.6 water H ₂ O 70 70 70 70 70 70 70 70

< Experimental Example > Property Evaluation

In order to confirm the physical properties of the gypsum board composition according to the present invention, the physical properties of the gypsum board composition prepared in Examples 1 to 11 and Comparative Examples 1 to 8 and the gypsum board manufactured using the same were evaluated through the following experiment, The results are shown in Tables 3 and 4.

(1) liquidity

The fluidity was measured in Table 1 and Table 2 after mixing the raw materials except the raw paper, filling the slump cone with the slump cone, lifting the slump cone after 20 seconds of mixing to measure the degree of the sludge spread. The slump cone used a metal frustoconical cone having a bottom inner diameter of 20 cm, a top inner diameter of 10 cm, and a height of 30 cm.

(2) hardness

Hardness was measured according to the hardness measurement method of ASTM C-473 gypsum board prepared according to Table 1 and Table 2.

(3) compressive strength

Compressive strength was measured after mixing the raw material except the base paper in Table 1 and Table 2, and then put the sludge in a cube of 5cm * 5cm * 5cm, and then measured the maximum value when pressing.

(4) sagging performance

The composition according to Table 1 and Table 2 was measured according to the sagging measurement method of ASTM C-473.

(5) bubble form

In the gypsum board prepared according to Table 1 and Table 2, there is a bubble structure due to the foaming liquid of the foaming agent, and after observing this through an optical microscope, the size thereof was measured.

Properties Example One 2 3 4 5 6 7 8 9 10 11 Fluidity (mm) 110 96 105 117 119 107 98 120 111 115 113 Hardness (N) 225 230 217 223 221 231 229 225 220 219 223 Compressive strength ( MPa ) 5.5 5.7 5.1 5.3 5.5 5.3 5.5 5.41 5.2 5.4 5.6 Sagging  Performance (mm) 1.79 1.91 1.8 1.67 1.51 1.97 2.01 1.81 1.74 1.71 1.68 Bubble form (㎛) 354 371 361 355 373 358 367 363 358 351 350

Properties Comparative example One 2 3 4 5 6 7 8 Fluidity (mm) 116 51 111 105 110 116 112 112 Hardness (N) 230 107 230 229 225 231 215 213 Compressive strength ( MPa ) 5.9 3.2 5.6 5.5 5.5 3.8 3.5 3.6 Sagging  Performance (mm) 7.22 5.8 5.57 6.3 6.41 4.8 5.1 5.8 Bubble form (㎛) 332 120 360 367 349 305 320 326

Claims (7)

Sulfonic acid metal salts; Oxidized starch; Phosphonates; And boric acid,
The anti-sgging composition comprising the phosphonate salt in an amount of 1 to 25 parts by weight based on 100 parts by weight of the sulfonic acid metal salt.
The method according to claim 1,
The sulfonic acid metal salt is a sagging prevention composition for the monovalent or divalent metal salt of sulfonic acid.
The method according to claim 1,
The content of the starch oxide is anti sagging composition of 10 to 50 parts by weight based on 100 parts by weight of sulfonic acid metal salt.
delete The method according to claim 1,
The content of the boric acid is 10 parts to 150 parts by weight based on 100 parts by weight of sulfonic acid metal salt sagging prevention composition.
Calcined gypsum;
Curing agent; And
A sagging-preventing composition comprising a sulfonic acid metal salt, oxidized starch, phosphonate and boric acid,
The anti-sagging composition, gypsum board composition comprising the phosphonic acid salt in an amount of 1 to 25 parts by weight based on 100 parts by weight of the sulfonic acid metal salt.
The method according to claim 6,
The content of the anti-sagging composition is a gypsum board composition of 0.25 parts by weight to 5 parts by weight based on 100 parts by weight of plaster.