KR102542011B1 - Hygroscopic foam granules for multi-layer glass and multi-layer glass equipped with the same - Google Patents

Abstract

The present invention relates to hygroscopic expanded granules prepared by mixing a polymer and a hygroscopic agent and foaming them. Specifically, it relates to hygroscopic foam granules for double-glazed glass, which are excellent in moisture absorption and release resistance, and at the same time, have excellent stability.

Description

Hygroscopic foam granules for double glazing and double glazing having the same

The present invention relates to hygroscopic expanded granules prepared by mixing a polymer and a hygroscopic agent and foaming them. Specifically, it relates to hygroscopic foam granules for double-glazed glass, which are excellent in moisture absorption and release resistance, and at the same time, have excellent stability.

In general, double-glazed glass forms a certain space between the inside and outside of the glass and makes the space a vacuum state, thereby reducing the loss of indoor heat energy and blocking outdoor noise to maintain a more comfortable indoor environment. There are advantages to having it.

Spacers for double glazing are installed between the glass installed on the window frame or sash that divides the indoors and outdoors of the building, especially between the double-layered glasses, to maintain the double-glazed windows at regular intervals and to enhance the aesthetics of the double-glazed windows. It has the characteristics of improving the heat insulation and sound insulation effect.

In addition, in the spacer, a moisture absorbent is sealed to keep the air layer in a dry state, so that the thermal resistance of the sealed air layer has an insulation effect, thereby reducing the cooling and heating load, thereby providing excellent energy saving, and also the internal and external air gap. It also functions to suppress condensation caused by

As the moisture absorbent included in the spacer, a porous material such as zeolite and a deliquescent material such as magnesium oxide (MgO), calcium carbonate (CaCO ₃ ), and barium oxide (BaO) are generally used. In the case of the porous material absorbent, the moisture absorption rate is low and the specific gravity is heavy, which may hinder the durability of the spacer. In addition, when the deliquescent material is used, the moisture absorption rate is good, but the specific gravity is relatively large. In particular, when the humidity is very high, such as during the rainy season, it is completely dissolved due to the strong deliquescent property. Secondary damage may also occur.

Accordingly, it is necessary to study a moisture absorbent suitable for use in the spacer space of the double-glazed glass, excellent in hygroscopicity and durability, and particularly excellent in emission resistance, which can effectively prevent the insulation effect and condensation of the double-glazed glass.

Republic of Korea Patent Registration No. 10-2089956 (2020.03.11.)

The purpose of the present invention to solve the above problems is to increase the insulation effect when used in double-glazed glass because it has excellent hygroscopicity and low specific gravity compared to conventional moisture absorbents such as zeolite, which reduces the burden on the spacer structure, and also has excellent stability and emission resistance. It is to provide a moisture absorbent for double glazing that can effectively suppress condensation and prevent condensation.

The present invention comprises 20 to 70 parts by weight of hygroscopic material, 5 to 40 parts by weight of coagulant, 5 to 70 parts by weight of wax, 1 to 40 parts by weight of rust inhibitor and 0.1 to 10 parts by weight of foaming agent, based on 100 parts by weight of polyolefin resin. Effervescent granules are provided.

According to one aspect of the present invention, the hygroscopic material may include at least one selected from the group consisting of magnesium chloride, calcium chloride, sodium carbonate, sodium phosphate, sodium hydrogen carbonate, sodium citrate, sodium oxalate and sodium sulfate.

According to one aspect of the present invention, the expanded granules may further include 5 to 40 parts by weight of one or more metal oxides selected from the group consisting of magnesium oxide and calcium oxide.

According to one aspect of the present invention, the rust inhibitor may include one or more rust inhibitors selected from alkali metal-based benzoates and triazole-based compounds.

According to one aspect of the present invention, the wax may include one or two or more selected from polyethylene wax, polypropylene wax, polyamide wax, carnova wax, polytetrafluoroethylene wax, and polyolefin wax.

According to one aspect of the present invention, the coagulant is crosslinked polyacrylic salt, non-crosslinked polyacrylic salt, cellulose, superabsorbent cellulose resin, guar gum, xanthan gum, gum arabic, gum ghatti, rogerstbean gum, damma gum, gellan gum , rosin gum, karaya gum, copal gum, tara gum, tamarind gum, and tragacanth gum may include at least one selected from the group consisting of.

According to one aspect of the present invention, the foaming agent may include an azo-based chemical foaming agent.

According to one aspect of the present invention, the expanded granules may further include metal stearate.

According to one aspect of the present invention, it is possible to provide a composite glass including a double glass layer in which the expanded granules are filled in some or all of the edges between the glasses.

According to one aspect of the present invention, the composite glass may be filled with an inert gas between the glasses.

The hygroscopic foamed granules according to the present invention are prepared by foaming polymers, so they have low specific gravity and excellent durability, and are especially excellent in hygroscopicity, so they are suitable for use as a moisture absorbent for double-glazed glass.

In addition, the hygroscopic foam granules have low release resistance and can absorb moisture for a long period of time, so that dew condensation can be effectively suppressed for a long period of time, and at the same time, the insulation effect of the double-glazed glass can be further improved, and the anti-rust effect is excellent, so that excessive Even in humidity, it is possible to maintain the durability of the double-glazed glass by suppressing the occurrence of rust in the material of the double-glazed glass.

1 is an image showing an example of expanded granules.
2 is an image of an example of a double-glazed glass including a moisture absorbent.

Hereinafter, the present invention will be described in more detail through specific examples or examples including the accompanying drawings. However, the following specific examples or examples are only one reference for explaining the present invention in detail, but the present invention is not limited thereto, and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms used in the description in the present invention are merely to effectively describe specific embodiments and are not intended to limit the present invention.

Also, the singular forms used in the specification and appended claims may be intended to include the plural forms as well, unless the context dictates otherwise.

In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated.

A porous material such as zeolite is used as a moisture absorbent used in conventional double-glazing, but the porous material has problems such as a very low degree of moisture absorption, a very low stability and a high specific gravity, giving a load to the double-glazing structure.

In addition, powdery or granular moisture absorbents, such as magnesium oxide, have excellent hygroscopicity but poor stability, especially when humidity is excessively high, such as during the rainy season, and release resistance is poor. .

Accordingly, the present invention solves the above problems by preparing a composite moisture absorbing material including a hygroscopic material, a coagulant, an anticorrosive agent, and a wax, and providing expanded granules in the form of granules prepared by mixing and foaming the composite hygroscopic material with a polyolefin resin.

In the case of the foamed granules, they have excellent hygroscopicity, low specific gravity, and excellent release resistance, so that the humidity inside the double-glazed glass can be effectively lowered, thereby further increasing the insulation effect, especially in winter, and at the same time preventing dew condensation. .

More specifically, according to one aspect of the present invention, the foamed granules contain 20 to 70 parts by weight of hygroscopic material, 5 to 40 parts by weight of coagulant, 5 to 70 parts by weight of wax, and 1 to 40 parts by weight of rust inhibitor, based on 100 parts by weight of polyolefin resin. It may be foamed granules in the form of granules prepared from a composition containing 0.1 to 10 parts by weight of a foaming agent and a foaming agent.

Preferably, the expanded granules contain 30 to 60 parts by weight of hygroscopic material, 8 to 20 parts by weight of coagulant, 8 to 30 parts by weight of wax, 5 to 30 parts by weight of rust inhibitor, and 1 to 7 parts by weight of foaming agent, based on 100 parts by weight of polyolefin resin. It may be an expanded granule in the form of granules prepared from a composition comprising.

More preferably, the expanded granules contain 40 to 50 parts by weight of hygroscopic material, 8 to 15 parts by weight of flocculant, 15 to 25 parts by weight of wax, 15 to 25 parts by weight of rust inhibitor, and 1 to 5 parts by weight of foaming agent, based on 100 parts by weight of polyolefin resin. It may be expanded granules in the form of granules prepared from a composition containing part, but is not limited to the above content ranges.

In the case of expanded granules satisfying the above content, processability is excellent, and at the same time, moisture absorptivity, release resistance, and anti-corrosion effect can also be excellent at the same time.

In addition, in the case of the foamed granules, they are suitable for mass production due to their excellent processability and durability, and have a low specific gravity, so they can be injected in large quantities without difficulty in load even when inserted into the spacer of double-glazed glass.

The polyolefin-based resin is not limited as long as it is a commonly used polyolefin-based resin, but may preferably be a polyethylene resin, a linear low-density polyethylene resin, a low-density polyethylene resin, and a polypropylene resin, and more preferably a low-density polyethylene resin.

The polyolefin-based resin may have a melt index of 10 to 40 g / 10 min, preferably 10 to 30 g / 10 min, more preferably 20 to 30 g / 10 min, measured under the condition of 125 ° C. and 2.16 kg according to ASTM D1238. It may be 30 g/10 min, but is not limited thereto.

By using the polyolefin-based resin in the above melt index range, processability and durability are excellent, and in particular, it can be more uniformly mixed with the above materials such as the hygroscopic material, coagulant, wax, rust preventive and foaming agent.

According to one aspect of the present invention, the hygroscopic material is for imparting hygroscopicity, and as long as the type can realize hygroscopicity, it can be used without any significant restrictions. As specific examples, one or more selected from magnesium chloride, calcium chloride, sodium carbonate, sodium phosphate, sodium hydrogen carbonate, sodium citrate, sodium oxalate and sodium sulfate may be mentioned, but is not necessarily limited thereto. Preferably, at least one selected from among magnesium chloride, calcium chloride, and sodium carbonate may be used, and most preferably, magnesium chloride may be used.

The magnesium chloride may have a purity of 90 to 95%, and it can be confirmed that the moisture absorption effect of the expanded granules is excellent as the magnesium chloride is included in the expanded granules.

According to one aspect of the present invention, the wax may be one or two or more selected from polyethylene wax, polypropylene wax, polyamide wax, carnova wax, polytetrafluoroethylene wax, and polyolefin wax, preferably polyethylene wax and polypropylene wax, but is not limited thereto.

As the wax is included in the foamed granules, it functions to suppress the release of moisture absorbed and also controls the moisture absorption rate of the product, and it has excellent processability during extrusion to manufacture the foamed granules. It works.

According to one aspect of the present invention, the coagulant is crosslinked polyacrylic salt, non-crosslinked polyacrylic salt, cellulose, superabsorbent cellulose resin, guar gum, xanthan gum, gum arabic, gum ghatti, rogerstbean gum, damma gum, gellan gum It may be at least one selected from the group consisting of rosin gum, karaya gum, copal gum, tara gum, tamarind gum and tragacanth gum, preferably cellulose, superabsorbent cellulose resin and guar gum, but is limited thereto It is not.

As the foamed granules contain the coagulant, the release property of discharging excess moisture absorbed by the foamed granules to the outside can be lowered, and the moisture absorption capacity is also increased.

According to one aspect of the present invention, the rust inhibitor may be any one or more rust inhibitors selected from alkali metal-based benzoates and triazole-based compounds.

In the case of the alkali metal benzoate, it may be specifically any one or more selected from sodium benzoate, lithium benzoate and potassium benzoate, and the triazole-based compound is any one or more selected from benzotriazole and tolytriazole it could be

As the foamed granules contain the anti-rust agent, it is possible to suppress whitening or rusting of aluminum, which is mainly used as a spacer for double-glazed glass, and at the same time have excellent moisture absorption and release resistance due to the anti-rust effect.

In addition, according to one aspect of the present invention, the expanded granules may additionally include a metal oxide. Stability may be further improved by further including the metal oxide.

The metal oxide may include one or more selected from magnesium oxide, calcium oxide, and the like, but is not necessarily limited thereto.

The expanded granules may contain 5 to 40 parts by weight of at least one metal oxide selected from the group consisting of magnesium oxide and calcium oxide, preferably 8 to 20 parts by weight, and more preferably 8 to 15 parts by weight. However, it is not limited thereto.

The metal oxide may have a particle size of 30 to 500 mesh, and magnesium oxide among the metal oxides may be included in the expanded granules, so that the expanded granules may have better stability and durability.

As the expanded granules contain the metal oxide, deliquescence due to excessive moisture can be prevented, and thus the stability of the expanded granules can be improved.

In addition, according to one aspect of the present invention, the foamed granules may additionally include metal stearate. The metal stearate is not particularly limited in terms of achieving the objects and effects of the present invention, but may preferably be at least one selected from the group consisting of calcium stearate and magnesium stearate. When the expanded granules further contain metal stearate, the release rate can be further suppressed.

The metal stearate may be 1 to 20 parts by weight, preferably 3 to 15 parts by weight, more preferably 5 to 15 parts by weight, based on 100 parts by weight of the polyolefin resin, but is not limited thereto.

In addition, according to one aspect of the present invention, the foamed granules include those foamed by a foaming agent. The expanded granules are foams in the expanded form, and can have a wide specific surface area by changing the shape of porous pores or surfaces, and thus have the advantage of excellent moisture absorption effect.

According to one aspect of the present invention, the moisture absorbent composition may be prepared by extrusion foaming including 0.1 to 10 parts by weight of a foaming agent, preferably 1 to 7 parts by weight, more preferably 1 to 5 parts by weight. It may be, but is not limited thereto.

By using the foaming agent in the above range, the foamed granules have excellent durability and excellent specific surface area during extrusion, so that they can be processed smoothly and have excellent hygroscopicity.

In addition, as the content of the foaming agent is satisfied, the foamed granule wire is not broken when ejected from the nozzle during extrusion molding, and when the ejected foamed granule is visually checked, the size and uniformity of the foamed cell This has great advantages.

In addition, as the foaming method, foaming may be performed by including a chemical foaming agent, and physical foaming may be performed, but is not limited thereto.

The chemical blowing agent may include an azo-based chemical blowing agent, and the azo-based blowing agent may include azodicarbonamide (ADCA), azobisisobutyronitrile (AIBN), azobiscyclohexylnitrile, azodiaminobenzene, and barium azo. It may be any one selected from the group consisting of dicarboxylates and combinations thereof.

In addition, according to another aspect of the invention, a physical foaming method may also be used in which the moisture absorbent composition is extruded to form granules and then a physical foaming agent is foamed under high temperature and high pressure.

The physical foaming is a foaming method in which a liquefied gas or a supercritical fluid is dissolved in a resin under high pressure, and the solubility is reduced by lowering the pressure or heating to generate bubbles. Representative examples of the liquefied gas include Freon and hydrocarbons, preferably C ₁ -C ₅ It may be a hydrocarbon, more preferably butane and pentane, but is not limited thereto.

In the production of the hygroscopic foam of the present invention, supercritical nitrogen or supercritical carbon dioxide, which is a supercritical fluid, can be used as a foaming agent.

By adding the supercritical fluid to a mixture of the thermoplastic resin and the particulate hygroscopic material, a foamed structure is formed with the particulate hygroscopic material as the nucleus, and thus, a void can be provided around the particulate hygroscopic material. At the same time, foam cells may be formed in the foamed resin layer. Since the supercritical fluid serves as a processing aid, it is possible to mold a molded article highly filled with particulate hygroscopic material. Considering the reactivity with the particulate hygroscopic material and the size of the foam cell diameter, supercritical nitrogen is suitable. In addition, the injected amount of these supercritical fluids is calculated and determined from the calculated foaming ratio and the discharged amount of the molten resin.

Since the foamed granules satisfy a moisture absorption rate of 70% or more, preferably 100% or more, when used as a moisture absorbent, dew condensation suppression and excellent insulation effect of double-glazed glass can be satisfied.

In addition, the foamed granules can effectively suppress rust generated in parts of spacers and double-glazed glass while satisfying emission resistance of 60% or less and rusting rate of 0.1% or less, preferably 0.07% or less, and stability is also excellent for a long period of time. It has the advantage of maintaining the moisture absorption effect for a while.

Now, the method for producing the expanded granules of the present invention will be described.

According to one aspect of the present invention, a) 20 to 70 parts by weight of a hygroscopic material, 5 to 40 parts by weight of a metal oxide, 5 to 40 parts by weight of a coagulant, 5 to 70 parts by weight of a wax, 5 parts by weight of a rust inhibitor, based on 100 parts by weight of the polyolefin resin to 40 parts by weight and 0.1 to 10 parts by weight of a foaming agent to prepare a mixed composition; b) preparing expanded granules by introducing the mixed composition into an extruder and extruding; and c) cutting the foamed granules discharged from the extruder to prepare foamed granules in the form of particles.

The polyolefin resin is a resin in the form of a powder and is smooth to be uniformly mixed with the hygroscopic material, the metal oxide, the coagulant, the wax, and the rust preventive agent in a mixer.

The uniformly mixed mixed composition is introduced into an extruder and melted at the melting temperature of polyolefin, and the foaming agent is foamed at the melting temperature to produce foamed granules. The melting temperature is not limited as long as the polyolefin melts, but may be preferably 150 to 180 °C.

The expanded granules are in the form of wires coming out of the extrusion process and can be cut through a die section to produce expanded granules in the form of particles of a desired size. The average particle diameter thereof is not particularly limited, but may be 0.01 to 100 mm, preferably 0.1 to 50 mm, and more preferably 1 to 5 mm.

According to one aspect of the present invention, the foamed granules may be included in composite glass including a double glass layer filled with some or all of the edges between the glasses.

As a specific example, as shown in FIG. 2, the spacer 200 between the double-glazed windows 100 may include a moisture absorbent (foamed granules) 300, but is not limited thereto.

In the case of the composite glass including the double glass layer, there is a problem in that condensation may occur due to humidity in the space between the glass and the insulation effect is also reduced.

Accordingly, it was attempted to solve the above problem by including a moisture absorbent inside the composite glass. In particular, the moisture absorbent is mainly used by filling the inside of the spacer included in the composite glass. Since the material of the spacer is mostly aluminum, it may rapidly rust due to moisture or salt re-released from the moisture absorbent.

Therefore, by including the foamed granules prepared in the present invention in the composite glass including the double glass layer, the humidity inside the composite glass is effectively controlled, thereby suppressing the dew condensation inside the composite glass and reducing the humidity to low. It has the effect of increasing the thermal insulation effect.

In the case of the foamed granules, they have incomparably higher moisture absorption than conventionally used moisture absorbents such as zeolite and silica gel, and have excellent release resistance, so that condensation inside the composite glass can be suppressed.

In addition, the foamed granules may be used by being filled in the spacer of the composite glass, and the foamed granules have a low specific gravity and are not bent or deformed even when filled in the spacer.

According to one aspect of the present invention, the composite glass may be filled with an inert gas between glasses, and the inert gas may be any one or more gases selected from argon, nitrogen, and helium. As an inert gas is further included in the inside of the composite glass, the moisture absorption effect of the foamed granules may last for a long time.

The present invention will be described in more detail based on the following Examples and Comparative Examples. However, the following Examples and Comparative Examples are only one example for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

[melting index]

According to the ASTM D1238 measurement method, it was measured under the conditions of 125 ° C and 2.16 kg, and the melt index unit is g / 10 min.

[Stability test]

After exposure for 20 days in a constant temperature and humidity chamber at 50 ° C and 95% relative humidity, the degree of moisture generation in the PE film of the contents of the specimen was visually evaluated. At this time, with respect to the above items, if the moisture generation is at the level of water droplets on the PE film, it is marked as ◎, if moisture is generated as ○, and if excessive moisture is generated as ×.

[Moisture Absorption Test]

After exposing the specimen for 20 days at 50 ± 2 ° C and 95 ± 5% relative humidity using a thermo-hygrostat, the moisture absorption rate is measured, and the moisture absorption rate is calculated by the following formula.

[Emission rate test]

The moisture absorbent for double-glazed glass was absorbed for 48 hours at 50 ° C. and 95% relative humidity, and then released in an oven at 80 ° C. for 2 hours to measure the release rate. The release rate is calculated by the following formula.

[Formability test]

The foam cells of the foaming agent were observed with the naked eye, and when the size and uniformity of the foam cells were excellent, ◎, when the foam cells were good, ○, and when the cells were not formed or were not molded, they were marked with X.

[Routine rate test]

A 90mm × 50mm standard aluminum test piece (Q-LAB's A-23.5 product) is polished using sandpaper, etc., and then washed with ethanol and acetone. Test pieces were prepared by sealing the aluminum test piece together with the foamed granules prepared in Examples and Comparative Examples in a packaging material applied with PE breathable film of Han Chemical Co., Ltd. as an inner skin and PET of Toray Saehan Co., Ltd. (Korea) as an outer skin.

The specimens were exposed for 30 cycles at 25-55 °C and 93-95% relative humidity conditions. At this time, as shown in FIG. 3, 1 cycle is exposed at 25 ° C. and 98% relative humidity conditions for the initial 2 hours, and after raising the temperature to 55 ° C. for 1 hour and 30 minutes, 4 cycles at 55 ° C. and 95% relative humidity conditions. After exposure for 30 minutes, the temperature was lowered to 25°C for 30 minutes, and exposure was performed at 25°C and 95% relative humidity for 1 hour and 30 minutes.

[Example 1]

As shown in Table 1, 43.48 parts by weight of magnesium chloride, magnesium oxide (KONOSHIMA CHEMICAL, STARMAG 50) 10.87 parts by weight, sodium carboxymethyl cellulose (Assay: 6.5-9.5% sodium, Mw 500 g/mol) 10.87 parts by weight, sodium benzoate 21.74 parts by weight, polyethylene wax 21.74 parts by weight, magnesium stearate 6.52 parts by weight and azo A mixed composition was prepared by mixing 2.17 parts by weight of dicarbonamide with a mixer.

The mixed composition was put into an extruder and extruded to prepare expanded granules.

The prepared expanded granules were measured for moisture absorption rate, rusting rate, release rate, moldability and stability, and are listed in Table 2.

[Example 2]

Example 1 was carried out in the same manner, except that the content of the mixed composition was used as described in Table 2. The prepared foamed granules were measured for moisture absorption, rusting rate, release rate and stability, and are listed in Table 2.

[Example 3]

Example 1 was carried out in the same manner, except that magnesium stearate was not used and the content of the mixed composition was used as described in Table 2. The prepared expanded granules were measured for moisture absorption rate, rusting rate, release rate, moldability and stability, and are listed in Table 2.

[Example 4]

Example 1 was carried out in the same manner, except that magnesium oxide was not used and the content of the mixed composition was used as described in Table 2. The prepared foamed granules were measured for moisture absorption, rusting rate, release rate and stability, and are listed in Table 2.

[Comparative Example 1]

Example 1 was carried out in the same manner, except that sodium carboxymethyl cellulose was not used and the content of the mixed composition was used as described in Table 2. The prepared expanded granules were measured for moisture absorption rate, rusting rate, release rate, moldability and stability, and are listed in Table 2.

[Comparative Example 2]

Example 1 was carried out in the same manner, except that sodium benzoate was not used and the content of the mixed composition was used as described in Table 2. The prepared expanded granules were measured for moisture absorption rate, rusting rate, release rate, moldability and stability, and are listed in Table 2.

[Comparative Example 3]

Example 1 was carried out in the same manner, except that azodicarbonamide was not used and the content of the mixed composition was used as described in Table 2. The prepared foamed granules were measured for moisture absorption, rusting rate, release rate and stability, and are listed in Table 2.

[Comparative Example 4]

Example 1 was carried out in the same manner, except that azodicarbonamide and sodium benzoate were not used, and the content of the mixed composition was used as described in Table 2. The prepared expanded granules were measured for moisture absorption rate, rusting rate, release rate, moldability and stability, and are listed in Table 2.

[Comparative Example 5]

Example 1 was carried out in the same manner, except that magnesium stearate, azodicarbonamide and sodium benzoate were not used, and the content of the mixed composition was used as shown in Table 2. The prepared expanded granules were measured for moisture absorption rate, rusting rate, release rate, moldability and stability, and are listed in Table 2.

[Comparative Example 6]

Zeolite (3 Å, GEOMOLS_PG10, Cosmo Advanced Materials Co.) was used instead of the expanded granules of Example 1, and its moisture absorption, rust formation, release rate, formability and stability were measured and listed in Table 2.

low density polyethylene hygroscopic material metal oxide polymer coagulant rust inhibitor blowing agent
(baking soda) wax metal stearate Example 1 100 43.48 10.87 10.87 21.74 2.17 21.74 6.52 Example 2 100 36.70 9.17 5.50 9.17 2.75 9.17 11.01 Example 3 100 24.79 8.26 4.96 16.53 2.48 8.26 - Example 4 100 43.48 - 10.87 21.74 2.75 21.74 6.52 Comparative Example 1 100 43.48 10.87 - 21.74 2.17 21.74 6.52 Comparative Example 2 100 43.48 10.87 10.87 - 2.17 21.74 6.52 Comparative Example 3 100 43.48 10.87 10.87 21.74 - 21.74 6.52 Comparative Example 4 100 29.31 10.34 6.90 - - 17.24 8.62 Comparative Example 5 100 20.83 8.33 5.56 - 4.17 - -

Moisture absorption rate (%) Rusting rate (%) Emission rate (%) stability formability Example 1 104 0.04 58.65 ◎ ◎ Example 2 90 0.08 55.32 ◎ ◎ Example 3 75 0.04 43.25 ○ ○ Example 4 80 0.10 60.87 ○ ○ Comparative Example 1 96 0.05 54.31 × ○ Comparative Example 2 106 53.69 58.91 × ○ Comparative Example 3 86 0.06 50.21 × ○ Comparative Example 4 75 53.69 43.59 × ○ Comparative Example 5 73 53.69 41.54 × × Comparative Example 6 20 0.19 62.31 - -

As described above, the present invention has been described by specific details and limited embodiments and drawings, but this is only provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments, and the present invention Those skilled in the art can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it will be said that not only the claims to be described later, but also all modifications equivalent or equivalent to these claims belong to the scope of the present invention. .

100: double glazing
200: spacer
300: desiccant or foam granule

Claims (10)

Based on 100 parts by weight of polyolefin resin, 20 to 70 parts by weight of hygroscopic material, 5 to 40 parts by weight of metal oxide, 5 to 40 parts by weight of coagulant, 5 to 70 parts by weight of wax, 1 to 40 parts by weight of rust inhibitor, and 0.1 to 10 parts by weight of foaming agent Including parts by weight,
The hygroscopic material includes at least one selected from the group consisting of magnesium chloride, calcium chloride, sodium carbonate, sodium phosphate, sodium hydrogen carbonate, sodium citrate, sodium oxalate and sodium sulfate,
The expanded granules, wherein the metal oxide is at least one selected from the group consisting of magnesium oxide and calcium oxide. delete delete According to claim 1,
The foamed granules comprising at least one rust preventive agent selected from alkali metal-based benzoate and triazole-based compounds. According to claim 1,
The wax is one or two or more selected from polyethylene wax, polypropylene wax, polyamide wax, carnova wax, polytetrafluoroethylene wax, and polyolefin wax. According to claim 1,
The coagulant is cross-linked polyacrylic salt, non-crosslinked polyacrylic salt, cellulose, superabsorbent cellulose resin, guar gum, xanthan gum, gum arabic, ghatti gum, rogerst bean gum, damma gum, gellan gum, rosin gum, karaya gum, ko Effervescent granules comprising at least one selected from the group consisting of palgum, tara gum, tamarind gum and tragacanth gum. According to claim 1,
The foaming agent is an azo-based chemical foaming agent. According to claim 1,
The expanded granules further contain metal stearate. A composite glass comprising a double glass layer in which part or all of an edge between glass is filled with the foamed granules of any one of claims 1 and 4 to 8. According to claim 9,
The composite glass is a composite glass in which an inert gas is filled between glasses.

Images