Weather-resistant formaldehyde-free rock wool and preparation method thereof

Abstract

The invention relates to the technical field of rock wool preparation, and provides weather-resistant formaldehyde-free rock wool and a preparation method thereof.The weather-resistant formaldehyde-free rock wool is prepared from, by weight, 60-70 parts of basalt, 30-40 parts of dolomite, 10-15 parts of slag, 20-30 parts of coke, 5-10 parts of kieselguhr and 6-8 parts of binder; the binder comprises a water-based hot-sealing adhesive and a starch adhesive; the mass ratio of the water-based hot-sealing adhesive to the starch adhesive is (1: 10)-(10: 1). By means of the technical scheme, the problems that rock wool is low in weather resistance and contains formaldehyde in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rock wool preparation, and in particular to weather-resistant formaldehyde-free rock wool and a preparation method thereof. Background Art

[0002] Rock wool is a man-made inorganic fiber made from natural minerals such as basalt as the main raw materials, which is melted at high temperature and then made by high-speed centrifugal equipment. Rock wool has a wide range of applications. In the construction field, it can be used for exterior wall insulation, roof insulation, etc., which can effectively reduce the energy consumption of buildings; in the industrial field, it can be used for thermal insulation of various pipes, storage tanks, and equipment to reduce energy loss. However, traditional rock wool generally contains formaldehyde, which can have serious effects on human health, such as irritating the respiratory tract and causing allergies. Secondly, during long-term use, rock wool is easily affected by external environmental factors such as temperature, humidity, and ultraviolet rays, which can reduce its performance and shorten its service life. For example, in outdoor environments, non-weather-resistant rock wool may crack, powder, etc., thereby reducing its thermal insulation effect. Therefore, the development of a highly weather-resistant formaldehyde-free rock wool is an urgent problem that needs to be solved. Summary of the Invention

[0003] The present invention provides a weather-resistant formaldehyde-free rock wool and a preparation method thereof, which solves the problems of low weather resistance and formaldehyde content of rock wool in related technologies.

[0004] The technical solution of the present invention is as follows: The present invention provides a weather-resistant formaldehyde-free rock wool, comprising the following raw materials in parts by weight: 60-70 parts of basalt, 30-40 parts of dolomite, 10-15 parts of slag, 20-30 parts of coke, 5-10 parts of diatomaceous earth, and 6-8 parts of a binder; The adhesive comprises water-based heat-sealing adhesive and starch adhesive; the mass ratio of the water-based heat-sealing adhesive to the starch adhesive is 1:10 to 10:1.

[0005] In the present invention, the water-based heat seal adhesive is a water-based hot melt adhesive primarily composed of a polymer emulsion, additives, stabilizers, and fillers. It is suitable for bonding various heat-sealable materials, such as paper, plastic film, and metal foil, and is widely used in the packaging, printing, shoemaking, and furniture industries. Examples of water-based heat seal adhesives include one or more of water-based polyurethane heat seal adhesives, water-based acrylic heat seal adhesives, and water-based polyester heat seal adhesives.

[0006] As a further technical solution, the mass ratio of the water-based heat-sealing adhesive to the starch adhesive is 9-10:1.

[0007] As a further technical solution, the starch glue is modified starch glue, and the raw materials of the modified starch glue include a modifier and starch in a mass ratio of 2 to 3:10, and the modifier includes a siloxane compound.

[0008] In the present invention, silanol compounds are used to modify starch, thereby enhancing the hydrophobicity of starch glue, improving the bonding strength between starch glue and basalt and diatomaceous earth, and improving the weather resistance of rock wool.

[0009] As a further technical solution, the siloxane compound includes one or more of (triethoxysilyl)methanol, 1,1,3,3-tetramethyl-1,3-disiloxanediol, and trimethylsiloxyvinyldimethylmethanol.

[0010] As a further technical solution, the preparation method of the modified starch glue comprises the following steps: mixing starch with water, gelatinizing the mixture, adding a modifier and mixing the mixture evenly to obtain the modified starch glue.

[0011] As a further technical solution, the modifier further includes a phenolic compound, and the mass ratio of the phenolic compound to the siloxane compound is 1-2:2.

[0012] In the present invention, the starch is modified simultaneously with the siloxane compound and the phenolic compound, thereby strengthening the cross-linking strength between starch glue molecules, reducing the gaps between starch glue molecules, reducing the penetration of water molecules, and improving the weather resistance of rock wool.

[0013] As a further technical solution, the phenolic compound is a tannin, and the tannin includes one or both of hydrolyzed tannin and condensed tannin.

[0014] As a further technical solution, when the tannins include hydrolyzed tannins, the hydrolyzed tannins include one or both of gallic acid and gallic tannic acid; when the tannins include condensed tannins, the condensed tannins include one or both of catechins and proanthocyanidins.

[0015] As a further technical solution, the tannins are hydrolyzed tannins.

[0016] In the present invention, hydrolyzed tannin is used as a modifier, and the hydrolysis product of the hydrolyzed tannin can form a new hydrophobic structure, which reacts with free radicals to provide antioxidant protection for the rock wool, thereby improving the weather resistance of the rock wool.

[0017] The present invention also provides a method for preparing weather-resistant formaldehyde-free rock wool, comprising the following steps: S1. Weigh basalt, dolomite, slag, coke, and diatomaceous earth, grind and mix them, and melt them to obtain a melt; S2. Centrifugally forming the melt into fibers to obtain rock wool fibers, spraying a binder during the centrifugal fiber forming process, and obtaining weather-resistant formaldehyde-free rock wool after aggregation and curing.

[0018] As a further technical solution, the melting temperature is 1500-1600°C.

[0019] The working principle and beneficial effects of the present invention are: In the present invention, basalt, dolomite, slag, coke, and diatomaceous earth are used as raw materials, and water-based heat-sealing adhesive and starch adhesive are added as binders. By adjusting the mass ratio of the two binders, the synergistic effect of the two binders is exerted, the bonding strength and filling properties of the binders are enhanced, and the weather resistance of the rock wool is improved. At the same time, both binders do not contain formaldehyde components. The prepared rock wool is tested for formaldehyde emission as specified in GB / T 32379-2015 "Determination of Formaldehyde Emission of Mineral Wool and Its Products". The results show that no formaldehyde components are detected in the samples, thus meeting environmental protection requirements. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] In the following examples and comparative examples: Water-based heat sealant: Model LC704, manufacturer: Nanjing Qinghai Trading Co., Ltd. Corn starch: content 99wt%; Catechin: content is 98wt%; Gallic acid: content is 99wt%; Gallnut tannic acid: content 95wt%; Rock wool fiber: average diameter 5μm.

[0022] Example 1 The preparation of starch glue includes the following steps: weighing 10 parts of corn starch, adding 30 parts of water, heating to 70°C to start gelatinization, keeping warm for 20 minutes, cooling to 50°C, adding 30 parts of water, stirring for 10 minutes, and cooling to room temperature to obtain starch glue.

[0023] A method for preparing weather-resistant formaldehyde-free rock wool comprises the following steps: S1. Weigh 60 parts of basalt, 30 parts of dolomite, 10 parts of slag, 20 parts of coke, and 5 parts of diatomaceous earth, crush and mix them, and melt them at a high temperature of 1500°C to obtain a melt; S2. The molten mass flows out from the siphon port of the cupola and is spun into rock wool fibers under the high-speed centrifugal action of a four-roll centrifuge. During the centrifugal process, 6 parts of a binder are sprayed on the fibers. After being collected and cured, weather-resistant formaldehyde-free rock wool is obtained. The binder is composed of a water-based heat-sealing adhesive and starch glue in a mass ratio of 1:10.

[0024] Example 2 The preparation of starch glue includes the following steps: weighing 10 parts of corn starch, adding 30 parts of water, heating to 70°C to start gelatinization, keeping warm for 20 minutes, cooling to 50°C, adding 30 parts of water, stirring for 10 minutes, and cooling to room temperature to obtain starch glue.

[0025] A method for preparing weather-resistant formaldehyde-free rock wool comprises the following steps: S1. Weigh 65 parts of basalt, 35 parts of dolomite, 12 parts of slag, 25 parts of coke, and 8 parts of diatomaceous earth, grind and mix them, and melt them at a high temperature of 1550°C to obtain a melt; S2. The molten mass flows out from the siphon port of the cupola and is spun into rock wool fibers under the high-speed centrifugal action of a four-roll centrifuge. During the centrifugal process, 7 parts of a binder are sprayed on the fibers. After being collected and cured, weather-resistant formaldehyde-free rock wool is obtained. The binder is composed of a water-based heat-sealing adhesive and starch glue in a mass ratio of 9:1.

[0026] Example 3 The preparation of starch glue includes the following steps: weighing 10 parts of corn starch, adding 30 parts of water, heating to 70°C to start gelatinization, keeping warm for 20 minutes, cooling to 50°C, adding 30 parts of water, stirring for 10 minutes, and cooling to room temperature to obtain starch glue.

[0027] A method for preparing weather-resistant formaldehyde-free rock wool comprises the following steps: S1. Weigh 70 parts of basalt, 40 parts of dolomite, 15 parts of slag, 30 parts of coke, and 10 parts of diatomaceous earth, grind and mix them, and melt them at a high temperature of 1600°C to obtain a melt; S2. The molten mass flows out from the siphon port of the cupola and is spun into rock wool fibers under the high-speed centrifugal action of a four-roll centrifuge. During the centrifugal process, 8 parts of a binder are sprayed on the fibers. After being collected and cured, weather-resistant formaldehyde-free rock wool is obtained. The binder is composed of a water-based heat-sealing adhesive and starch glue in a mass ratio of 9:1.

[0028] Example 4 Compared with Example 1, the difference of Example 4 is that the adhesive consists of water-based heat-sealing adhesive and starch adhesive in a mass ratio of 10:1.

[0029] Example 5 The preparation of modified starch glue includes the following steps: weighing 10 parts of corn starch, adding 30 parts of water, heating to 70°C to start gelatinization, keeping warm for 20 minutes, cooling to 50°C, adding 2 parts of modifier, stirring for 60 minutes, adding 30 parts of water, stirring for 10 minutes, and cooling to room temperature to obtain starch glue; the modifier is (triethoxysilyl) methanol.

[0030] Compared with Example 4, the difference of Example 5 is that the starch glue is replaced by an equal amount of modified starch glue obtained by the above preparation method.

[0031] Example 6 Compared with Example 5, the difference in Example 6 is that the amount of the modifier added is 3 parts.

[0032] Example 7 Compared with Example 6, Example 7 is different in that (triethoxysilyl)methanol is replaced with an equal amount of trimethylsilyloxyvinyldimethylmethanol.

[0033] Example 8 Compared with Example 7, the difference in Example 8 is that the modifier consists of gallic acid and trimethylsiloxyvinyl dimethylcarbinol in a mass ratio of 1:2.

[0034] Example 9 Compared with Example 8, the difference of Example 9 is that the modifier consists of gallic acid and trimethylsiloxyvinyl dimethyl carbinol in a mass ratio of 2:2.

[0035] Example 10 Compared with Example 9, Example 10 is different in that gallic acid is replaced by an equal amount of gallic tannic acid.

[0036] Example 11 Compared with Example 9, Example 11 is different in that gallic acid is replaced by an equal amount of catechin.

[0037] Example 12 Compared with Example 9, Example 12 is different in that trimethylsilyloxyvinyldimethylcarbinol is replaced with an equal amount of gallic acid.

[0038] Comparative Example 1 Compared with Example 1, the difference in Comparative Example 1 is that the adhesive is a water-based heat-sealing adhesive.

[0039] Comparative Example 2 Compared with Example 1, the difference of Comparative Example 2 is that the binder is starch glue.

[0040] The weather-resistant formaldehyde-free rock wool prepared in Examples 1 to 12 and Comparative Examples 1 to 2 was tested according to the following method: 1. Formaldehyde emission: Test the formaldehyde emission of the sample in accordance with the test method specified in GB / T 32379-2015 "Determination of formaldehyde emission of mineral wool and its products".

[0041] 2. Hydrophobicity: Test the hydrophobicity of the sample according to the test method specified in GB / T 10299-2011 "Test method for hydrophobicity of insulating materials".

[0042] 3. Point load: Test the point load of the sample according to the test method specified in GB / T 19686-2015 "Rockwool Insulation Products for Building".

[0043] The test results are shown in the following table: Table 1 Performance test results of weather-resistant formaldehyde-free rock wool prepared in Examples 1 to 12 and Comparative Examples 1 to 2

[0044] From the formaldehyde emission test results of the weather-resistant formaldehyde-free rock wool prepared in Examples 1 to 12 and Comparative Examples 1 to 2, it can be seen that no formaldehyde component was detected in the samples, which meets the environmental protection requirements.

[0045] Compared with Example 1, Comparative Example 1 only added water-based heat-sealing glue as a binder, and Comparative Example 2 only added starch glue as a binder. As a result, the hydrophobicity and point load of Example 1 were higher than those of Comparative Examples 1 and 2, indicating that the water-based heat-sealing glue and starch glue exerted a synergistic effect to enhance the weather resistance of rock wool.

[0046] Compared with Example 4, Examples 5 to 7 added modified starch glue modified with a siloxane compound. As a result, the hydrophobicity and point load of Examples 5 to 7 were higher than those of Example 4, indicating that the addition of modified starch glue can improve the weather resistance of rock wool.

[0047] Compared with Examples 7 and 12, Examples 8 to 11 added modified starch glue obtained by simultaneously modifying a siloxane compound and a phenolic compound. As a result, the hydrophobicity and point load of Examples 8 to 11 were higher than those of Examples 7 and 12, indicating that the siloxane compound and the phenolic compound exerted a synergistic effect and could improve the weather resistance of rock wool.

[0048] Compared with Example 9, Example 11 replaces the hydrolyzed tannin gallic acid with an equal amount of condensed tannin catechin to modify the starch glue. As a result, the hydrophobicity and point load of Example 9 are higher than those of Example 11, indicating that when the phenolic compound is hydrolyzed tannin, the obtained rock wool has better weather resistance.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A weather-resistant formaldehyde-free rock wool, characterized in that: The invention comprises the following raw materials in parts by weight: 60-70 parts of basalt, 30-40 parts of dolomite, 10-15 parts of slag, 20-30 parts of coke, 5-10 parts of diatomaceous earth and 6-8 parts of adhesive; the adhesive comprises water-based heat-sealing adhesive and starch adhesive; the mass ratio of the water-based heat-sealing adhesive to the starch adhesive is 1:10-10:

1.

2. The weather-resistant formaldehyde-free rock wool according to claim 1, characterized in that: The mass ratio of the aqueous heat-sealing adhesive to the starch adhesive is 9-10:

1.

3. The weather-resistant formaldehyde-free rock wool according to claim 1, characterized in that: The starch glue is modified starch glue, and the raw materials of the modified starch glue include a modifier and starch in a mass ratio of 2 to 3:10, and the modifier includes a siloxane compound.

4. The weather-resistant formaldehyde-free rock wool according to claim 3, characterized in that: The siloxane compound includes one or more of (triethoxysilyl)methanol, 1,1,3,3-tetramethyl-1,3-disiloxanediol, and trimethylsiloxyvinyldimethylmethanol.

5. The weather-resistant formaldehyde-free rock wool according to claim 3, characterized in that: The preparation method of the modified starch glue comprises the following steps: starch and water are mixed, gelatinized, and a modifier is added and mixed uniformly to obtain the modified starch glue.

6. The weather-resistant formaldehyde-free rock wool according to claim 3, characterized in that: The modifier further comprises a phenolic compound, and the mass ratio of the phenolic compound to the siloxane compound is 1-2:

2.

7. The weather-resistant formaldehyde-free rock wool according to claim 6, characterized in that: The phenolic compounds are tannins, and the tannins include one or both of hydrolyzed tannins and condensed tannins.

8. The weather-resistant formaldehyde-free rock wool according to claim 7, characterized in that: When the tannins include hydrolyzed tannins, the hydrolyzed tannins include one or two of gallic acid and gallic tannic acid; when the tannins include condensed tannins, the condensed tannins include one or two of catechins and proanthocyanidins.

9. A method for preparing weather-resistant formaldehyde-free rock wool according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Weigh basalt, dolomite, slag, coke and diatomaceous earth, crush and mix them, and melt them to obtain a molten body; S2, centrifugally forming the melt into fibers to obtain rock wool fibers, spraying a binder during the centrifugal fiber forming process, and obtaining weather-resistant formaldehyde-free rock wool after being assembled and cured.

10. The method for preparing weather-resistant formaldehyde-free rock wool according to claim 9, characterized in that: The melting temperature is 1500-1600°C.

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