Rock wool inorganic adhesive and application thereof in rock wool products

Abstract

The invention belongs to the technical field of building thermal insulation materials and inorganic adhesives, discloses a rock wool inorganic adhesive and application thereof in rock wool products, and aims to solve the problems of poor environmental protection property, insufficient bonding strength, weak water resistance, low storage stability and low industrial solid waste utilization rate of a traditional rock wool adhesive. The adhesive is prepared from the following components in parts by weight: 30 parts of sodium hyaluronate (modulus of 2.2-2.4), 35 parts of S95-grade slag powder, 1 part of NaOH, 0.5 part of bentonite, 0.3 part of a KH-550 silane coupling agent, 0.1 part of sodium benzoate and 45 parts of water. The preparation method comprises the steps of raw material pretreatment, step-by-step dry mixing, admixture doping, pulping stirring and sealed storage. During application, a rock wool product is obtained through dilution (the ratio of an adhesive to water is 1: 2.8), roughening of a rock wool base material, coating (220-280 g / m), curing (curing for 2-4 days at the temperature of 20-30 DEG C and the relative humidity of more than or equal to 60%) and post-processing. Industrial solid waste is utilized, no formaldehyde / VOCs are released, the bonding strength is improved by 15% or above compared with that of a traditional inorganic adhesive, the strength retention rate is larger than or equal to 85% after 7-day water soaking, the storage period of the adhesive is larger than or equal to 6 months, and the adhesive has environment friendliness, high performance and economical efficiency and is suitable for large-scale production and application of rock wool heat preservation products in the fields of buildings and industry.

Description

Technical Field

[0001] This invention belongs to the technical field of building insulation materials and inorganic adhesives, specifically relating to an environmentally friendly and efficient inorganic rock wool adhesive with sodium hyaluronate as its core, and its application method in rock wool products. Background Technology

[0002] Rock wool is widely used as a thermal insulation material in the construction and industrial fields, and its performance is highly dependent on the quality of the adhesive. Traditional organic adhesives have drawbacks such as formaldehyde release and poor high-temperature resistance; existing inorganic adhesives (such as cement-based adhesives) suffer from insufficient bonding strength, poor water resistance, and weak interfacial compatibility with rock wool. Meanwhile, the demand for resource utilization of industrial solid waste (such as slag) is also prompting the industry to explore new environmentally friendly adhesive systems. Therefore, developing an environmentally friendly, non-toxic, high-strength, water- and weather-resistant inorganic rock wool adhesive that also utilizes industrial waste is of significant practical importance. Summary of the Invention

[0003] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an inorganic rock wool adhesive that uses sodium hyaluronate as the main binder and synergistically reacts with the hydration reaction of slag powder. This achieves synergistic optimization of environmental friendliness, bonding strength, water resistance, and storage stability, and clarifies its application method in rock wool products.

[0004] Technical solution An inorganic rock wool adhesive and its application in rock wool products, wherein the formulation of the inorganic rock wool adhesive is as follows (by weight): 1. Sodium hyaluronate (modulus 2.2-2.4): 30 parts by weight, as the core inorganic binder, provides initial adhesion, and its modulus determines the bond strength and water resistance; 2. S95 grade slag powder: 35 parts by weight, realizing the resource utilization of industrial solid waste, reacting with alkaline components to generate hydration products, enhancing the strength and water resistance of adhesives; 3. NaOH: 1 part by weight, to adjust the alkalinity of the system and activate the potential hydration activity of S95 slag powder; 4. Bentonite: 0.5 parts by weight, improves the thixotropy and coatability of adhesives, and prevents stratification and settling; 5. KH-550 silane coupling agent: 0.3 parts by weight, enhances the interfacial adhesion between the adhesive and rock wool fiber, and improves the overall mechanical properties; 6. Sodium benzoate: 0.1 parts by weight, inhibits microbial growth and extends the shelf life of adhesives; 7. Water: 45 parts by weight, used as a dispersion medium to form a homogeneous slurry.

[0005] An inorganic rock wool adhesive and its application in rock wool products, wherein the preparation method of the inorganic rock wool adhesive is as follows: 1. Raw material pretreatment: S95 grade slag powder is passed through a 325-mesh sieve to ensure uniform powder fineness; 2. Step-by-step mixing: First, add sodium hyaluronate, S95 grade slag powder, and bentonite to the mixer and dry mix for 3-5 minutes; 3. Additive addition: Add NaOH, KH-550 coupling agent, and sodium benzoate, and continue dry mixing for 2-3 minutes; 4. Pulping and mixing: Add the amount of water specified in the formula and stir at a speed of 500-800 r / min for 10-15 minutes to form a uniform, lump-free adhesive slurry; 5. Storage: Seal and store the prepared adhesive slurry in a cool, dry place, away from direct sunlight.

[0006] An inorganic adhesive for rock wool and its application in rock wool products, wherein the method for application in rock wool products is as follows: 1. Adhesive dilution: Before application, dilute with water at a weight ratio of 1:2.8 and stir until there is no sediment. 2. Rock wool substrate pretreatment: Clean impurities from the surface of the rock wool board (or rock wool strips) and use mechanical roughening treatment to enhance interfacial adhesion; 3. Adhesive coating: Apply the diluted adhesive evenly to the bonding surface of the rock wool substrate using roller coating, spraying or scraping methods, with the coating amount controlled at 220-280g / m². 4. Composite and curing: If preparing composite rock wool boards, alkali-resistant mesh cloth or inorganic boards (such as calcium silicate boards) can be laminated after coating, and then placed in an environment with a temperature of 20-30℃ and a relative humidity of ≥60% for 2-4 days to allow the adhesive to fully cure. 5. Post-processing: Cut and shape according to requirements to obtain final products such as rock wool insulation boards and rock wool composite boards.

[0007] Beneficial effects 1. Environmental protection and resource utilization: Utilizing S95 grade slag powder (industrial solid waste) and all inorganic components, with no formaldehyde or VOCs release, it meets the requirements of green building and circular economy development. 2. Excellent bonding strength: The synergistic effect of the adhesive properties of sodium hyaluronate and the strength of the hydration products of slag powder, combined with the interfacial enhancement effect of KH-550 coupling agent, increases the bonding strength between rock wool and adhesive by more than 15% compared with traditional inorganic adhesives. 3. Strong water and weather resistance: High-modulus sodium hyaluronate and slag hydration products have excellent water resistance, ensuring the long-term stable performance of rock wool products in humid and outdoor environments; 4. Excellent storage and workability: The anti-corrosion properties of sodium benzoate extend the shelf life of the adhesive to more than 6 months. After dilution, it has good coatability and is suitable for industrial continuous production and on-site construction scenarios. 5. Significant cost advantages: Raw materials are widely available (sodium hyaluronate and slag powder are inexpensive), the preparation process is simple, and it has the economic feasibility for large-scale promotion. Detailed Implementation

[0008] An inorganic rock wool adhesive and its application in rock wool products, wherein the formulation of the inorganic rock wool adhesive is as follows (by weight): 1. Sodium hyaluronate (modulus 2.2-2.4): 30 parts by weight, as the core inorganic binder, provides initial adhesion, and its modulus determines the bond strength and water resistance; 2. S95 grade slag powder: 35 parts by weight, realizing the resource utilization of industrial solid waste, reacting with alkaline components to generate hydration products, enhancing the strength and water resistance of adhesives; 3. NaOH: 1 part by weight, to adjust the alkalinity of the system and activate the potential hydration activity of S95 slag powder; 4. Bentonite: 0.5 parts by weight, improves the thixotropy and coatability of adhesives, and prevents stratification and settling; 5. KH-550 silane coupling agent: 0.3 parts by weight, enhances the interfacial adhesion between the adhesive and rock wool fiber, and improves the overall mechanical properties; 6. Sodium benzoate: 0.1 parts by weight, inhibits microbial growth and extends the shelf life of adhesives; 7. Water: 45 parts by weight, used as a dispersion medium to form a homogeneous slurry.

[0009] An inorganic rock wool adhesive and its application in rock wool products, wherein the preparation method of the inorganic rock wool adhesive is as follows: 1. Raw material pretreatment: S95 grade slag powder is passed through a 325-mesh sieve to ensure uniform powder fineness; 2. Step-by-step mixing: First, add sodium hyaluronate, S95 grade slag powder, and bentonite to the mixer and dry mix for 3-5 minutes; 3. Additive addition: Add NaOH, KH-550 coupling agent, and sodium benzoate, and continue dry mixing for 2-3 minutes; 4. Pulping and mixing: Add the amount of water specified in the formula and stir at a speed of 500-800 r / min for 10-15 minutes to form a uniform, lump-free adhesive slurry; 5. Storage: Seal and store the prepared adhesive slurry in a cool, dry place, away from direct sunlight.

[0010] An inorganic adhesive for rock wool and its application in rock wool products, wherein the method for application in rock wool products is as follows: 1. Adhesive dilution: Before application, dilute with water at a weight ratio of 1:2.8 and stir until there is no sediment. 2. Rock wool substrate pretreatment: Clean impurities from the surface of the rock wool board (or rock wool strips) and use mechanical roughening treatment to enhance interfacial adhesion; 3. Adhesive coating: Apply the diluted adhesive evenly to the bonding surface of the rock wool substrate using roller coating, spraying or scraping methods, with the coating amount controlled at 220-280g / m². 4. Composite and curing: If preparing composite rock wool boards, alkali-resistant mesh cloth or inorganic boards (such as calcium silicate boards) can be laminated after coating, and then placed in an environment with a temperature of 20-30℃ and a relative humidity of ≥60% for 2-4 days to allow the adhesive to fully cure. 5. Post-processing: Cut and shape according to requirements to obtain final products such as rock wool insulation boards and rock wool composite boards. Example

[0011] Adhesive preparation - Raw material ratio: 30 parts sodium hyaluronate (modulus 2.3), 35 parts S95 grade slag powder, 1 part NaOH, 0.5 parts bentonite, 0.3 parts KH-550 coupling agent, 0.1 parts sodium benzoate, and 45 parts water; - Preparation steps: Dry mix powder for 5 minutes → Add additives and dry mix for 3 minutes → Add water and stir at 600 r / min for 12 minutes → Seal and store.

[0012] Rock wool product applications - Adhesive dilution: Take 100kg of adhesive and add 280kg of water, then stir until well mixed; - Rock wool substrate: Rock wool board with a density of 140kg / m³ is selected, and the surface is mechanically roughened; - Coating and curing: Roller-coating the diluted adhesive (coating amount 250g / m²) and curing for 3 days at room temperature (25℃) and relative humidity 65%; - Performance test: The bonding strength between rock wool and adhesive reaches 0.22MPa (far exceeding the national standard requirement of ≥0.10MPa), the strength retention rate is 88% after immersion in water for 7 days, and there is no significant performance degradation within the storage period of 6 months.

[0013] This invention solves the pain points of traditional rock wool adhesives in terms of environmental protection, bonding strength, water resistance and storage stability by using an innovative sodium hyaluronate-slag powder synergistic system and optimizing coupling agents and functional additives. It provides a new technical path for the high-performance and green application of rock wool products.

Claims

1. An inorganic rock wool adhesive and its application in rock wool products, wherein the inorganic rock wool adhesive is characterized in that, By weight, it consists of the following components: 30 parts by weight of sodium hyaluronate (modulus 2.2-2.4); 35 parts by weight of S95 grade slag powder; 1 part by weight of NaOH; 0.5 parts by weight of bentonite; KH-550 silane coupling agent 0.3 parts by weight; Sodium benzoate 0.1 parts by weight; 45 parts by weight of water.

2. The rock wool inorganic adhesive according to claim 1, characterized in that, The modulus of the sodium hyaluronate is 2.25-2.

35.

3. The rock wool inorganic adhesive according to claim 1, characterized in that, The S95 grade slag powder needs to be screened through a 325-mesh sieve to ensure uniform powder fineness.

4. The rock wool inorganic adhesive according to claim 1, characterized in that, The adhesive slurry should be stored in a sealed container in a cool, dry place, away from direct sunlight.

5. A method for preparing the rock wool inorganic adhesive according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Raw material pretreatment, passing S95 grade slag powder through a 325 mesh sieve; S2: Mix in steps. Add sodium hyaluronate, S95 grade slag powder, and bentonite to the mixer and dry mix for 3-5 minutes. S3: Additives are incorporated by adding NaOH, KH-550 silane coupling agent, and sodium benzoate, and continuing to dry mix for 2-3 minutes; S4: Pulping and mixing: Add 45 parts by weight of water and stir at a speed of 500-800 r / min for 10-15 minutes to form a uniform, lump-free adhesive slurry; S5: Storage, the adhesive slurry is sealed and stored under the conditions described in claim 4.

6. The preparation method according to claim 5, characterized in that, The dry mixing time in step S2 is 4-5 minutes, and the dry mixing time in step S3 is 2.5-3 minutes.

7. The preparation method according to claim 5, characterized in that, In step S4, the stirring speed is 600-700 r / min.

8. The preparation method according to claim 5, characterized in that, The stirring time in step S4 is 12-14 minutes.

9. A method for applying the rock wool inorganic adhesive according to any one of claims 1-4 in rock wool products, characterized in that, Includes the following steps: T1: Adhesive dilution. Dilute the adhesive according to the weight ratio of adhesive to water = 1:2.8, and stir until there is no sediment. T2: Rock wool substrate pretreatment, cleaning impurities from the surface of rock wool boards or rock wool strips, and mechanical roughening treatment; T3: Adhesive coating, using roller coating, spraying or scraping methods, the diluted adhesive is evenly applied to the bonding surface of the rock wool substrate, with a coating amount of 220-280g / m². T4: Composite and curing. If preparing composite rock wool boards, after coating, composite alkali-resistant mesh cloth or inorganic board material is applied, and then placed in an environment with a temperature of 20-30℃ and a relative humidity of ≥60% for 2-4 days for curing. T5: Post-processing, cutting and shaping the cured rock wool substrate according to requirements to obtain rock wool products.

10. A rock wool inorganic adhesive according to claim 1 and its application in rock wool products, wherein the rock wool product is characterized in that, The rock wool product has a bonding strength between the rock wool and the adhesive ≥ 0.22 MPa, and a strength retention rate ≥ 88% after immersion in water for 7 days.