Rock wool inorganic adhesive and rock wool product preparation method thereof

Abstract

The invention discloses a rock wool inorganic adhesive and a rock wool product preparation method thereof, and belongs to the technical field of building thermal insulation materials and inorganic adhesives. The rock wool inorganic adhesive comprises the following components in parts by weight: 30-50 parts of phosphoaluminate cement, 15-25 parts of metakaolin, 5-10 parts of a composite inorganic gel system composed of nano silicon dioxide, 1-3 parts of a polycarboxylic acid water reducer, 2-5 parts of an organic silicon water repellent, 3-8 parts of a functional additive composed of chopped glass fibers, and 20-30 parts of water. The preparation method comprises the steps of dry mixing dispersion, admixture doping and pulping. The preparation method of the rock wool product comprises the steps of rock wool board pretreatment, adhesive coating, optional composite reinforcement, curing maintenance and post-treatment. The adhesive disclosed by the invention is environment-friendly, non-toxic, free of release of harmful substances, excellent in water resistance and weather resistance, simple in preparation process, short in curing time and suitable for industrial large-scale production, the bonding strength is improved by 20% or above compared with that of a traditional product, and a prepared rock wool product is good in comprehensive performance and can meet application requirements in a severe environment.

Description

Technical Field

[0001] This invention relates to the field of building insulation materials and inorganic adhesives, specifically to an inorganic rock wool adhesive and a method for preparing rock wool products therefrom, namely an environmentally friendly, high-performance inorganic rock wool adhesive and a method for preparing rock wool products using the adhesive. Background Technology

[0002] Rock wool, as an excellent thermal insulation material, is widely used in construction, industry, and other fields. Its performance largely depends on the quality of the adhesive. Traditional rock wool adhesives mostly use organic adhesives, which have drawbacks such as the release of harmful substances like formaldehyde and poor high-temperature resistance. Existing inorganic adhesives (such as ordinary cement-based adhesives) suffer from low bonding strength, poor water resistance, and long curing times, resulting in insufficient mechanical properties and short service life for rock wool products, limiting their application in harsh environments. Summary of the Invention

[0003] (a) Technical problems to be solved The present invention aims to provide an environmentally friendly, non-toxic, high-strength, and water- and weather-resistant inorganic adhesive for rock wool, and to provide a method for preparing rock wool products using this adhesive, so as to improve the overall performance and applicability of rock wool products.

[0004] (II) Technical Solution 1. A rock wool inorganic adhesive and a method for preparing rock wool products thereof, wherein the rock wool inorganic adhesive formulation (by weight parts) - Composite inorganic cementitious system: 30-50 parts of phosphoaluminate cement, 15-25 parts of metakaolin, and 5-10 parts of nano silica; - Functional admixtures: 1-3 parts polycarboxylate superplasticizer, 2-5 parts silicone water repellent, 3-8 parts chopped glass fiber; - Solvent: 20-30 parts water.

[0005] 2. A rock wool inorganic adhesive and a method for preparing the rock wool product thereof, wherein the method for preparing the rock wool inorganic adhesive... 1. Dry mixing and dispersion: Add phosphoaluminate cement, metakaolin, and nano silica to a mixer and dry mix for 5-10 minutes to ensure uniform dispersion of the powder; 2. Additive incorporation: Add polycarboxylate superplasticizer, silicone water-repellent agent, and chopped glass fiber, and continue stirring for 3-5 minutes to ensure that the additives are fully incorporated into the powder; 3. Pulping: Add the prescribed amount of water and stir at high speed for 8-15 minutes to form a uniform, fluid adhesive slurry.

[0006] 3. A rock wool inorganic adhesive and a method for preparing the rock wool product thereof, wherein the rock wool product preparation method... 1. Rock wool board pretreatment: Clean impurities from the surface of the rock wool board and roughen the surface by mechanical grinding to increase the bonding area; 2. Adhesive coating: Apply the adhesive evenly to the upper and lower surfaces and sides of the rock wool board using roller coating or spraying methods, with the coating amount controlled at 200-300g / m². 3. Composite reinforcement (optional): Before the adhesive cures, a layer of fiberglass mesh is laid to enhance the overall mechanical properties of the rock wool product; 4. Curing and maintenance: Place the coated rock wool board in an environment with a temperature of 20-30℃ and a relative humidity of ≥50% for 1-3 days to allow the adhesive to fully cure; 5. Post-processing: Cutting, shaping and other processing are carried out according to requirements to obtain final products such as rock wool insulation boards and rock wool composite boards.

[0007] (III) Beneficial Effects 1. Environmental friendliness: Made with all inorganic components and environmentally friendly additives, it releases no harmful substances such as formaldehyde and benzene, meeting the requirements of green building materials; 2. Bond strength: The high strength of phosphoaluminate cement, combined with the reinforcement of nanomaterials and the bridging effect of chopped glass fibers, increases the bond strength between the adhesive and rock wool by more than 20% compared to traditional products. 3. Water and weather resistance: Organosilicon water-repellent agents give adhesives excellent water resistance, and the weather resistance of phosphoaluminate cement is far superior to that of ordinary cement, ensuring the long-term stable performance of rock wool products in humid and outdoor environments; 4. Economic efficiency: The preparation process is simple and easy to control, with a short curing time, making it suitable for large-scale industrial production. Detailed Implementation Example

[0008] 1. Adhesive formulation (parts by weight) 40 parts of phosphoaluminate cement, 20 parts of metakaolin, 8 parts of nano silica, 2 parts of polycarboxylate superplasticizer, 3 parts of organosilicon water-repellent agent, 5 parts of chopped glass fiber, and 25 parts of water.

[0009] 2. Adhesive preparation - Dry mix: Dry mix phosphoaluminate cement, metakaolin, and nano silica for 8 minutes; - Add admixtures: Add polycarboxylate superplasticizer, silicone water-repellent agent, and chopped glass fiber, and stir for 4 minutes; - Pulping: Add water and stir at high speed for 12 minutes to obtain a uniform slurry.

[0010] 3. Rock wool product preparation - Pretreatment: Select rock wool board with a density of 120kg / m³ and mechanically grind the surface; - Coating: Roller coating of adhesive, coating amount 250g / m²; - Composite reinforcement: Laying 160g / m² fiberglass mesh; - Maintenance: Maintain for 2 days at 25℃ and 60% relative humidity; - Performance test: Bond strength 0.25MPa (far exceeding the national standard requirement of ≥0.10MPa), strength retention rate 92% after immersion in water for 7 days.

[0011] This invention addresses the shortcomings of traditional rock wool adhesives, such as environmental friendliness, strength, and weather resistance, through innovative inorganic cementing system design and optimized preparation process, providing a new solution for high-performance and green rock wool products.

Claims

1. A rock wool inorganic binder and a rock wool product production method thereof, the rock wool inorganic binder being characterized by, By weight, it consists of the following components: ​ The composite inorganic cementitious system consists of 30-50 parts phosphoaluminate cement, 15-25 parts metakaolin, and 5-10 parts nano-silica. Functional admixtures: 1-3 parts polycarboxylate superplasticizer, 2-5 parts silicone water-repellent agent, 3-8 parts chopped glass fiber; 20-30 parts water.

2. The rock wool inorganic adhesive according to claim 1, characterized in that, In the composite inorganic cementitious system, the weight parts of phosphoaluminate cement are 35-45 parts, metakaolin are 18-22 parts, and nano silica are 7-9 parts.

3. The rock wool inorganic adhesive according to claim 1, characterized in that, In the functional additives, the polycarboxylate superplasticizer is 1.5-2.5 parts by weight, the silicone water-repellent agent is 3-4 parts, and the chopped glass fiber is 4-6 parts.

4. The rock wool inorganic adhesive according to claim 1, characterized in that, The water is in the form of 22-28 parts by weight.

5. A method of preparing the rock wool inorganic binder according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1: Dry mixing and dispersion. Add phosphoaluminate cement, metakaolin, and nano silica to the mixer and dry mix for 5-10 minutes to ensure uniform dispersion of the powder. S2: Additives are incorporated by adding polycarboxylate superplasticizer, organosilicon water-repellent agent, and chopped glass fiber. Continue stirring for 3-5 minutes to ensure that the additives are fully combined with the powder. S3: Pulping: Add the prescribed amount of water and stir at high speed for 8-15 minutes to form a uniform, fluid adhesive slurry.

6. The method of claim 5, wherein, The dry mixing time in step S1 is 7-9 minutes, the stirring time in step S2 is 3.5-4.5 minutes, and the high-speed stirring time in step S3 is 10-13 minutes.

7. A method for preparing a rock wool product using the rock wool inorganic adhesive according to any one of claims 1 to 4, characterized in that, Includes the following steps: T1: Rock wool board pretreatment, cleaning impurities from the surface of the rock wool board, and roughening the surface by mechanical grinding; T2: Adhesive coating, using roller coating or spraying, the adhesive is evenly applied to the upper and lower surfaces and sides of the rock wool board, with the coating amount controlled at 200-300g / m². T3: Composite reinforcement (optional), a layer of fiberglass mesh is laid before the adhesive cures; T4: Curing and maintenance. Place the coated rock wool board in an environment with a temperature of 20-30℃ and a relative humidity of ≥50% for 1-3 days. T5: Post-processing, cutting and shaping according to requirements to obtain rock wool products.

8. The method of rock wool product production according to claim 7, characterized in that, In step T2, the amount of adhesive applied is 230-270 g / m². In step T4, the curing environment temperature is 23-27℃, the relative humidity is 55%-65%, and the curing time is 1.5-2.5 days.

9. The method of rock wool product production according to claim 7, characterized in that, In step T3, the basis weight of the glass fiber mesh is 140-180 g / m².

10. A rock wool product obtainable by the method of any of claims 7-9, characterized in that, The bonding strength of the rock wool product is ≥0.20MPa, and the strength retention rate after immersion in water for 7 days is ≥90%.