Production and preparation method of melamine resin thermal insulation light material

Abstract

The invention discloses a production and preparation method of a melamine resin thermal insulation light material, and relates to the technical field of melamine resin preparation. Performing premixing reaction; foaming and curing; carrying out post-treatment; performance optimization and quality detection are carried out. Expanded perlite and hollow glass beads are compounded into light filler, ammonium bicarbonate and azodicarbonamide are matched to compound a foaming agent, the limitation of a traditional single raw material is broken through, low density and excellent heat preservation performance are considered, in the process, the filler is pretreated with a silane coupling agent, interface bonding is improved, premixing is conducted, temperature is accurately controlled, and pH is adjusted; the precision and the performance are improved by virtue of numerical control cutting and compressed air in post-treatment; a high-heat-preservation and high-strength product can be prepared by adjusting the raw material ratio; the environment-friendly stability is realized; the water absorption rate is reduced by selecting green raw materials and spraying an organic silicon waterproof agent; and better use prospects and commercial values are brought.

Description

Technical Field

[0001] This invention relates to the field of melamine resin preparation technology, and specifically to a method for producing melamine resin thermal insulation lightweight materials. Background Technology

[0002] Currently, with the increasing demands for material performance in construction, home furnishing, and industrial fields, melamine resin lightweight insulation materials are gradually becoming a popular choice in the market. Melamine resin, due to its good thermal stability, strong fire resistance, and excellent mechanical strength, is widely used in various fields, especially in thermal insulation, heat insulation, and lightweight structural materials. However, traditional melamine resin materials often suffer from high density and unsatisfactory thermal conductivity, limiting their application in scenarios such as high-efficiency energy saving and green building.

[0003] To address these challenges, researchers are optimizing formulations and processes to develop melamine resin insulation materials that combine excellent thermal insulation properties with lightweight and environmentally friendly characteristics. By selecting appropriate lightweight fillers, foaming agents, and modifiers, the density can be reduced, the insulation effect enhanced, and the mechanical properties improved to meet diverse application requirements. Summary of the Invention

[0004] To solve the above-mentioned technical problems, a method for producing lightweight thermal insulation materials using melamine resin is provided. This technical solution solves the aforementioned problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The production and preparation method of melamine resin thermal insulation lightweight material includes: 100 parts melamine resin, 60-80 parts formaldehyde solution (mass fraction 37%), 25-40 parts lightweight filler, 5-10 parts foaming agent, 2-5 parts curing agent, and 1-3 parts surface modifier.

[0006] Preferably, the melamine resin is the main film-forming substance, providing the material with basic thermal insulation performance and structural stability. The formaldehyde solution is used to undergo a polycondensation reaction with the melamine resin to adjust the degree of resin crosslinking. The lightweight filler is a mixture of expanded perlite (particle size 0.1-0.5 mm) and hollow glass microspheres (particle size 50-100 μm) in a mass ratio of 3:1-2:1, which reduces the material density and enhances the thermal insulation effect. The foaming agent is a mixture of ammonium bicarbonate and azodicarbonamide in a mass ratio of 2:1 to generate uniform bubbles and achieve material lightweighting. The curing agent is oxalic acid or p-toluenesulfonic acid to promote resin curing and molding. The surface modifier is silane coupling agent KH-570, which improves the interfacial bonding between the lightweight filler and the melamine resin and enhances the mechanical strength of the material.

[0007] Preferably, the preparation steps include: S1. Raw material pretreatment: Select melamine resin, formaldehyde solution, lightweight filler, foaming agent, curing agent and surface modifier according to the set ratio, and dry the lightweight filler to remove residual moisture; S2. Premixing reaction: Mix melamine resin with formaldehyde solution, adjust the pH value, heat and stir, then add the lightweight filler treated with surface modifier, and continue stirring until the mixture is uniform. S3. Foaming and curing: Add foaming agent and curing agent to the premix, stir quickly, pour into the mold, and place in a constant temperature oven to complete the foaming and curing reaction; S4. Post-processing: Remove the cured foam from the mold, cut and trim it, and remove surface impurities and irregular protrusions. S5. Performance Optimization: The repaired material is surface-waterproofed by spraying a waterproofing agent to form a protective film. S6. Quality Inspection: Inspect the key properties of the material, such as density, thermal conductivity, and compressive strength, to ensure that they meet the standard requirements.

[0008] Preferably, the pretreatment of the S1 raw material specifically includes: drying expanded perlite and hollow glass microspheres in a constant temperature drying oven at 45-55℃ for 2-3 hours, and checking that the moisture content is ≤1%. If the moisture content exceeds the standard, the drying time is extended; diluting the surface modifier silane coupling agent KH-570 with ethanol (95% by mass) to a 5% by mass solution, mixing it with the light filler at a mass ratio of 1:10, and stirring it in a high-speed mixer (300-400 rpm) for 15-20 minutes to make the modifier uniformly coat the surface of the filler, and then drying it at 60-70℃ for 1 hour to remove residual ethanol.

[0009] Preferably, the S2 premixing reaction specifically includes: adding melamine resin and formaldehyde solution to a reaction vessel, adjusting the pH of the system to 8.0-8.5 with triethanolamine, heating to 70-80°C, and stirring at 150-200 rpm for 30-40 minutes to allow the two to initially condense; then cooling to 50-60°C, adding pretreated lightweight filler, and continuing to stir at 120-150 rpm for 25-35 minutes, taking samples every 10 minutes during this period to ensure that the filler does not agglomerate and that the uniformity of the mixed system is ≥95%.

[0010] Preferably, the S3 foaming and curing process specifically includes: adding a foaming agent and a curing agent to the premix, stirring at a high speed of 300-400 rpm for 5-8 minutes to ensure complete dispersion of the additives; quickly pouring the mixture into a mold preheated to 40-50°C (the inner wall of the mold is coated with a release agent), the mold specifications being set according to the finished product size; placing the mold in a constant temperature oven, using a segmented heating process: first, maintaining the temperature at 60-70°C for 30-40 minutes to promote the decomposition of the foaming agent and the generation of bubbles; then raising the temperature to 80-90°C and maintaining it for 60-90 minutes to accelerate resin curing. During the curing process, the bubble morphology is observed every 20 minutes to ensure that the bubble diameter is uniform (0.1-0.3 mm) and there is no cracking or collapse.

[0011] Preferably, the S4 post-processing specifically includes: demolding after the mold cools to room temperature (25-30℃), cutting the foam with a CNC cutting machine, controlling the cutting accuracy to ±0.5mm, removing the dense layer and irregular protrusions with a surface thickness ≥1mm; after cutting, blowing the material surface with compressed air (pressure 0.4-0.6MPa) to remove residual debris and dust, ensuring surface cleanliness.

[0012] Preferably, the S5 performance optimization specifically includes: applying a waterproof coating to the material surface using a spraying method, with the waterproofing agent being an organosilicon waterproofing agent (10% by mass), a spraying pressure of 0.3-0.5 MPa, a spraying distance of 20-30 cm, ensuring uniform coating coverage, and controlling the coating thickness to 0.1-0.2 mm; after spraying, placing the material in a constant temperature oven at 50-60℃ for 1-2 hours to allow the waterproofing agent to fully cure, forming a continuous waterproof membrane, with a material water absorption rate ≤3%.

[0013] Preferably, the S6 quality inspection specifically includes: density testing using the water displacement method, taking samples from 3 different locations, and testing the material density to be ≤150kg / m³; thermal conductivity being determined using the steady-state plate method, with a thermal conductivity ≤0.030W / (m・K); compressive strength being tested using a universal testing machine, with a loading rate of 2mm / min, and a compressive strength ≥0.3MPa; the qualified materials are sealed and packaged, and stored in a cool, dry place (temperature 15-25℃, relative humidity ≤60%), with sampling and retesting every 3 months during the storage period to ensure no significant performance degradation.

[0014] Preferably, when preparing high-insulation materials, the proportion of lightweight fillers is adjusted, the amount of hollow glass microspheres is increased, so that the mass ratio of expanded perlite to hollow glass microspheres is 1:1, and the amount of foaming agent is increased to 8-10 parts, ensuring that the material bubble rate is ≥85% and the thermal conductivity is ≤0.025W / (m・K); when preparing high-strength materials, the amount of lightweight fillers is reduced to 25-30 parts, the amount of curing agent is increased to 4-5 parts, the curing temperature is increased to 90-100℃, and the insulation time is extended to 100-120 minutes, so that the material compressive strength is ≥0.5MPa, meeting the requirements of load-bearing scenarios.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention relates to a lightweight melamine resin thermal insulation material with several significant advantages. In terms of thermal insulation performance, the composite expanded perlite and hollow glass microspheres effectively optimize the material's thermal conductivity, significantly reducing it and resulting in excellent insulation performance, making it suitable for high-efficiency energy-saving buildings and other locations with high thermal insulation requirements. Regarding lightweighting, the combination of a foaming agent and lightweight filler lowers the final product's density, reducing its weight while maintaining excellent thermal performance, thus meeting the demand for lightweight structural materials. In terms of mechanical properties, the use of surface modifiers such as silane coupling agents improves the interfacial bonding between the lightweight filler and melamine resin, enhancing the material's properties. The material boasts excellent mechanical strength and compressive properties, making it suitable for applications requiring load-bearing capacity. Environmentally, all raw materials meet green and environmentally friendly requirements, minimizing pollution during production and ensuring the finished product is recyclable, aligning with modern green building material development trends. Furthermore, the material is highly adjustable; by adjusting the proportion of lightweight fillers and the ratio of foaming agents and curing agents, high-insulation or high-strength materials can be prepared to meet different needs, offering high flexibility and a wide range of applications. Simultaneously, the production processes, including raw material pretreatment, premixing reaction, foaming and curing, and post-treatment, are rationally designed, simple, and efficient, ensuring stable product quality and high production efficiency. Attached Figure Description

[0016] Figure 1 This is a flowchart of the preparation process steps of the present invention. Detailed Implementation

[0017] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0018] Example 1 (Conventional melamine resin thermal insulation lightweight material) Raw material formulation (based on 100 parts of melamine resin) Melamine resin: 100 parts; Formaldehyde solution (37% by mass): 70 parts; Lightweight filler: 22.5 parts expanded perlite (particle size 0.2-0.4 mm) + 7.5 parts hollow glass microspheres (particle size 60-80 μm) (mass ratio 3:1), total 30 parts; Foaming agent: 6.7 parts ammonium bicarbonate + 3.3 parts azodicarbonamide (mass ratio 2:1), total 10 parts; Curing agent: 3 parts oxalic acid; Surface modifier: 2 parts of silane coupling agent KH-570 (5% ethanol solution by mass); Preparation process parameters S1. Raw material pretreatment: Lightweight filler is dried in a constant temperature drying oven at 50℃ for 2.5 hours, with a moisture content of 0.8%; Modifier and filler are mixed at a ratio of 1:10, stirred at 350 rpm for 18 minutes, and dried at 65℃ for 1 hour. S2, Premixed reaction: Adjust the pH to 8.2 with triethanolamine, stir at 180 rpm for 35 minutes at 75°C, cool to 55°C, add the filler, stir at 130 rpm for 30 minutes, and achieve a mixing uniformity of 96%. S3 foaming and curing: Stir at 350 rpm for 7 minutes, pour into a preheated mold at 45℃ (apply release agent); oven temperature rise in stages: keep at 65℃ for 35 minutes, keep at 85℃ for 75 minutes, bubble diameter 0.15-0.25mm; S4 post-processing: Cool to 28℃ for demolding, CNC cutting accuracy ±0.4mm, 0.5MPa compressed air to blow the surface; S5 performance optimization: 10% silicone waterproofing agent spraying (pressure 0.4MPa, distance 25cm), coating thickness 0.15mm, drying at 55℃ for 1.5 hours; Example 2 (High-insulation melamine resin lightweight insulation material) Raw material formulation (based on 100 parts of melamine resin) Melamine resin: 100 parts; Formaldehyde solution (37% by mass): 75 parts; Lightweight filler: 15 parts expanded perlite (particle size 0.1-0.3mm) + 15 parts hollow glass microspheres (particle size 50-70μm) (mass ratio 1:1), total 30 parts; Foaming agent: 5.3 parts ammonium bicarbonate + 2.7 parts azodicarbonamide (mass ratio 2:1), total 8 parts; Curing agent: 3.5 parts p-toluenesulfonic acid; Surface modifier: 2.5 parts of silane coupling agent KH-570 (5% ethanol solution by mass); Preparation process parameters S1. Raw material pretreatment: Lightweight filler is dried in a constant temperature drying oven at 48℃ for 3 hours, with a moisture content of 0.6%; Modifier and filler are mixed at a ratio of 1:10, stirred at 380 rpm for 20 minutes, and dried at 68℃ for 1 hour. S2, Premixed reaction: Adjust the pH to 8.4 with triethanolamine, stir at 190 rpm for 38 minutes at 78℃, cool to 58℃, add the filler, stir at 140 rpm for 32 minutes, and achieve a mixing uniformity of 97%. S3. Foaming and curing: Stir at 380 rpm for 8 minutes, pour into a preheated mold at 48℃ (apply release agent); oven temperature rise in stages: keep at 68℃ for 40 minutes, keep at 88℃ for 80 minutes, bubble diameter 0.1-0.2mm, bubble rate 88%; S4. Post-processing: Cool to 27℃ for demolding, CNC cutting accuracy ±0.3mm, and surface purging with 0.55MPa compressed air; S5, Performance Optimization: 10% silicone waterproofing agent spraying (pressure 0.45MPa, distance 22cm), coating thickness 0.12mm, drying at 58℃ for 1.2 hours; Example 3 (High-strength melamine resin thermal insulation lightweight material) Raw material formulation (based on 100 parts of melamine resin) Melamine resin: 100 parts; Formaldehyde solution (37% by mass): 65 parts; Lightweight filler: 18 parts expanded perlite (particle size 0.3-0.5mm) + 7 parts hollow glass microspheres (particle size 80-100μm) (mass ratio approximately 2.6:1), totaling 25 parts; Foaming agent: 4 parts ammonium bicarbonate + 2 parts azodicarbonamide (mass ratio 2:1), total 6 parts; Curing agent: 5 parts oxalic acid; Surface modifier: 3 parts of silane coupling agent KH-570 (5% ethanol solution by mass); Preparation process parameters S1. Raw material pretreatment: Lightweight filler is dried in a constant temperature drying oven at 55℃ for 2 hours, with a moisture content of 0.9%; Modifier and filler are mixed at a ratio of 1:10, stirred at 320 rpm for 15 minutes, and dried at 70℃ for 1 hour. S2. Premixing reaction: Adjust the pH to 8.0 with triethanolamine, stir at 160 rpm for 32 minutes at 72℃, cool to 52℃, add the filler, stir at 120 rpm for 28 minutes, achieving a mixing homogeneity of 95%. S3. Foaming and curing: Stir at 320 rpm for 6 minutes, pour into a preheated mold at 42℃ (apply release agent); oven heating in stages: keep at 62℃ for 32 minutes, keep at 95℃ for 110 minutes, bubble diameter 0.2-0.3mm; S4. Post-processing: Cool to 26℃ for demolding, CNC cutting accuracy ±0.4mm, and surface purging with 0.45MPa compressed air; S5 performance optimization: 10% silicone waterproofing agent spraying (pressure 0.35MPa, distance 28cm), coating thickness 0.18mm, drying at 52℃ for 1.8 hours; Comparative example (traditional phenolic resin insulation material) Raw material formula (based on 100 parts of phenolic resin) Phenolic resin: 100 parts; Formaldehyde solution (37% by mass): 50 parts; Lightweight filler: 40 parts of single expanded perlite (particle size 0.2-0.5mm); Foaming agent: 8 parts ammonium bicarbonate (single component); Curing agent: 2 parts hydrochloric acid; Surface modifier: None; Preparation process parameters Raw material pretreatment: Expanded perlite was simply dried at 60℃ for 4 hours, without any modification treatment; Premixing reaction: No pH adjustment, stirring at 100 rpm for 20 minutes at 65℃, then directly adding filler and mixing for 15 minutes, with a mixing uniformity of 85%; Foaming and curing: Stir at 200 rpm for 5 minutes, pour into a room temperature mold; cure at a constant temperature of 75℃ in an oven for 120 minutes, without staged temperature increases; Post-processing: Demold naturally after cooling to room temperature, then cut using standard methods (accuracy ±1.5mm) without compressed air blowing; Performance optimization: No waterproofing treatment.

[0019] The table below compares the performance of different groups of melamine resin thermal insulation lightweight materials. All performance indicators were tested according to the same standards: density was measured by the drainage method, thermal conductivity by the steady-state plate method, compressive strength by a universal testing machine (loading rate 2 mm / min), water absorption by the 24-hour immersion method, and the storage environment was 15-25℃ and relative humidity ≤60%. As can be seen from the comparison, the embodiments of the present invention are significantly superior to traditional phenolic resin insulation materials in terms of lightweight (lower density), thermal insulation (lower thermal conductivity), mechanical strength (higher compressive strength), waterproofness (lower water absorption rate) and performance stability (smaller change rate of thermal conductivity after storage). Furthermore, Embodiment 2 (high thermal insulation type) and Embodiment 3 (high strength type) can be adapted to different scenario requirements by adjusting the formula.

[0020] In summary, the advantages of this invention are: By using lightweight fillers made of composite expanded perlite and hollow glass microspheres, the thermal conductivity of the material is optimized and significantly reduced, resulting in excellent thermal insulation performance. It is suitable for high-efficiency energy-saving buildings and other places with high thermal insulation requirements. By using a combination of foaming agents and lightweight fillers, the final product has a lower density, which reduces the material's weight while maintaining excellent thermal properties, thus meeting the demand for lightweight structural materials. The use of surface modifiers (such as silane coupling agents) improves the interfacial bonding between lightweight fillers and melamine resin, enhances the mechanical strength of the material, and strengthens its compressive strength, making it suitable for applications requiring load-bearing capacity. All raw materials selected meet green and environmental protection requirements, the entire production process reduces pollution to the environment, and the finished products are recyclable, which is in line with the development trend of modern green building materials. By adjusting the proportion of lightweight fillers and the ratio of foaming agent to curing agent, this method can prepare high-insulation or high-strength materials for different needs, offering high flexibility and wide applicability. The production steps adopted, such as raw material pretreatment, premixing reaction, foaming and curing, and post-treatment, are reasonable, simple and efficient, and can ensure stable product quality and high production efficiency. The lightweight filler, which is a composite of expanded perlite and hollow glass microspheres, is combined with a foaming agent, which is a composite of ammonium bicarbonate and azodicarbonamide. This breaks through the limitations of traditional single filler and single foaming agent, and significantly optimizes the thermal insulation performance while reducing the material density. Lightweight fillers are pretreated with a surface modifier (silane coupling agent KH-570) to improve interfacial bonding. The pH value and temperature are precisely adjusted during the premixing reaction stage to control the polycondensation process. The foaming and curing process adopts a segmented heating process to ensure uniform and stable bubbles. The post-processing introduces CNC cutting and compressed air purging to improve product precision and cleanliness, forming a refined control system for the entire process. By adjusting the proportion of lightweight fillers and the amount of foaming agent and curing agent, high-insulation materials with thermal conductivity as low as 0.023 W / (m・K) or high-strength materials with compressive strength up to 0.52 MPa can be flexibly prepared to meet the needs of different scenarios. By selecting raw materials that meet green standards and adding an organosilicon waterproofing agent to optimize waterproof performance (water absorption rate ≤2.5%), and with a low performance degradation rate during the storage period of the finished product, it is significantly better than traditional phenolic resin insulation materials, achieving a synergistic improvement in technical performance and environmental protection requirements.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A method for producing lightweight thermal insulation materials using melamine resin, characterized in that, include: 100 parts melamine resin, 60-80 parts formaldehyde solution, 25-40 parts lightweight filler, 5-10 parts foaming agent, 2-5 parts curing agent, and 1-3 parts surface modifier.

2. The method for producing the melamine resin thermal insulation lightweight material according to claim 1, characterized in that: The melamine resin serves as the main film-forming substance, providing the material with basic thermal insulation performance and structural stability. The formaldehyde solution is used to undergo a polycondensation reaction with the melamine resin to adjust the degree of resin crosslinking. The lightweight filler is a mixture of expanded perlite and hollow glass microspheres in a mass ratio of 3:1 to 2:1, which reduces the material density and enhances the thermal insulation effect. The foaming agent is a mixture of ammonium bicarbonate and azodicarbonamide in a mass ratio of 2:1, which generates uniform bubbles to achieve material lightweighting. The curing agent is oxalic acid or p-toluenesulfonic acid, which promotes resin curing and molding. The surface modifier is silane coupling agent KH-570, which improves the interfacial bonding between the lightweight filler and the melamine resin and enhances the mechanical strength of the material.

3. The method for producing and preparing melamine resin thermal insulation lightweight material according to claim 2, characterized in that, The preparation steps include: S1. Raw material pretreatment: Select melamine resin, formaldehyde solution, lightweight filler, foaming agent, curing agent and surface modifier according to the set ratio, and dry the lightweight filler to remove residual moisture; S2. Premixing reaction: Mix melamine resin with formaldehyde solution, adjust the pH value, heat and stir, then add the lightweight filler treated with surface modifier, and continue stirring until the mixture is uniform. S3. Foaming and curing: Add foaming agent and curing agent to the premix, stir quickly, pour into the mold, and place in a constant temperature oven to complete the foaming and curing reaction; S4. Post-processing: Remove the cured foam from the mold, cut and trim it, and remove surface impurities and irregular protrusions. S5. Performance Optimization: The repaired material is surface-waterproofed by spraying a waterproofing agent to form a protective film. S6. Quality Inspection: Inspect the key properties of the material, such as density, thermal conductivity, and compressive strength, to ensure that they meet the standard requirements.

4. The method for producing and preparing the melamine resin thermal insulation lightweight material according to claim 3, characterized in that, The pretreatment of raw material S1 specifically includes: drying expanded perlite and hollow glass microspheres in a constant temperature drying oven at 45-55℃ for 2-3 hours, and checking that the moisture content is ≤1%. If the moisture content exceeds the standard, the drying time is extended; diluting the surface modifier silane coupling agent KH-570 with ethanol to a 5% mass fraction solution, mixing it with the light filler at a mass ratio of 1:10, and stirring in a high-speed mixer for 15-20 minutes to make the modifier uniformly coat the surface of the filler, and then drying at 60-70℃ for 1 hour to remove residual ethanol.

5. The method for producing and preparing the melamine resin thermal insulation lightweight material according to claim 3, characterized in that, The S2 premixing reaction specifically includes: adding melamine resin and formaldehyde solution to a reaction vessel, adjusting the pH of the system to 8.0-8.5 with triethanolamine, heating to 70-80℃, and stirring at 150-200 rpm for 30-40 minutes to allow the two to initially condense; then cooling to 50-60℃, adding pretreated lightweight filler, and continuing to stir at 120-150 rpm for 25-35 minutes, taking samples every 10 minutes during this period to ensure that the filler does not agglomerate and that the uniformity of the mixed system is ≥95%.

6. The method for producing and preparing the melamine resin thermal insulation lightweight material according to claim 3, characterized in that, The S3 foaming and curing process specifically includes: adding a foaming agent and a curing agent to the premix, stirring at a high speed of 300-400 rpm for 5-8 minutes to ensure complete dispersion of the additives; quickly pouring the mixture into a mold preheated to 40-50℃, with the mold specifications set according to the finished product size; placing the mold in a constant temperature oven and using a segmented heating process: first, maintaining the temperature at 60-70℃ for 30-40 minutes to promote the decomposition of the foaming agent and generate bubbles; then raising the temperature to 80-90℃ and maintaining it for 60-90 minutes to accelerate resin curing. During the curing process, the bubble morphology is observed every 20 minutes to ensure that the bubble diameter is uniform and there is no cracking or collapse.

7. The method for producing and preparing the melamine resin thermal insulation lightweight material according to claim 3, characterized in that, The S4 post-processing specifically includes: after the mold cools to room temperature, demolding, cutting the foam with a CNC cutting machine, controlling the cutting accuracy to ±0.5mm, removing the dense layer and irregular protrusions with a surface thickness ≥1mm; after cutting, blowing the material surface with compressed air to remove residual debris and dust, ensuring surface cleanliness.

8. The method for producing and preparing the melamine resin thermal insulation lightweight material according to claim 3, characterized in that, The S5 performance optimization specifically includes: applying a waterproof coating to the material surface using a spraying method, with the waterproofing agent being an organosilicon waterproofing agent, a spraying pressure of 0.3-0.5 MPa, a spraying distance of 20-30 cm, ensuring uniform coating coverage, and controlling the coating thickness to 0.1-0.2 mm; after spraying, placing the material in a constant temperature oven at 50-60℃ for 1-2 hours to allow the waterproofing agent to fully cure, forming a continuous waterproof membrane, with a material water absorption rate ≤3%.

9. The method for producing and preparing the melamine resin thermal insulation lightweight material according to claim 3, characterized in that, The S6 quality inspection specifically includes: density testing using the water displacement method, taking samples from 3 different locations, and testing the material density to be ≤150kg / m³; thermal conductivity testing using the steady-state plate method, with a thermal conductivity ≤0.030W / (m・K); compressive strength testing using a universal testing machine, with a loading rate of 2mm / min, and a compressive strength ≥0.3MPa; and sealing the qualified materials in sealed packaging and storing them in a cool, dry place, with sampling and retesting every 3 months during the storage period to ensure no significant performance degradation.

10. The method for producing the melamine resin thermal insulation lightweight material according to claim 1, characterized in that: When it is necessary to prepare high thermal insulation materials, adjust the proportion of lightweight fillers, increase the amount of hollow glass microspheres, so that the mass ratio of expanded perlite to hollow glass microspheres is 1:1, and increase the amount of foaming agent to 8-10 parts. When preparing high-strength materials, reduce the amount of lightweight filler to 25-30 parts, increase the amount of curing agent to 4-5 parts, raise the curing temperature to 90-100℃, and extend the heat preservation time to 100-120 minutes to make the material compressive strength ≥0.5MPa, meeting the requirements of load-bearing scenarios.

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