Aluminium Paste & Powder for AAC

Aluminium Paste & Powder (APP) is a key aerating agent for producing lightweight aerated concrete. It reacts with alkaline substances to release hydrogen, creating a porous structure that enhances thermal insulation, soundproofing, and construction flexibility. Ideal for reducing building weight and improving earthquake resistance.

Дополнительная информация

Aluminium Paste & Powder for AAC

Aluminium Paste & Powder (APP) is a crucial aerating agent in producing AAC blocks. It reacts with alkaline substances to release hydrogen gas, forming a lightweight, porous structure. Below are the key aspects:

1. Function & Reaction Mechanism

1.1 Aeration Principle

In an alkaline environment (e.g., Ca(OH)₂), Aluminium Paste & Powder reacts with water to produce hydrogen gas:

2Al+3Ca(OH)2+6ЧАС2O3CaOAl2O36ЧАС2O+3ЧАС2

This reaction creates uniformly distributed pores within the slurry, reducing the final product density to 500-700 kg/m³—only one-fifth of conventional concrete.

1.2 Pore Structure Impact

The size and distribution of pores directly determine AAC’s insulation and soundproofing properties. To achieve an ideal pore structure, the aluminum particles must have a suitable fineness (≤3% residue on a 0.075mm sieve) and a high active aluminum content (≥85%).

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2. Production Process & Technical Requirements

2.1 Raw Materials & Preparation Process

  • Выбор материала: Aluminium foil scraps require oxide layer removal, while aluminum ingots must maintain uniform granularity.
  • Ball Milling: Wet milling with additives (such as dispersants and corrosion inhibitors) ensures precise temperature control to prevent oxidation.
  • Dehydration & Forming: Special equipment removes excess moisture, creating high dispersibility and stability aluminum paste.

2.2 Technical Specifications (Based on JC/T407-91 Standard)

ТипSolid Content (%)Fineness (0.075mm Residue)Gas Evolution Rate (%)Active Aluminum (%)
Oil-based GLY-75≥75≤3.0≥90≥90
Water-based GLS-65≥65≤3.0≥85≥85

3. Application Advantages & Market Trends

3.1 Comparison Between Aluminum Paste and Traditional Dry Aluminum Powder

CharacteristicAluminum Paste (Water-based)Dry Aluminum Powder
Production ProcessWet grinding, no need for degreasingDry grinding, requires degreasing
БезопасностьNo dust explosion riskFlammable and explosive, requires nitrogen protection
Ease of UseDirectly added to slurry, good dispersionRequires pre-degreasing treatment
Environmental ImpactLow pollution, easy wastewater treatmentHigh energy consumption, more pollution

3.2 Performance Advantages

  • Lightweight & High Strength: Reduces building weight by over 40%, enhancing earthquake resistance.
  • Thermal Insulation: Thermal conductivity ranges from 0.11 to 0.16 W/m·K, outperforming traditional brick walls.
  • Ease of Construction: The material can быть вырезанным and drilled, allowing for flexible applications in complex structures.

3.3 Market Trends

  • Price Fluctuations: Aluminium prices and energy costs influence market pricing, which will average around ¥10,000 per ton in 2024.
  • Regional Supply & Demand: Major production areas include Anhui, Shandong, and Jiangsu, while demand in the southwest region is growing significantly.
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4. Quality Control & Testing Methods

Below are key testing methods and technical requirements based on industry standards and practical applications:

4.1 Key Physical Property Tests

4.1.1 Active Aluminium Content Measurement

  • Principle: Hydrogen gas volume from the reaction between Aluminium Paste & Powder and an alkaline solution determines the active aluminum content (theoretical aeration capacity: 1.24 L/g).
  • Method: Operators follow JC/T407 standards using a gas evolution apparatus (featuring reaction bottles, gas volume tubes, and thermostatic baths). The hydrogen gas volume is recorded and adjusted based on temperature and pressure to calculate active aluminum content.
  • Standard: Oil-based aluminum paste must have an active aluminum content of ≥90%, while water-based aluminum paste must be ≥85%.

4.1.2 Fineness Testing

  • Sieving Method: Dried aluminum powder is sieved using a 0.075mm copper mesh (wet sieving with a dispersing agent), with a residue requirement of ≤3%.
  • Laser Particle Analysis: Used to verify uniform particle distribution and optimize milling processes.

4.1.3 Solid Content Measurement

  • Procedure: Weigh aluminum paste samples, dry at 105°C until constant weight, and calculate solid content. (Oil-based ≥75%, water-based ≥65%).

4.2 Chemical Performance Tests

4.2.1 Gas Evolution Characteristics

  • Gas Evolution Curve Test: Conducted at 45°C, where Aluminium Paste & Powder reacts with a cement-sodium hydroxide mixture. The gas evolution curve ensures synchrony between aeration and slurry thickening, preventing collapse or trapped gas.
  • Standard: Oil-based aluminum paste should achieve ≥50% gas evolution in 4 minutes, ≥80% in 16 minutes, and ≥90% in 30 minutes.

4.2.2 Hydrogen Evolution Test (for Passivated Aluminium Powder)

  • pH Monitoring Method: Aluminium powder is dispersed in water and heated to 60°C while monitoring pH changes. A drop to 4.19-4.23 within 35 minutes indicates excessive hydrogen evolution (failure), while a stable pH of 6-7 confirms passivation integrity.

4.2.3 Oxidation Degree Testing

  • Oxygen-Nitrogen Analyzer Method: Pre-treated Aluminium Paste & Powder are heated in a dual-layer graphite crucible (4.5kW), measuring released oxygen to evaluate oxide layer thickness and sintering quality.

4.3 Safety & Environmental Standards

4.3.1 Explosion Prevention

  • Dust Concentration Control: Maintain aluminum powder concentration below 10g/m³ to mitigate explosion risks.
  • Electrostatic Protection: Wet-process aluminum paste is preferred over dry powder to reduce dust explosion hazards.

4.3.2 Environmental Compliance

  • Wastewater Treatment: Monitor heavy metal content (e.g., aluminum ions) in wet milling effluents to ensure regulatory compliance.

4.4 Equipment & Standards Reference

  • Key Equipment: Laser particle analyzers, gas evolution measurement devices, oxygen-nitrogen analyzers, thermal gravimetric analyzers, precision pH meters.
    • Applicable Standards: JC/T407-2008: Aluminium paste technical specifications (active aluminum content, fineness, aeration rate).
    • GB/T11968-2023: Testing methods for autoclaved aerated concrete blocks.

4.5 Important Considerations

  • Sample Pre-Treatment: Before testing, remove oil contamination from aluminum powder via ultrasonic cleaning with petroleum ether, followed by drying.
  • Process Adaptation: Adjust the dosage of Aluminium Paste and powder based on slurry temperature and calcium-to-silicon ratio (0.55-0.80) to synchronize aeration with thickening.
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5. Impact of Gas Evolution Characteristics on AAC

5.1 Aeration Speed & Production Process Synchronization

5.1.1 Matching Aeration & Thickening

Aluminium Paste & Powder must aerate at a rate that aligns with slurry thickening:

  • Too Fast (e.g., >20ml in 2 minutes): Excessive gas release before slurry setting causes pore merging, collapse, or sedimentation.
  • Too Slow (e.g., <6ml in 2 minutes): Residual aluminum powder continues reacting after the slurry sets, leading to trapped gas, cracks, or uneven expansion.
  • Ideal Range: Data suggests optimal stability at 6-15ml in 2 minutes, 40-60ml in 8 minutes, and 70-90ml in 16 minutes.

5.1.2 Temperature Sensitivity

Maintain slurry temperature at 40-60°C. Excessive heat accelerates aeration, risking uncontrolled expansion, while low temperatures slow aeration, leading to uneven pore distribution.

5.2 Gas Evolution & Pore Structure

  • Pore Uniformity: High active aluminum content (≥85%) and fine particle size (≤3% residue on a 0.075mm sieve) ensure even aeration. Low activity or oversized particles create large, interconnected pores, reducing compressive strength by 15-30%.
    • Density & Functional Properties: Theoretical Gas Evolution: 1g of aluminum produces 1.24L hydrogen. Practical aeration should reach at least 90% of the theoretical value to ensure a 500-700 kg/m³ density.
    • Thermal & Acoustic Performance: When pore size ranges from 0.2-2mm and porosity is 70-85%, thermal conductivity drops to 0.11-0.16W/m·K, outperforming conventional brick walls by 4-5 times.

6. Optimization Strategies for Aeration Performance

6.1 Raw Material Selection

  • Prefer Water-Based Aluminium Paste (GLS-65): It offers better dispersion and minimizes dust explosion risks.
  • Active Aluminium Content Testing: For accurate results, utilize JC/T407 gas evolution measurement devices with temperature compensation.

6.2 Process Adjustments

  • Calcium-Silicon Ratio (0.55-0.80): Excessive alkalinity (high Ca(OH)₂ content) inhibits aluminum reactions.
  • Foam Stabilizers (e.g., Soluble Oil): Extend bubble stability by 30-50%, reducing collapse risks.

Fiver Star New Materials ensures optimal concrete quality, enhancing thermal efficiency, mechanical strength, and construction adaptability by fine-tuning aeration parameters.

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Specification of Aluminium Paste & Powder for AAC

Технические характеристики водорастворимой алюминиевой пасты

Estimated Cost of Aluminium Paste & Powder for AAC

Мы предлагаем вам полностью пообщаться с нами перед покупкой, мы обязательно рассмотрим все аспекты и предоставим справедливый и разумный план цен. Выбрав нас, вы получите лучший продукт и лучшее соотношение цены и качества.

Выбор правильной спецификации

Choosing the right size of product gives you the best value for money. Our Metal Flash Aluminum Silver Paste is available in a wide range of particle sizes and purities, with prices varying by specification. By communicating your needs in detail and choosing the right size, you can get the best value for your money.

Количество покупок

Чем больше количество товара, тем ниже цена за единицу товара. Объемные заказы позволяют нам лучше распределять производственные и операционные расходы, поэтому мы рады предложить скидки на оптовые закупки.

Условия оплаты

Сроки и способ оплаты, которые вы выберете, также повлияют на цену. Например, полная предоплата может привести к более выгодной цене, так как снижает стоимость капитала. Пожалуйста, обсудите наиболее подходящий вариант оплаты с нашим отделом продаж.

Транспорт

Транспорт и логистика также являются факторами, влияющими на общую стоимость владения. Разные виды транспорта и пункты назначения влекут за собой разные расходы на доставку. Также необходимо учитывать пошлины, страхование и другие расходы. Рассчитав эти факторы заранее, вы сможете более точно оценить общую стоимость.

Manufacturing Craft of Aluminium Paste & Powder for AAC

At Five Star Materials, our Aluminium Paste & Powder for AAC produced in a delicate and rigorous process. Below is our basic production process:

Подготовка сырья

Мы закупаем сырье высокой степени очистки у проверенных поставщиков, чтобы гарантировать качество нашей продукции от самого источника.

Дробление

Сырье дробится, чтобы превратить алюминиевые блоки в мельчайшие частицы для последующей обработки.

Процесс смешивания

Измельченный алюминиевый порошок смешивается с нашими специально разработанными растворителями и добавками, а затем смешивается в процессе высокоскоростного перемешивания. Этот этап очень важен, поскольку от него зависит стабильность алюминиевой пасты и форма частиц.

Фильтрация и тестирование

После измельчения алюминиевая паста проходит через систему фильтрации для удаления возможных примесей. Затем наша команда контроля качества проводит серию тестов продукта, таких как размер частиц, блеск, металлический оттенок и т. д., чтобы подтвердить, что продукт соответствует нашим высоким стандартам качества.

Упаковка и хранение

Продукты, прошедшие тщательную проверку, тщательно упаковываются и хранятся на наших складах, готовые к отправке нашим клиентам.

Обратите внимание, что это базовый производственный процесс, а точный процесс может меняться в зависимости от конкретных требований к продукту. Компания Five Star Materials очень серьезно относится к контролю качества и гарантирует, что наша продукция соответствует нашим строгим стандартам качества на каждом этапе производственного процесса.

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