Kaolin powder for paint and coating enhanced adhesion and matte finish interior exterior and decorative coating materials
Short Description:
The plastic industry’s continuous evolution necessitates advanced mineral fillers that can simultaneously optimize product performance, reduce production costs, and broaden application boundaries. Among these, surface-modified kaolin powder has emerged as a linchpin additive, revolutionizing the manufacturing of diverse plastic products including polypropylene (PP) injection-molded components, polyethylene (PE) films, and polyvinyl chloride (PVC) profiles. Unlike its unmodified counterpart, which often exhibits poor compatibility with plastic resins, surface-modified kaolin powder leverages silane or titanate coupling agents to form strong chemical bonds with polymer chains. This molecular-level interaction significantly enhances the mechanical strength, thermal stability, and dispersion uniformity within plastic matrices, making it an indispensable material in modern plastics manufacturing.
Mechanical Strength Augmentation
Mechanical resilience stands as a non-negotiable criterion for plastic products, particularly those deployed in demanding sectors such as automotive engineering, construction infrastructure, and consumer durables. Surface-modified kaolin powder, typically graded between 1000 and 2000 mesh, acts as a reinforcement agent by establishing an intricate network of mineral-polymer interfacial bonds. This network facilitates the even distribution of mechanical stress across the plastic matrix, preventing localized strain concentrations that could lead to failure.
In the automotive industry, where weight reduction and structural integrity are paramount, the addition of 10%-20% surface-modified kaolin powder (by weight) to PP automotive interior components—such as dashboard casings and door trims—has demonstrated remarkable improvements. Rigorous testing by a leading German automotive parts supplier revealed a 25%-35% increase in tensile strength, elevating values from 30 MPa to 37-40 MPa. Concurrently, the flexural modulus witnessed a 40%-50% enhancement, rising from 1500 MPa to 2100-2250 MPa. These gains enable manufacturers to reduce resin consumption by up to 15%, achieving substantial cost savings without compromising on product quality.
For PE agricultural films, the surface modification of kaolin powder ensures superior dispersion properties, effectively preventing particle agglomeration that can create structural weak points. Films incorporating 8%-12% of this modified powder exhibited a 30% boost in impact resistance, increasing from 8 kJ/m² to 10.4 kJ/m². This enhanced durability allows the films to withstand wind speeds of up to 18 m/s without tearing, providing reliable protection for various industrial applications beyond agriculture.
Thermal Performance Enhancement
Heat resistance represents another critical advantage of surface-modified kaolin powder in plastic applications. Many modern plastic products, including electrical enclosures, automotive underhood components, and construction materials, must endure elevated temperatures without degrading. The high alumina content (ranging from 38%-42%) in kaolin powder, combined with effective surface modification techniques, significantly improves the heat distortion temperature (HDT) of plastic compounds.
A prominent Italian PVC profile manufacturer successfully utilized surface-modified kaolin powder in window frame production, achieving a remarkable increase in HDT from 70°C to 85°C. This temperature tolerance upgrade ensures that the PVC frames can withstand prolonged exposure to direct sunlight in Mediterranean climates without warping or deformation. Similarly, for PP electrical enclosures housing heat-generating electronic components, the incorporation of kaolin powder raised the HDT from 110°C to 130°C, meeting stringent thermal requirements. Additionally, the powder effectively mitigates thermal shrinkage issues; PP injection-molded parts containing 15% kaolin powder exhibited a shrinkage rate of 1.2%, compared to 2.5% for unreinforced PP, ensuring precise dimensional accuracy during the manufacturing process.
Production Process and Technical Specifications
The production of surface-modified kaolin powder for plastics involves a meticulously engineered two-stage process: ore refining and surface treatment. Raw kaolin ore undergoes beneficiation via magnetic separation and froth flotation techniques to eliminate iron and titanium impurities, which can compromise the powder’s performance. Subsequently, the ore is ground to the desired particle size using dry grinding methods with air classifier mills, producing grades ranging from 1000 to 2000 mesh.
The surface modification stage employs high-speed mixers operating at 1500-2000 rpm to uniformly coat kaolin particles with coupling agents. Silane coupling agents, such as KH-550, are preferred for PP and PE applications due to their strong affinity for polyolefin polymers, while titanate coupling agents like TMC-101 are more suitable for PVC compounds. The coupling agent dosage is carefully controlled at 0.5%-1.5% of the kaolin powder’s weight to ensure complete particle coverage without excess material that could disrupt plastic processing. Post-modification, the powder is cooled to ambient temperature and sieved to remove any agglomerates, yielding a free-flowing, homogeneous product ready for integration into plastic formulations.
Key technical indicators govern the quality of surface-modified kaolin powder for plastics. Particle size distribution, measured by D50 values of 5-10 μm (1000 mesh) or 2-5 μm (2000 mesh), directly impacts dispersion and reinforcement efficacy. Whiteness, expressed as an L* value of ≥90%, ensures aesthetic compatibility in applications where color is a factor. Stringent moisture control (≤0.3%) prevents issues such as hydrolysis during plastic processing, while a coupling agent coverage rate of ≥95% guarantees optimal interfacial bonding. Oil absorption values between 20-25 mL/100g reflect the powder’s wetting characteristics, influencing compound viscosity and processing behavior. These parameters are rigorously tested using advanced analytical tools, including laser particle size analyzers, Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA).
Supply Chain Excellence and Technical Support
The supply chain infrastructure for surface-modified kaolin powder is optimized to align with the fast-paced production cycles of the plastic industry. Packaging options include 25kg multi-layer paper bags equipped with anti-static liners to prevent dust accumulation and ensure product integrity, as well as 1000kg bulk bags featuring forklift sleeves for efficient handling and storage. Delivery timelines are streamlined, with regional customers (e.g., shipments from China to Southeast Asia) receiving orders within 7-14 days, while international deliveries (such as those to Europe) are completed within 21-30 days.
Product Description
We have calcined kaolin, washed kaolin, metakaolin.
Calcined kaolin, also known as porcelain clay, It has high whiteness, high fineness, good plasticity, and has strong corrosion
resistance and good durability. It is an excellent raw material for making ceramics and rubber.
Calcined kaolin, also known as porcelain clay, It has high whiteness, high fineness, good plasticity, and has strong corrosion
resistance and good durability. It is an excellent raw material for making ceramics and rubber.
Details Images
Our advantage:
We are the directly factory, we can fast delivery, and we can supply any size of the tourmaline with high quality.
We are the directly factory, we can fast delivery, and we can supply any size of the tourmaline with high quality.
Also as a manufacturer, we can meet any of your customized requirements, such as special package, your own logo, natural ingredients, new mica color match, MSDS & TDS are available etc.
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Categories
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Industrial Grade
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Steel
Grade |
Ceramic Grade
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Fluorescence grade
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Optical
Grade |
High
Purity |
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Content not less than (%)
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93.0
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96.0
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98.0
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99.0
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99.8
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99.99
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Impurity content not more than
(%) |
Na
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0.05
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0.01
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0.002
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|||
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K
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0.05
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0.01
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0.002
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||||
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Ca
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|||||||
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Mg
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0.5
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0.1
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0.05
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0.05
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0.02
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||
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Si
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1%
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0.5
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0.1
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0.05
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0.01
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0.002
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SO4
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0.5
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0.1
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0.05
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0.03
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0.01
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0.005
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|
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Fe
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0.1
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0.05
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0.05
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0.001
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0.0005
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0.0001
|
|
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Cl
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0.1
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0.1
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0.05
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0.05
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0.01
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0.001
|
|
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Al
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0.1
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0.1
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0.05
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0.02
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0.002
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0.001
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|
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Cu
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0.05
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0.02
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0.002
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0.001
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0.0005
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0.0002
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|
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Heavy metals (Pb)
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0.05
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0.02
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0.002
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0.001
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0.0005
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0.0002
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Use of Iron Oxide Pigments
1. In building materials industry, it is mainly used for color cement, color cement floor tiles, color cement tiles, imitation glazed tiles, concrete floor tiles, color mortar, color asphalt, terrazzo, mosaic tiles, artificial marble and wall painting.
2. It can be used for colouring and protecting substances of various coatings, including water-borne interior and exterior wall coatings, powder coatings, etc. It can also be used for various primers and topcoats such as epoxy, alkyd, amino, etc. in oily paints, as well as for toy paints, decorative paints, furniture paints, electrophoretic paints and enamels. Iron red primer has anti-rust function, can replace high-priced red red paint, save non-ferrous metals.
The manufacturer supplies iron oxide red, iron oxide green, iron oxide blue, iron oxide yellow, iron oxide violet, iron oxide brown, iron oxide black and so on. The color is complete, the quantity is large and the discount is favorable. Support mixed batches. Welcome to call for consultation.
1. In building materials industry, it is mainly used for color cement, color cement floor tiles, color cement tiles, imitation glazed tiles, concrete floor tiles, color mortar, color asphalt, terrazzo, mosaic tiles, artificial marble and wall painting.
2. It can be used for colouring and protecting substances of various coatings, including water-borne interior and exterior wall coatings, powder coatings, etc. It can also be used for various primers and topcoats such as epoxy, alkyd, amino, etc. in oily paints, as well as for toy paints, decorative paints, furniture paints, electrophoretic paints and enamels. Iron red primer has anti-rust function, can replace high-priced red red paint, save non-ferrous metals.
The manufacturer supplies iron oxide red, iron oxide green, iron oxide blue, iron oxide yellow, iron oxide violet, iron oxide brown, iron oxide black and so on. The color is complete, the quantity is large and the discount is favorable. Support mixed batches. Welcome to call for consultation.
In addition, graphite is also a polishing agent and antirust agent for glass and paper in light industry, and an indispensable raw material for making pencils, ink, black paint, inks, artificial diamonds and diamonds. It is a good energy-saving and environmental protection material, which has been used as a car battery in the United States. With the development of modern science and technology and industry, the application field of graphite is still expanding. It has become an important raw material of new composite materials in the high-tech field and plays an important role in the national economy.
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