Talc powder is widely used in different grades of ink products. The product has excellent color performance and can reduce the usage of titanium dioxide. Ultra-fine talcum powder is used in ink products without secondary grinding, which also can improve the friction resistance and fluidity of the ink, while reducing the viscosity.

Product features:

•  Talcum powder has the characteristics of increasing tensile strength, shear strength, flexural strength, compressive strength, reducing deformation, elongation,
• High whiteness, uniform particle size and strong dispersion.
• Our products do not contain asbestos.

Recommended adding amount:

The recommended dosage is for reference only, and the specific dosage will be determined by the customer after the test.

Application:

We will uphold the enterprise spirit of "customer first, pursuit of excellence", adhere to quality first and management and technological innovation, and shoulder the historical responsibility of "new ideas, new opportunities, new challenges" given to us by the times. We have accumulated a lot of resources and worked hard to meet new challenges and develop Xintiandi into a star enterprise with sustainable development and excellent competitiveness.

1.Glue for paper packaging and cardboard: efficient bonding, environmentally friendly and safe

VAE adhesives suitable for cardboard packaging, film-sheet lamination, paper tube/honeycomb sponge molding, as well as envelope making and book binding. This product line has some great technical benefits. It offers strong bonding and good heat resistance for different materials, including engineering plastics like PET and PS. Plus, it cures quickly, which can help boost production efficiency. Its formula system combines diversity and safety. It not only meets the regulatory requirements of food contact materials, but also has excellent spraying suitability, ensuring stable and uniform sizing effects during high-speed production, while keeping the equipment clean and reducing maintenance frequency.

Recommended products:

VINNAPAS EP 706K, EP 707K; VINNAPAS EAF 67, EAF 68

2. Woodworking glue: high strength, low formaldehyde

VAE adhesives are really flexible when it comes to wood processing. They are great for things like furniture, wood floors, plywood, and doors and windows.This adhesive has excellent water resistance and heat resistance, fast curing speed, and adopts innovative DPX technology to achieve a hardener-free formula. At the same time, the formaldehyde content is controlled below 5ppm, effectively solving the yellowing problem. Its excellent overall performance is particularly suitable for impregnated paper or PVC veneer. In addition, VAE adhesives can ensure that the surface of the product reaches a very high degree of flatness, and support the addition of medium to high proportions of PUD (polyurethane dispersion), providing professional and efficient bonding solutions for various wood processing needs.

Recommended products:

EP 706K, EP 707K, VINNAPAS EP 645

3. Textile laminating adhesive: strong and water-resistant, cost-optimized

The application of VAE adhesives in the textile industry covers the efficient lamination of cloth and sponge, artificial leather and PVC veneer, providing a variety of product options, covering a wide range of needs from high viscosity to low viscosity, and can provide high solid content formulas. Its excellent water resistance and excellent wet peel strength ensure a strong and lasting bonding effect.Plus, they require less thickening agent, plasticizer, and solvent, which means you can save on costs. Most importantly, VAE has excellent compatibility with materials such as natural latex, acrylic emulsion, polyurethane emulsion and styrene-butadiene latex, making it more cost-effective in various applications.

Recommended products:

EP 706K, VINNAPAS EP 708, EP 645

4. Tobacco glue: high-speed production, ultra-low residue

VAE emulsions are really useful in the tobacco industry, especially for various types of adhesives like cigarette glues (including overlapping, nozzle, and packaging glues) and special adhesives for fast packaging machines. One of their main benefits is that they have very low levels of formaldehyde (less than 15 ppm) and residual vinyl acetate (under 100 ppm), which meets strict health and safety rules. There’s a full range of formulas available, from low to high viscosity, and they offer options with high solid content to suit different production needs.

Recommended products:

VINNAPAS EP 710, VINNAPAS 756

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WACKER makes VINNAPAS VAE dispersions, which are polymer binders made from vinyl acetate-ethylene (VAE) copolymers. These binders help make many products work better and be more eco-friendly. WACKER is the top producer of VAE dispersions and redispersible polymer powders. You can find their products in lots of areas like coatings, tile adhesives, exterior thermal insulation systems, self-leveling screeds, interior plasters, paper coatings, and adhesives.

What are VAE Copolymer Dispersions?

These copolymers are created by mixing vinyl acetate, a hard monomer, with ethylene, a soft monomer, through emulsion polymerization. The ethylene adds flexibility to the VAE dispersions, so they don’t need extra plasticizers.

Great Rheological Properties

VINNAPAS dispersions that use polyvinyl alcohol (PVOH) are easy to work with for many adhesive tasks, like paper and packaging (VINNAPAS 706 & VINNAPAS 710) . They’re good for different application methods too, such as roller and spray coating(VINNAPAS EP 705 A).

Reduced Migration

The special makeup of the copolymer means that we don't need plasticizers or film-forming agents in products with VAE dispersions. This opens up many options for making low-migration adhesives.

Improved Workability

Dispersions made with surfactants usually have better shear-thinning properties compared to those made with polyvinyl alcohol. This leads to better sticking to plastics, clearer films, more water resistance, and easier spraying, which makes it easier to work with floor adhesives. Plus, they can handle more fillers.

APEO Removal

When making dispersions for adhesives, we don't need to use surfactants with APEOs (alkylphenol ethoxylates). So, VINNAPAS dispersions meet tougher environmental standards (such as VINNAPAS EP 7000).

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Unique Advantages of Aluminum Nitride Ceramics

Compared to conventional alumina (Al₂O₃) ceramics, aluminum nitride (AlN) ceramics offer the following distinctive advantages:

The most significant advantage of AlN is its extremely high thermal conductivity, with a theoretical value reaching 320 W/(m·K), which is 5–10 times that of alumina. This means that under the same operating conditions, AlN ceramics can withstand higher heat flux densities. As a packaging substrate or casing, AlN ceramics are particularly beneficial for heat dissipation in high-power chips or modules. When fabricated into AlN metal-ceramic heating elements (AlN Ceramic Heaters), they enable rapid heating. When made into electrostatic chucks (Electro-Static Chucks), they allow for quick preheating/heating of adsorbed wafers.

AlN has a low coefficient of thermal expansion (CTE) of only 4.3 ppm/K, which is close to that of silicon chips (3.5–4.0 ppm/K). This means there is a natural, high degree of thermal expansion matching between silicon chips and AlN ceramics, inherently improving packaging reliability.

Additionally, AlN ceramics exhibit mechanical properties, electrical performance, and corrosion resistance comparable to those of alumina ceramics.

AlN ceramics combine high thermal conductivity, low thermal expansion, high strength, and chemical corrosion resistance, making them ideal heat dissipation materials, especially for applications in large-scale integrated circuits and high-performance electronic devices.

Factors Affecting the Thermal Conductivity of AlN Ceramics

Since AlN ceramics are insulating solids, the contributions of electron and photon heat transfer are negligible. Their primary heat transfer mechanism is phonon (lattice vibration) conduction. The Al-N bonds in AlN ceramics have high bond energy and short bond lengths, resulting in high phonon propagation speeds, which explains their high thermal conductivity.

Although the theoretical thermal conductivity of AlN can reach 320 W/(m·K), currently only a few companies can produce AlN ceramics with thermal conductivities of up to 230 W/(m·K). Typically, the actual thermal conductivity of commercial products ranges from 150–180 W/(m·K). The factors affecting the thermal conductivity of AlN ceramics are as follows:

From a microscopic perspective, grain boundaries, interfaces, secondary phases, defects, and phonon scattering in the crystal structure all influence phonon transmission. From practical experience, the main factors affecting the thermal conductivity of AlN ceramics include lattice density, oxygen content, raw powder purity, and microstructure.

1、Density

Samples with low density contain numerous pores, which scatter phonons and reduce their mean free path, thereby lowering the thermal conductivity of AlN ceramics. Additionally, low-density samples may fail to meet the mechanical performance requirements for certain applications.

2、Oxygen Content

Due to the strong affinity between AlN and oxygen, the surface of AlN readily oxidizes when exposed to air or moisture, forming an alumina film. This introduces aluminum vacancies and oxygen defects, which can diffuse into the AlN lattice during sintering. Once these defects spread throughout the AlN crystal network, the mean free path of phonons is reduced, leading to a decline in thermal conductivity.

3、Lattice Defects

Research has found that the types of defects in AlN (aluminum nitride ceramic) lattices are related to oxygen atom concentration.

When the oxygen concentration is below 0.75%, oxygen atoms are uniformly dispersed in the AlN lattice, substituting nitrogen atoms and generating aluminum vacancies.

When the oxygen concentration is 0.75% or higher, the positions of aluminum atoms in the AlN lattice shift, eliminating aluminum vacancies and creating octahedral defects.

At higher oxygen concentrations, the lattice develops extended defects such as polytypes, inversion domains, and oxygen-containing stacking faults.

Measures to Improve the Thermal Conductivity of AlN Ceramics

1、Increase Density

Use fine-grained, highly sinterable micro/nano powders, incorporate sintering aids, or employ high-energy physical-assisted sintering methods to enhance the sintered density of the ceramics.

2、Reduce Oxygen Content and Internal Defects

Select high-purity, low-oxygen raw powders. Ensure that the storage of raw powders and the forming of semi-finished products avoid moisture exposure. Strictly control oxygen levels during atmosphere sintering.

About Xiamen Juci Technology

Xiamen Juci Technology is the leading AlN powder and AlN ceramics manufacture in China. Our products feature excellent thermal conductivity, electrical insulation, and mechanical strength, widely used in electronic packaging, semiconductors, LED heat dissipation, and other fields. With advanced manufacturing processes and strict quality control, we provide high-reliability AlN substrates, structural components, and tailored solutions to support advanced manufacturing industries.

Media Contact:
Xiamen Juci Technology Co., Ltd.

Phone: +86 592 7080230
Email: miki_huang@chinajuci.com

Website: www.jucialnglobal.com

Butvar brand resins generally are soluble in alcohols, glycol ethers, and certain mixtures of polar and nonpolar solvents. In general, Butvar B-98 (PVB Resin B-05SY) resin will show the same general compatibility characteristics as Butvar B-90 (PVB Resin B-02HX) and, therefore, should prove advantageous where physical and chemical properties of B-90 are desired but lower solution viscosities are necessary. The same is true for Butvar B-79 in relation to Butvar B-76.

The lower hydroxyl content of Butvar B-76 and Butvar B-79 permits solubility in a wider variety of organic solvents as compared to the other grades of Butvar. One notable exception, however, is the insolubility of Butvar B-76 and Butvar B-79 in methanol. All other types of Butvar contain sufficient hydroxyl groups to allow for solubility in alcohol and in hydroxyl-containing solvents. The presence of both butyral and hydroxyl groups permits solution in mixtures of alcohol and aromatics. Viscosities of Butvar resin solutions containing mixed solvents depend on the ratio of alcohol to aromatic. Viscosity curves for Butvar B-76, Butvar B-90, and Butvar B-98 in Graph 2 show minimum points in the general vicinity of 50% alcohol: 50% aromatic.

A common solvent for all of the Butvar resins is a combination of 60 parts toluene and 40 parts ethanol (95%) by weight. For compositions of Butvar, methyl alcohol will tend to give the lowest viscosity and, therefore, will permit the use of higher solids when used as a component of a solvent blend. When much more than 10% to 15% alcohol is used in a formulation for spray application, blushing may result. They are useful as starting points in the development of solvent blends for the other types.

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The scientific name of PVB resin is polyvinyl butyral resin. It was successfully industrialized in the United States in the 1930s and has a history of more than 70 years. my country has been trying to industrialize it since the 1960s, but due to the sensitivity of raw materials and process parameters, the product quality fluctuates greatly. The few finished products can only meet military purposes. It was not until the 1990s that a small amount of PVB (B-06HX &PVB B-20HX) products entered the civilian market.

Due to the different processes of PVB manufacturers, the requirements for PVB quality indicators are also different. Not only are there certain restrictions on the viscosity range, but there are also clear requirements for many indicators such as acetalization degree, tensile strength, and film-forming properties. Therefore, it is very easy to make PVB resin. However, it is quite difficult to make products that satisfy users. In order to produce PVB resins that meet user needs and improve the qualified rate of products, the following countermeasures should be taken:

Carefully select raw materials PVA

PVA has a variety of models (such as PVA 088-50 & PVA 2488, Mowiol 47-88), not only with different degrees of polymerization, but also with different degrees of alcoholysis. To figure out how much acetalization you need, pick a PVA that meets the viscosity requirements. Try to keep the process conditions the same so that the product quality stays good without putting in extra effort.

Process control programming

At present, the production of China PVB resin adopts two-step precipitation method, kettle operation, and intermittent production. The production control is mainly manual control, which is quite arbitrary, especially the viscosity of PVB. The viscosity changes greatly with a slight change in the process.It's a good idea to use a DCS control system for making PVB resin. Stick to a programmed operation and keep the process steps pretty much the same for each customer.

Strict finished product management

It is best to adopt order-based production, and deliver it to customers in time after production is completed. Products that have not been delivered to customers must be placed separately and must not be mixed. For products that have been parked in the warehouse for more than one month, re-sampling and analysis are required before leaving the factory to prevent degradation of PVB resin powder.

Disposal of unqualified products

Some products may not meet the requirements of a certain user for individual indicators, but there is no problem with the quality of the batch of products itself. The usual practice is to find users with the same or similar quality as the batch of products and make appropriate treatments based on the degree of compliance. If the same products can be sent directly to the user, if the same products are not met, measures such as return package and add can be taken. Products with quality problems can only be sold as waste or destroyed.

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The different kinds of Butvar resins have their properties laid out in Tables 1 to 5. These resins come in various molecular weights and viscosities. Butvar 76 and Butvar 79 resins have less hydroxyl content compared to other Butvar options, which gives them better solubility.

Generally, when you swap butyral groups for acetate groups, you get a polymer that repels water better and can handle heat more without deforming. This change also boosts the polymer's strength and how well it sticks to different surfaces. The strong sticking power of polyvinyl butyral resins comes from their terpolymer structure. Since each molecule has a choice of three different functional groups on its surface, the likelihood of adhesion to a wide range of substrates is significantly increased.

Although polyvinyl butyral resins (PVB) are generally thermoplastic and soluble in a number of solvents, they can be crosslinked by heat and small amounts of mineral acid.Crosslinking often happens through transacetalization, but it can also be due to more complicated processes, like reactions between acetate or hydroxyl groups on nearby chains.

In practice, crosslinking of polyvinyl butyrals is achieved by reaction with various thermosetting resins such as phenolic, epoxy, urea, dicyanate, and melamine resins. The availability of functional hydroxyl groups in Butvar resins for this type of condensation is an important factor in many applications. Including even a small amount of Butvar resin in thermosetting compositions will significantly improve the strength, flexibility, and adhesion of the cured coating.

Polyvinyl butyral films are known for their great resistance to various substances like aliphatic hydrocarbons and different kinds of oils, except for castor and gypsum oils. They tolerate strong bases, but are sensitive to strong acids. However, when used as components of cured coatings, their resistance to acids, solvents and other chemicals is greatly increased. Butyral withstands temperatures up to 200°F for long periods with little color change.

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