Preparation method of pressure-sensitive adhesive

Pressure-sensitive adhesive is a viscous material that adheres to a variety of surfaces under slight pressure. It is commonly used to make tapes, stickers, labels, and other products. The following is a common preparation method for pressure-sensitive adhesives:

Emulsion Polymerization Method:

Emulsion polymerization is one of the common methods to prepare pressure-sensitive adhesives, and it is suitable for preparing water-based pressure-sensitive adhesives. Here are the basic steps:

  1. Material preparation: Prepare monomer (such as acrylate, butyl acrylate, etc.), crosslinking agent, emulsifier, stabilizer, and other materials.
  2. Emulsification: Mix monomer and water, add emulsifier and stabilizer, and form emulsion under the condition of mechanical stirring. The monomer particles in the emulsion are dispersed in the water.
  3. Polymerization: At the appropriate temperature, through the initiator (such as peroxide) to trigger the polymerization reaction of monomer. These monomer particles are gradually polymerized into polymer chains in the emulsion to form polymer particles.
  4. Crosslinking: Add crosslinking agents to the emulsion to increase the degree of crosslinking of the polymer, thereby improving the viscosity and anti-shear properties of the adhesive.
  5. Adjust the performance: antioxidants, preservatives, etc. can be added as needed to adjust the performance of the adhesive.
  6. Post-treatment: After polymerization is completed, the adhesive particles in the emulsion condense and form colloids by adjusting the pH value and other conditions. This colloid can be used to coat a supporting material to form a pressure-sensitive adhesive product.

Acrylic pressure sensitive adhesive

This is just the basic step of emulsion polymerization. The specific preparation method may vary depending on the material, product needs, and production scale. In addition to emulsion polymerization, there are other methods, such as hot melt and solution polymerization, which can be used to prepare different types of pressure-sensitive adhesives.

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Renewable pressure-sensitive adhesive

A renewable pressure-sensitive adhesive is an adhesive product that can be recycled or degraded after use. These adhesives are usually made from renewable materials or can be recycled and reused after a specific treatment process at the end of their life cycle.

pressure sensitive acrylate adhesive

Here are some possible methods and materials for making renewable pressure-sensitive adhesives:

  1. Bio-based materials: The use of renewable raw materials from plants, microorganisms, or other biological sources to manufacture adhesives. For example, natural polysaccharides such as cellulose and starch can be used to make bio-based pressure-sensitive adhesives.
  2. Degradable materials: Choose degradable materials to make adhesives, which can be broken down into smaller molecules at the end of use and have less impact on the environment. For example, biodegradable plastics such as polylactic acid (PLA) can be used to make adhesives.
  3. Recycling: Design recyclable pressure-sensitive adhesives so that they can be separated and recycled after use through specific treatment steps to be used in the manufacture of new products.
  4. Water-based adhesives: Develop water-based pressure-sensitive adhesives to replace traditional solvent-based adhesives and reduce the impact on the environment. Water-based adhesives typically have low volatile organic compound (VOC) emissions.
  5. Renewable energy: Use renewable energy sources, such as solar or wind power, in the adhesive production process to reduce its overall environmental impact.
  6. Circular economy model: Adopting the concept of circular economy, manufacturers of adhesives are encouraged to consider recycling and reuse at the product design stage to minimize waste generation.

Renewable pressure-sensitive adhesives have been developed to address the negative environmental impact of conventional adhesives. However, this field may be evolving, so I recommend you check out the latest research and technological advances for more accurate and detailed information.

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Curing of adhesives

The curing of adhesives is a process in which curing agents or accelerators play a role, which is usually divided into three kinds: chemical curing, physical curing, and heating curing.

Chemical curing is the process of promoting a curing reaction through a chemical reaction, such as the curing of epoxy adhesives. Its advantages are fast curing speed, and high bonding strength, but poor heat resistance.

Physical curing is the process of promoting the curing reaction through physical action, such as the curing of polyurethane adhesives. Its advantage is better heat resistance, but the curing speed is slow.

pressure sensitive acrylate adhesive

Heat curing is the process of promoting the curing reaction by heating, such as the curing of hot melt adhesives. Its advantage is that the bonding process is simple, but the temperature resistance is poor.

For example, epoxy resin adhesives are a common adhesive whose curing process is facilitated by chemical reactions. When the epoxy resin adhesive is applied on the surface of the object, the epoxy resin and the curing agent react chemically to generate a three-dimensional structure network, so that the adhesive loses its fluidity and achieves permanent bonding. In this process, the role of the curing agent is to provide the active groups required for chemical reactions, such as the addition of an acidic curing agent in epoxy resin, through an acid-base neutralization reaction to generate a three-dimensional structure of the network, to achieve bonding curing.

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Principle of adhesives

The production principle of adhesives is mainly to prepare viscous solutions, emulsions, or suspensions by chemical or physical methods, and then form viscous solids through curing, drying, and other processes.

For example, universal adhesives that are common in daily life are bonded by chemical reactions. When we apply an adhesive to two objects, these adhesive molecules react with molecules on the surface of the object to stick the two objects together. This reaction can be cross-linking, that is, the functional group of one molecule combines with the functional group of another molecule to form a network of three-dimensional structure, so that the fluidity between molecules is lost and permanent bonding is achieved.

principle of adhesives

In addition, some adhesives are bonded by swelling, that is, after the adhesive molecule penetrates the surface of the adhesive, the two objects are bonded together by physical adsorption. This adsorption can be physical adsorption or chemisorption.

In short, the production principle of adhesives can be chemical reaction or physical adsorption, different adhesive production principles are different and need to be selected and designed according to the specific application scenario.

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Technical properties of adhesives

The technical properties of adhesives mainly include viscosity, viscosity, adhesion, and cohesion. Among them, the viscosity is characteristic of the fluidity of the adhesive, which is an important factor affecting the potting and sealing effect.

technical properties of adhesives

The viscosity is characteristic of the fluidity of the adhesive, and it is also an important factor affecting the potting and sealing effect. Adhesion refers to the ability of the adhesive layer to bond with the surface of the adhesive, which is crucial to the bonding strength. Cohesion is the ability of bonding between the various parts of the adhesive layer, which is an important factor affecting the bonding strength.

For example, in electronic adhesives, technical properties such as viscosity, viscosity, adhesion, and cohesion are more stringent. For example, the LED industry of potting adhesives needs to have good low viscosity, fast curing, high-temperature resistance, good electrical properties, and insulation properties; For household glues, it may only be necessary to meet the basic bonding strength and adhesion requirements.

In short, adhesives for different purposes have different technical performance requirements, which need to be selected and designed according to specific application scenarios.

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What are electronic adhesives

Electronic adhesive is a kind of adhesive specially used in the electronics industry, with high insulation, high-temperature resistance, low shrinkage, water resistance, weather resistance, and other characteristics. Compared with other adhesives, electronic adhesives have higher technical requirements and standards and need to be more strictly controlled in terms of bonding strength, temperature resistance, insulation performance, environmental protection performance, etc.

electronic adhesives

Compared with ordinary adhesives, electronic adhesives have the following characteristics:

  1. High-temperature resistance: electronic adhesives need to work at high temperatures, so they need to have good high-temperature resistance.
  2. Bonding strength: electronic adhesives need to have high bonding strength to ensure the stability and reliability of electronic products.
  3. Insulation performance: electronic adhesives need to have good insulation performance to ensure the stability and safety of the internal circuit of electronic products.
  4. Environmental performance: electronic adhesives need to meet environmental requirements and do not contain ingredients harmful to the human body and the environment.
  5. Process performance: electronic adhesives need to have good process performance and be easy to operate and use.

In short, the electronic adhesive is a special adhesive with high technical requirements, which needs to be strictly controlled in terms of technical requirements, standards, environmental protection, etc., to ensure the stability and safety of electronic products.

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Types of electronic adhesives

Electronic adhesives are adhesives specially used in the electronics industry, with high insulation, high-temperature resistance, low shrinkage, water resistance, weather resistance, and other characteristics.

electronic adhesives

The following are several types of electronic adhesives:

  1.  Silicone sealant: Silicone sealant is a commonly used electronic adhesive, with good high-temperature resistance, water resistance, aging resistance, and other properties, widely used in the packaging of electronic products, wire sealing, and so on. Apple’s iPhone, for example, uses silicone sealant to encapsulate its circuit board.
  2. Polyurethane adhesive: Polyurethane adhesive is a high-performance electronic adhesive, with high strength, high elasticity, wear resistance, and other properties, widely used in electronic products bonding, wire fixing, and so on. For example, some high-end cameras, sensors, and other electronic products use polyurethane adhesives to fix their wiring.
  3. Anaerobic sealant: anaerobic sealant is a special electronic adhesive, with good high-temperature resistance, water resistance, aging resistance, and other properties, but in an oxygen-free environment to cure, widely used in electronic product packaging, wire sealing, and so on. For example, the packaging of some electronic components uses anaerobic sealant to protect their internal circuits.
  4. Epoxy resin adhesive: Epoxy resin adhesive is a common electronic adhesive, with good high-temperature resistance, water resistance, aging resistance, and other properties, widely used in electronic products bonding, wire fixing, and so on. For example, some high-end electronics use epoxy adhesives to bond their internal wiring.

In short, there are many types of electronic adhesives, and different types are suitable for different application scenarios, and the appropriate adhesives need to be selected according to the specific needs.

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Development direction of environmental protection adhesive

The development direction of environmental protection adhesive mainly includes the following aspects:

  1. Reduce the use of volatile organic compounds (VOCs): VOCs are one of the common harmful substances in adhesives, so reducing the use of VOCs is an important development direction of environmentally friendly adhesives. For example, water-based adhesives are VOCs-free adhesives that use water as a solvent, reducing the use of VOCs and having less impact on the environment.
  2. Reduce the release of formaldehyde: formaldehyde is a common harmful substance that is harmful to human health. Therefore, reducing the amount of formaldehyde released is an important development direction of environmentally friendly adhesives. For example, some environmentally friendly adhesives use aldehyde-free additive technology, which can effectively reduce the amount of formaldehyde released.
  3. Improve temperature resistance: The automotive industry has high requirements for the temperature resistance of adhesives, so improving the temperature resistance of adhesives is an important development direction of environmentally friendly adhesives. For example, some environmentally friendly adhesives use high-temperature resistant materials that can withstand the use of high-temperature environments.
  4. Reduce costs: The production cost of environmentally friendly adhesives is high, so reducing costs is an important development direction of environmentally friendly adhesives. For example, some environmentally friendly adhesives use new materials and technologies, which can effectively reduce production costs.

environmental protection adhesives

In short, the development direction of environmental protection adhesives mainly includes reducing the use of VOCs, reducing formaldehyde release, improving temperature resistance, and reducing costs. These development directions can effectively improve the quality and performance of adhesives but also have important significance for environmental protection.

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Functional use of water-based adhesive in the automotive field

Water-based adhesives have a wide range of applications in the automotive field, including interior, exterior, wiring harnesses, electronics, seats, lights, tires, Windows, and other fields.

Here are some of its uses and functions:

  1. Interior: Water-based adhesive can be used to bond interior trim parts, such as instrument panels, door interior panels, seats, etc. They have good weather resistance and high-temperature resistance and can be used to produce high-quality interior parts.
  2. Exterior decoration: Water-based adhesive can be used for the bonding of exterior decoration parts, such as lights, bumpers, front and rear bars, etc. They have good corrosion resistance and high-temperature resistance and can be used to produce high-quality exterior parts.
  3. Wiring harness: Water-based adhesive can be used for wiring harness bonding, such as automotive circuit boards, wires, etc. They have good high-temperature resistance and corrosion resistance and can be used to produce high-quality wire harnesses.
  4. Electronic: Water-based adhesives can be used for bonding electronic parts, such as sensors, controllers, etc. They have good high-temperature resistance and corrosion resistance and can be used to produce high-quality electronic components.
  5. Seats: Water-based adhesives can be used for seat bonding, such as seat skeleton, seat fabric, etc. They have good high-temperature resistance and corrosion resistance and can be used to produce high-quality seats.
  6. Tires: Water-based adhesives can be used for tire bonding, such as tire lining, tire outer layer, etc. They have good high-temperature resistance and corrosion resistance and can be used to produce high-quality tires.
  7. Window: Water-based adhesive can be used for the bonding of windows, such as window glass, car window frames, etc. They have good high-temperature resistance and corrosion resistance and can be used to produce high-quality Windows.

water-based adhesive in the automotive field

In short, water-based adhesives have a wide range of applications in the automotive field, which can improve the quality and performance of automobiles, but also has important significance for environmental protection.

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What is water-based adhesive defoamer

A water-based adhesive defoamer is a chemical specifically designed to remove foam from water-based adhesives. Its main features include:

  1. Fast defoaming: Water-based adhesive defoaming agents can eliminate bubbles in the adhesive in a short time, and improve production efficiency and product quality.
  2. Durable: Water-based adhesive defoamer can maintain the defoamer effect for a long time to avoid the regeneration of bubbles.
  3. Chemical stability: Water-based adhesive defoamer has good chemical stability and can withstand a variety of chemical substances and environmental erosion.
  4. Good compatibility: Water-based adhesive defoamer can be well compatible with various types of adhesives without negatively affecting their performance.

water-based adhesive

For example, in paint production, adhesives often introduce a large number of bubbles, which can affect the appearance and performance of the paint. At this time, the water-based adhesive defoamer can effectively eliminate these bubbles and improve the quality and stability of the paint.

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