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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Heat-resistant ultra-low stripping force protective film

The heat-resistant ultra-low stripping force protective film is a high-performance packaging material for electronic devices with the following characteristics:

stripping force protective film

  1. Ultra-low stripping force: the protective film can maintain ultra-low stripping force under high-temperature conditions, reducing the damage when the component is separated.
  2. High heat resistance: the protective film has good thermal stability under high-temperature conditions and can withstand oxidation and aging process under high-temperature environments.
  3. Excellent electrical performance: The protective film has excellent electrical properties, such as high insulation resistance, low dielectric constant, etc., which can ensure the normal operation of electronic devices.
  4. Good chemical resistance: the protective film can withstand the corrosion of a variety of chemicals and solvents, and can maintain its stable performance for a long time.

For example, in the production of electronic devices, protective films are widely used in chip packaging, lead welding, circuit board assembly, and other links. Ultra-low stripping force ensures stability when components are separated, while high heat resistance and good electrical performance guarantee high performance and reliability of electronic devices.

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Adhesion characteristics of pressure-sensitive adhesive

The adhesion characteristics of pressure-sensitive adhesive refer to the fact that the pressure-sensitive adhesive can firmly adhere to the surface of the object when it contacts the surface of the object and can form a uniform bonding layer under the action of a certain external force.

This property allows pressure-sensitive adhesives to be widely used in various fields, such as packaging, labeling, electronics, automotive, construction, etc.

pressure-sensitive adhesive

The adhesion characteristics of pressure-sensitive adhesive mainly include adhesion force, adhesion range, and adhesion stability. Among them, the adhesive force refers to the adhesive force produced by the pressure-sensitive adhesive when it contacts the surface of the object; The adhesion range refers to the surface range of the object that the pressure-sensitive adhesive can adhere to; Adhesion stability refers to the ability of pressure sensitive adhesives to maintain stable adhesion during long-term use.

For example, the sticky notes we use in daily life use the adhesive properties of pressure-sensitive adhesive to achieve the function of paste. In the manufacturing process of Post-it notes, it is necessary to use a special pressure-sensitive adhesive, which can create a strong adhesion when it contacts the surface of the object so that the Post-it note will not leave a residue after being torn off. In addition, pressure-sensitive adhesives can also be widely used in construction, electronics, automotive and other industrial fields, for the manufacture of labels, tapes, sealants, and other products.

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The role of pressure-sensitive adhesive defoamer

Pressure-sensitive adhesive defoamer is an additive that can eliminate the bubbles produced during the production and use of pressure-sensitive adhesives. Its role mainly has the following points:

pressure-sensitive adhesive defoamer

  1. Eliminate the bubbles produced by the pressure-sensitive adhesive in the process of stirring, mixing, coating, etc.
  2. Prevent bubbles from bursting before the pressure-sensitive adhesive dries or cures, to avoid the impact of bubbles on product quality.
  3. Reduce the impact of bubbles on the adhesion of pressure-sensitive adhesives and improve the adhesion of pressure-sensitive adhesives.

For example, if you find bubbles on the surface of the product when you use pressure-sensitive adhesive for label production, you can consider adding a pressure-sensitive adhesive defoamer. After adding an appropriate amount of pressure-sensitive adhesive defoamer, these bubbles can be eliminated, thereby improving the appearance and quality of the product.

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The role of pressure-sensitive adhesive thickener

Pressure-sensitive adhesive thickener is a kind of auxiliary agent which can increase the viscosity, rheology, and thixotropy of pressure-sensitive adhesive. Its role mainly has the following points:

  1. Improve the viscosity of the pressure-sensitive adhesive, so that it can better adhere to the surface of the object.
  2. Increase the thixotropy of the pressure-sensitive adhesive, so that it can be better distributed on the surface of the object, thereby improving the adhesive force.
  3. Improve the fluidity of the pressure-sensitive adhesive, so that it can better flow to the concave and convex parts of the surface of the object.

pressure-sensitive adhesive thickener

For example, if you find that the adhesive force is not strong enough when using pressure-sensitive adhesive for label production, you can consider adding a pressure-sensitive adhesive thickener. After adding the right amount of pressure-sensitive adhesive thickener, the viscosity of pressure-sensitive adhesive can be increased, and its thixotropy can be improved, to enhance the adhesive force.

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Testing standards for pressure-sensitive tape

The testing standards of pressure-sensitive tape include but are not limited to the following aspects:

pressure-sensitive tape

  1. The pressure-sensitive tape stripping test is mainly to test the separation degree of the pressure-sensitive tape and the adhesive surface under the unit area, unit stripping speed, and unit pulling force. Its test instruments are universal tensile testing machines and stripping testing machines, and the test standard is “GB/T 3364-2017 Stripping test of pressure sensitive tape and adhesive”.
  2. The adhesive test of pressure-sensitive tape is mainly to test the adhesive property of pressure-sensitive tape. Its test instruments are universal tensile testing machines and stripping testing machines, and the test standard is “GB/T 3364-2017 Stripping test of pressure sensitive tape and adhesive”.
  3. The initial viscosity test of pressure-sensitive tape mainly tests the adhesion of pressure-sensitive adhesive when it is just produced. The test instrument is a rotary roller, and the test standard is “GB/T 4857.8-2000 pressure sensitive adhesive label”.
  4. Pressure-sensitive tape high-temperature test mainly tests the performance of pressure-sensitive adhesive in high-temperature environments. The test instrument is a high-temperature testing machine, and the test standard is “GB/T 5579.15-2006 pressure sensitive rubber products high-temperature test method”.
  5. The initial viscosity test of pressure-sensitive tape mainly tests the adhesion of pressure-sensitive adhesive when it is just produced. The test instrument is a flat tensile testing machine, and the test standard is “GB/T 27911-2011”.

For example, if you need to test the resistance of a pressure-sensitive tape to high temperatures, you can use a high-temperature testing machine. During the test, the pressure-sensitive tape can be placed in a high-temperature testing machine, and then the temperature is gradually increased to observe whether the performance of the pressure-sensitive tape changes. If the temperature rises to a certain extent, the adhesive property of the pressure sensitive tape changes, then this pressure-sensitive has the high temperature resistance index of the press high-temperature tape.

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The properties of acrylic pressure-sensitive adhesive

The acrylic pressure-sensitive adhesive has the characteristics of good initial viscosity, high bond strength, water resistance, heat resistance, cold resistance, oil resistance, medium corrosion resistance, fast curing speed, stable storage, and non-toxic and pollution-free.

In addition, acrylic pressure-sensitive adhesive can also be mixed with other binders such as natural rubber, neoprene rubber, nitrile rubber, etc., to adapt to different bonding needs.

acrylic pressure-sensitive adhesive

With acrylic pressure-sensitive adhesive as the main raw material, it can also make pressure-sensitive tape, double-sided tape, high-temperature tape, electronic tape, kraft paper tape, fiber tape, PVC, PP, kraft paper, cloth, and other base materials. For example, double-sided tape is made of pressure-sensitive adhesive, an adhesive material that does not need to be diluted and can be applied directly.

It should be noted that because acrylic pressure-sensitive adhesive does not contain solvent, environmental protection and initial adhesion and bond strength are better, but the price is higher. Select this option based on actual application scenarios and requirements.

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What are the traditional pressure-sensitive adhesives

Traditional pressure-sensitive adhesives include solvent-based pressure-sensitive adhesives, water-based pressure-sensitive adhesives, emulsion pressure-sensitive adhesives, and reactive pressure-sensitive adhesives.

  1. 1. Solvent-based pressure-sensitive adhesive: This adhesive has high bond strength and is suitable for a variety of different pressure-sensitive substrates, but it is not environmentally friendly and easy to pollute the environment. For example, polypropylene pressure-sensitive adhesive, polyurethane pressure-sensitive adhesive, neoprene pressure-sensitive adhesive, and so on.
  2. Water-based pressure-sensitive adhesive: This adhesive is safe and non-toxic, and has little impact on the environment, but the initial adhesion is poor. For example, natural rubber pressure-sensitive adhesive, neoprene rubber pressure-sensitive adhesive, acrylate pressure-sensitive adhesive, and so on.
  3. Emulsion pressure sensitive adhesive: This adhesive is green and environmentally friendly, but water resistance and thermal stability may be poor. For example, polypropylene pressure-sensitive adhesive, polyurethane pressure-sensitive adhesive, styrene-butadiene rubber pressure-sensitive adhesive, and so on.
  4. Reactive pressure sensitive adhesive: This adhesive does not contain solvents, environmental protection and initial adhesion and bond strength is good, but the price is higher. For example, acrylic pressure-sensitive adhesive, polyurethane pressure-sensitive adhesive, epoxy resin pressure-sensitive adhesive, and so on.

Traditional pressure-sensitive adhesives

The pressure-sensitive adhesives listed above are for reference only, and the specific choice of pressure-sensitive adhesives should be determined according to the actual application scenario and needs.

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Flatness of pressure-sensitive adhesive

The flatness of pressure-sensitive adhesive means that the pressure-sensitive adhesive tape has good adaptability to the glued surface during the pasting process, and does not produce obvious shrinkage, distortion, or deformation. Flatness is one of the important indexes to evaluate the quality of pressure-sensitive tape.

flatness of pressure-sensitive adhesive

For example, if the surface of the pressure-sensitive tape is not smooth enough, the following problems may occur:

  1. Decrease in adhesive force: If the surface of the pressure-sensitive tape is uneven, the contact area between the adhesive surface and the adhesive layer will become smaller, thereby reducing the adhesive force.
  2. Shrinkage deformation: If the surface of the pressure-sensitive tape is not smooth, there may be shrinkage deformation after pasting, resulting in wrinkles or bumps on the surface of the pasted object.
  3. Reduced durability: If the surface of the pressure-sensitive tape is uneven, it may crack and flake during long-term use, thereby reducing the durability of the tape.

Therefore, flatness is one of the important indicators of the quality of pressure-sensitive tape, manufacturers usually improve the flatness of pressure-sensitive tape by controlling the quality of raw materials, production process, and other factors. When consumers choose pressure-sensitive tape, they can also judge its flatness by observing the surface quality of the product.

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Test method of pressure-sensitive adhesive

The test method of pressure-sensitive adhesive consists of the following steps:

pressure-sensitive adhesive

  1. Prepare 100mL, 10% trimeric anhydride trihydroxy resin sample solution.
  2. Use a clean rubber scraper to remove oil from the adhesive surface of the adhesive tape. Wipe with alcohol or ethanol 10 times and dry the adhesive surface with a hair dryer.
  3. The tape is taken from a domestic production line, and the standard experimental adhesive is 100% methacrylate pressure-sensitive adhesive from domestic mainstream manufacturers.
  4. Hang the tape at 0.5m on the horizontal plane to make it droop naturally and avoid the glue facing down. Fix a 1.5m×1m steel plate or board on the top of the rubber side 0.5m away from the tape, and apply a small amount of primer to the surface of the steel plate or board.
  5. The prepared sample is naturally pasted on the steel plate or board coated with primer according to the width of the tape, and a 50mm thick polyethylene foam block is added between the tape and the steel plate or board to make the sample pasted tightly.
  6. Prepare 0.2mol/L sodium hydroxide solution by dipping method, and place the sample on the center line of the tape so that the sample is equal to the container containing the solution. Remove the excess solution from the surface of the tape with absorbent cotton or a clean squeezer.
  7. Weigh the 0.2g gelatin sample, prepare 100mL solution with 0.9% sodium hydroxide solution, and put it in a volumetric bottle. Take 25mL gelatin solution into 250mL beaker, add 100mL water, heat to about 80℃, stir while adding 25mL 0.2mol/L sodium hydroxide solution drop by drop, adjust the temperature to about 80℃, continue stirring until the gelatin is completely dissolved.
  8. Under strong stirring, slowly pour the sodium hydroxide solution into the gelatin solution, and adjust the total volume to 40mL with 30% sodium hydroxide solution. Under strong stirring, add 4mL of n-butanol solution and stir strongly to mix well.
  9. Use hydrochloric acid standard titration solution to titrate the above mixture. When the color of the mixture changes, use a titration liquid drop to settle to the endpoint. Note the volume of the standard titration solution of hydrochloric acid consumed.
  10. Repeat steps 7-9 to record the volume of hydrochloric acid standard titration solution consumed by three concentrations (2.5g/L, 5g/L, 10g/L) of gelatin solution.

Through the above steps, the test results of pressure-sensitive adhesive can be obtained.

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