AB Glue Defoaming Solutions

Solve bubble challenges during mixing and stirring of A/B two-component materials, full coverage from epoxy to acrylic structural adhesives


AB glue (Two-Component Adhesive) is a two-component reactive adhesive material composed of Component A (resin matrix) and Component B (curing agent). It is mixed in a specific ratio and cures chemically at room temperature or with heating. Widely used in automotive, wind power, electronic potting, building reinforcement, aerospace and other fields requiring high structural strength. Air is easily entrapped when mixing A and B components. In addition, heat released during curing accelerates bubble expansion. Residual bubbles will seriously reduce structural strength, fatigue life and curing uniformity. SIENOX provides complete solutions from proportioning, mixing to defoaming and discharging for various AB adhesives through self-developed planetary mixing and defoaming technology.


◆ Material Characteristics

Common Matrix Types

Epoxy resin, polyurethane, methyl methacrylate (MMA)

Curing Agent Types

Modified amine, acid anhydride, thiol, peroxide initiator

Mixing Ratio

1:1 / 2:1 / 4:1 / 10:1 (volume or weight ratio)

Viscosity Range After Mixing

200~80,000 cps

Curing Method

Room-temperature curing / Heat curing (60~150℃)

Typical Application Scenarios

Automotive structural parts, wind turbine blades, electronic potting, building reinforcement


◆ Mature Application Fields

AB glue is widely adopted in high-strength structural bonding scenarios including automotive, wind power, electronics and construction. Main application fields and typical working conditions are shown below:


🚗 Automotive Body & Lightweighting

Structural bonding of carbon fiber/aluminum alloy and steel car body. Epoxy or acrylic AB glue is commonly used, requiring high strength, impact resistance and resistance to high-low temperature cycles

🌬️ Wind Turbine Blades & Composites

Structural bonding of blade shell, web and spar cap. Epoxy or polyurethane AB glue is commonly used, suitable for large-area coating with high strength and fatigue resistance

⚡ Electronic Potting & Protection

Epoxy AB potting for power modules, transformers and sensors. High insulation, thermal conductivity, moisture resistance and zero residual bubbles are required

🏗️ Building Strengthening & Structural Reinforcement

Structural reinforcement bonding between carbon fiber cloth and concrete. Epoxy AB glue is commonly used, featuring high thixotropy, high strength and aging resistance

🔧 Furniture & Building Material Assembly

Dissimilar material bonding of metal, wood, stone and ceramic. Acrylic AB glue is commonly used for fast positioning, eco-friendliness and low odor

🚄 Rail Transit

Structural bonding of carriage interior panels, floors and equipment brackets. Epoxy or polyurethane AB glue is commonly used with high strength, flame retardancy and vibration resistance

✈️ Aerospace

Epoxy AB adhesive bonding for aerospace composite parts and honeycomb sandwich panels. High temperature resistance, high strength and aerospace certification are required

🚢 Shipbuilding

Structural bonding of FRP hull, deck and bulkhead. Epoxy or vinyl ester AB glue is commonly used with water resistance, corrosion resistance and high strength

🏋️ Sports Equipment

Structural bonding for carbon fiber bicycles, tennis rackets, snowboards and other composite products. Epoxy AB glue is commonly used for lightweight and high strength


◆ Core Problems Caused by Bubbles

💪 Reduced Structural Strength

Bubbles occupy effective bonding cross-section and form stress concentration points, greatly reducing tensile strength, shear strength and impact strength. Cracks tend to initiate at bubbles under load.

⚗️ Uneven Curing

Bubble zones hinder full contact between A/B components, leading to insufficient local curing agent, incomplete curing, sticky surface and fluctuating mechanical properties.

🔌 Failed Potting Protection

Bubbles in electronic potting compounds form penetration channels for moisture, lowering insulation resistance and dielectric strength. Moisture ingress causes component corrosion or short circuit.

⏱️ Shortened Fatigue Life

Bubbles act as crack initiation points under dynamic load and significantly shorten fatigue life, which is critical for wind turbine blades, automotive chassis and other alternating stress applications.


◆ Recommended Process — Planetary Mixing & Defoaming

Planetary mixing defoaming is the core process to solve bubble issues of AB glue. Through planetary motion with rotation and revolution, uniform mixing of A/B components and high-efficiency defoaming are realized simultaneously.


Step 1  Pretreatment of Component A

Fully stir component A (resin) to eliminate filler sedimentation and stratification after long-term storage and restore uniformity

Step 2  Proportioning & Mixing

Accurately weigh A/B components according to manufacturer’s specified ratio (error ≤ ±2%) and add into the same mixing cup

Step 3  Mixing & Defoaming

Planetary motion completes mixing and defoaming synchronously. Vacuum assistance (-95KPa) can be added for medium & high viscosity materials to boost efficiency

Step 4  Discharging & Application

Complete coating / potting within pot life immediately after defoaming to avoid viscosity rise caused by timeout


◆ Recommended Equipment

  1. MIX60 — Suitable for low-viscosity AB glue, viscosity ≤5,000 cps. Laboratory / small-batch use. Planetary rotation & revolution, simple operation, fast cleaning, optional vacuum module.

  2. MIX90 — Suitable for medium-viscosity AB glue, viscosity 5,000~30,000 cps. General-purpose model covering mainstream epoxy and acrylic AB adhesives. Balanced mixing & defoaming efficiency, optional vacuum (-95KPa), suitable for small & medium batch production lines.

  3. MIX1000PLUS — For high viscosity and high throughput, viscosity 15,000~80,000 cps. Production-grade mixing defoamer, large capacity, outstanding efficiency, continuous industrial operation with standard vacuum module.

  4. MIX2000 — For mass production scenarios with high capacity demand. Large-capacity industrial defoaming machine, stable operation, easy maintenance for long continuous running, standard vacuum module.


◆ Test Cases

The following are measured defoaming cases of AB glue with different viscosity ranges to verify the applicability of planetary mixing defoaming process for various AB glue scenarios.


▶ Case 1: Low-viscosity Epoxy AB Glue

Item

Parameters

Test Material

Two-component epoxy AB glue (A: Bisphenol A epoxy resin, B: modified aliphatic amine curing agent, A:B=3:1)

Viscosity After Mixing

Approx. 2,000 cps

Test Model

MIX60

Vacuum Degree

-95 KPa

Rotation Speed

2,000 rpm

Time

3 min

Temperature

Ambient (25℃)

✅ Defoaming Result: Mixing and defoaming completed synchronously. A/B components are mixed uniformly without color difference. Bubbles are fully removed and the glue remains clear and transparent. Cured mechanical properties meet standards, suitable for electronic potting and thin-layer coating.


▶ Case 2: Medium-viscosity Acrylic Structural AB Glue

Item

Parameters

Test Material

Two-component MMA structural AB glue (A:B=10:1, with toughener)

Viscosity After Mixing

Approx. 12,000 cps

Test Model

MIX90

Vacuum Degree

-95 KPa

Rotation Speed

2,000 rpm

Time

5 min

Temperature

Ambient (25℃)

✅ Defoaming Result: Uniform mixing of A/B components and good dispersion of toughener. Bubbles are thoroughly removed. The glue is fine and particle-free. Cured shear strength and impact strength meet standards, suitable for automotive structural parts and composite bonding.


▶ Case 3: High-viscosity Epoxy Potting AB Glue

Item

Parameters

Test Material

High-filled two-component epoxy potting compound (A: epoxy + alumina/aluminum hydroxide filler, B: modified anhydride curing agent, A:B=5:1)

Viscosity After Mixing

Approx. 45,000 cps

Test Model

MIX1000PLUS

Vacuum Degree

-95 KPa

Rotation Speed

1,800 rpm

Time

8 min

Temperature

Ambient (25℃)

✅ Defoaming Result: Bubble removal rate >98% for high-viscosity paste. A/B components and high-fill fillers are fully mixed. The cured compound is dense without voids, sedimentation or delamination. Cured dielectric strength and thermal conductivity meet requirements, suitable for power module and transformer potting.


◆ Before & After Comparison

Comparison Item

Before Defoaming

After Defoaming

Structural Strength

Bubbles reduce effective cross-section, strength drops by 20%~40%

Dense glue, shear strength fully compliant

Curing Uniformity

Incomplete curing and sticky surface at bubble areas

Uniform A/B mixing, consistent full curing

Fatigue Life

Cracks easily initiate at bubbles, fatigue life greatly reduced

Defect-free glue, significantly extended fatigue life

Potting Protection

Bubble channels allow moisture penetration and insulation failure

Dense potting with reliable insulation & moisture resistance

Batch Consistency

Unstable manual mixing with large fluctuation in bubble rate

Reproducible parameters and stable batch consistency

Production Efficiency

Two separate steps for mixing + defoaming, long time consumption and wasted pot life

One-step mixing & defoaming, doubled productivity


🎯 Free Sample Testing
Send us your AB glue samples, we will test defoaming parameters and issue test reports