Technology Category/Market
Chemical Technology- Manufacturing, Advanced Materials, Automates;
Industry- Aerospace; Automotive Industry; Polymer Science,
Applications: joining dissimilar materials like in cars for joining steel frame to glass windshield, and in buses to join the aluminum to steel side skirts, steel to side glass windows, and for bonding the windshields.
Market– The global polyurethane adhesives market was valued at USD 8.1 billion in 2022 and is projected to reach USD 10.3 billion by 2027, growing at a cagr 5.0% from 2022 to 2027
Targeted Industries
Watermarking IP design,
Electronic circuits
Image Gallery
Problem Statement & Unmet Need
- Nowadays adhesive structural bonding has become a bigger alternative to welding and brazing in industries.
- The adhesive should wet the adherents surface before it cures to achieve good adhesion, making accelerated curing with properties necessary to get the desired properties.
- The one component moisture curable adhesives take more time to achieve handling strength due to which longer fixation times are required after the installation for the joints to develop handling strength without slipping.
- By the artificial addition of moisture/hydroxyl groups (or both), the low curing rate is reduced by accelerated curing rate and reduced fixation time significantly.
- Therefore, there is a need for improved cellulosic particle-based one-component polyurethane adhesive wherein the cellulosic particles act as relative fillers and moisture reservoirs for enhancing the curing rate and addressing the mentioned issues.
Technology
Present Patent literature discloses a method for preparing cellulosic particle-based one-component polyurethane adhesive material. The method comprises the steps of:
- Pre-heating one-component polyurethane adhesive (PU) at 80 degree C for 2 to 3 hours.
- Pre-heating the filter material (either Microcrystalline Cellulose (MCC) or Saw Dust (SD)) that acts as a reactive filter and moisture reservoir.
- The filter material is well dispersed in the PU adhesive results in quick consumption of isocyanates, thereby reinforced polyurethane bonded joints showed improved lap-shear strength with little strain reduction.
A graphical representation of the lap shear configuration of the cellulosic particle based one-component polyurethane adhesive is shown in FIG 1, and shapes of microcrystalline cellulose & sawdust powder particles with insets are shown the particle size distribution respectively is shown in FIG 2.
The method for preparing the Cellulosic Particles Based One-component Polyurethane Adhesive PU adhesive is given in the following steps:
- Pre-heating one-component polyurethane adhesive (PU) at 80 degree C for 2-3 hours to facilitate thorough mixing of at least one filler material (MCC and SD).
- Pre-heating the filler material at 80 degree C for 3 hours.
- The one-component polyurethane adhesive (PU) is manually mixed with the filler material (Microcrystalline Cellulose (MCC) and Saw Dust (SD)) for 2 minutes in order obtain enhanced curing rate of moisture curable one-component polyurethane adhesive.
Key Features/Value Proposition
- Polyurethane (PU) adhesives are widely used to join materials that have a high coefficient of thermal expansion mismatches such as dissimilar metals, glass fiber-reinforced plastics (GFRP), and glass panels.
- It has a good load-bearing capacity, design flexibility, uniform stress distribution, and good low-temperature properties. Hence, they are used as both adhesives and sealants.
- The filler material and adhesive material can significantly reduce the overall fabrication time and greatly simplify the shop floor logistics.
Questions about this Technology?
Contact for Licensing
Research lab
Prof. Abhijit P DeshpandeÂ
Dept. of Chemical Engineering
Intellectual Property
- IITM IDF Ref: 1896
- IN Patent No. 399962 (Granted)
Technology Readiness Level
TRL-5Â
Components validation in relevant Environment
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