Xintao, specializing in the production of high-quality molecular sieves!

As Xintao's main product, Xintao molecular sieve powder has many application scenarios. In Xintao's customer case, the activtaed molecular sieve powder water remover for building materials honeycomb panel structural adhesives is also one of the applications. As a new type of chemical material, powdered molecular sieve has strong adsorption and molecular selectivity properties and is mainly used in the production of two-component polyurethane glue and coatings.

This customer case is a company that produces honeycomb panel structural adhesives and needs to use molecular sieves for dehydration and defoaming. Honeycomb panel adhesive is a new type of building material, which is characterized by light weight, high strength, sound insulation, heat insulation, fire protection, etc., so it is widely used in construction projects. In the process of producing honeycomb panel glue, a certain amount of powdered molecular sieve needs to be added to remove moisture and foam.

Aluminum Honeycomb Panel Glue

Two-component polyurethane adhesive is a solvent-free two-component polyurethane adhesive.

The AB components are mixed and solidified in proportion.

They are prepolymers containing a large number of isocyanate groups and polyether polyester polyols.

The reaction is mainly the reaction between isocyanate group and hydroxyl group to produce urethane.

RNCO+Rˊ—OH→RNHCOORˊ

Water Removal and Defoaming

In order to obtain polyurethane adhesives with excellent performance, the moisture in the raw materials must be strictly controlled during the synthesis process.

For removing trace amounts of moisture in solvents, molecular sieve materials have great advantages.

If the polyurethane AB component raw materials contain trace amounts of moisture,

Isocyanate will undergo hydrolysis and polycondensation reaction when it comes into contact with moisture.

It not only affects the polyurethane synthesis reaction, but also produces a large number of dense small bubbles in the material.

NCO + H2O → R-NH2 + CO2↑

2R-NCO + H2O → R-NH-CO-NH-R + CO2↑

Bubble Problem

1. These bubbles formed by gas accumulation inside the material will destroy the continuity of the adhesive and weaken the structural performance.

2. Bubbles will increase the porosity and internal defects of the adhesive, and reduce the mechanical strength and density of the adhesive.

3. Bubbles will roughen the surface of the adhesive and affect the appearance quality.

4. Bubbles reduce the contact area between the adhesive and the substrate and weaken the adhesive force of the adhesive.

5. When there are bubbles, it is difficult to discharge the bubbles when the adhesive solidifies and shrinks, leaving holes and reducing performance.

6. Bubble bursting may also produce stress concentration areas, induce micro-cracks, and reduce the crack resistance of the adhesive.

The trace amount of water in the material may come from the material itself, or it may be absorbed from the humid air.

Therefore, the key to improving the quality of polyurethane glue is to eliminate the trace moisture contained in the raw materials.

Xintao has been cooperating with customers for nearly a year, providing customers with powdered molecular sieves.

Application of Activated Molecular Sieve Powder

Molecular sieve powder is a material with extremely high water absorption accuracy and strong water absorption.

By adding less molecular sieves to the raw materials, the polyurethane raw materials can be completely dehydrated and dried.

This is the main reason why other dry materials cannot be substituted.

Activated Molecular Sieve Powder has strong water absorption, and only a small amount of addition can greatly improve the quality of polyurethane.

The molecular sieve powder produced by Xintao has strong diffusibility and no precipitation, and is extremely pure and free of impurities.

It has been used in the field of polyurethane synthesis for more than 10 years, and the quality is very stable.

Two-component polyurethane adhesive for honeycomb panels is added with Xintao molecular sieve.

It can achieve smoothness without bubbles, no clogging of the gun, no bulges, resistance to climate change, high strength, and most importantly, low cost, high dehydration efficiency, and saving production man-hours.

Activated Molecular Sieve Powder for Structural Adhesives