Trixene SC7906 Technical Data

Trixene SC 7906

Baxenden Chemicals Limited Speciality Chemicals Division, Paragon Works, Baxenden, Nr Accrington, Lancashire BB5 2SL England Tel: +44 (0) 1254 872278 Fax: +44 (0) 1254 302400

SUPPLEMENTARY TECHNICAL INFORMATION (Supplementary Ref: 9-06)

Product Description

Trixene SC7906 is a urethane bisoxazolidine which can be used in one and two pack light stable polyurethanes. The product allows formulation of high build void free coatings, sealants and Elastomers, which are stable until exposure to moisture. On exposure the product hydrolyses giving four possible sites of reaction. Formulating with different equivalent weights can alter physical properties.

Trixene SC7906 shows good storage stability in sealed containers and is generally insensitive to hydrolysis. The presence of isocyanate prepolymers and moisture causes the hydrolysis reaction speed to increase and further reaction with isocyanates takes place quite rapidly.

Reaction Mechanism for Trixene SC7906

H2C N R1 N CH2 + 2H2O

H2C CH CH CH2 O R2 R2 O

OH C2H4 N R1 N C2H4 OH + 2R2CHO H H

The recommendations made above are general in nature. Although every effort has been made to supply reliable data, it is for informational purposes only. We cannot guarantee the results as stated to be obtained since we have no control over the end use of the material. Each user must make their own tests to determine the suitability of the material for their own use. Nothing contained herein is intended as a recommendation to use our products to infringe any patent. 2

On exposure to water or atmospheric moisture in the presence of an aliphatic isocyanate prepolymer Trixene SC7906 hydrolyses to release two primary hydroxyl and two secondary amine groups. The formulator can alter the properties of the coating or sealant by modifying the amount of Trixene SC7906 in the formulation. Using the equivalent weight 122 will react all four active sites and give higher tensile and tear strength, whereas using the equivalent weight 244 will react the secondary amine sites only. This will result in higher elongation and a reduction in Tensile and tear resistance.

The following table gives some of the typical properties resulting from formulating Trixene SC7906 with some of the aliphatic prepolymers available from Baxenden Chemicals Ltd.

Typical physical properties when reacted with Urethane prepolymers

Prepolymer Property 4 Functional 2 Functional Test method NH/OH NH Trixene SC7940 100% Modulus 3.20 1.02 ASTM D412 (Mpa) Die D 300% Modulus 11.44 1.77 ASTM D412 (Mpa) Die D UTS(Mpa) 18.09 5.75 ASTM D412 Die D Elongation % 329 324 ASTM D412 Die D Graves Tear 25.02 11.87 ASTM D624 Kn/m Die C Trixene SC7931 100% Modulus 1.79 0.61 ASTM D412 (Mpa) Die D 300% Modulus 4.11 0.81 ASTM D412 (Mpa) Die D UTS(Mpa) 13.84 2.40 ASTM D412 Die D Elongation % 393 728 ASTM D412 Die D Graves Tear 19.72 7.71 ASTM D624 Kn/m Die C

Prepolymer Property 4 Functional Test method NH/OH Trixene DP9A/689 100% Modulus 0.63 ASTM D412 (Mpa) Die D 300% Modulus 1.33 ASTM D412 (Mpa) Die D UTS(Mpa) 1.77 ASTM D412 Die D Elongation % 354 ASTM D412 Die D Graves Tear 8.43 ASTM D624 Kn/m Die C Trixene SC7905 100% Modulus 1.93 ASTM D412 (Mpa) Die D 300% Modulus 1.93 ASTM D412 (Mpa) Die D UTS(Mpa) 2.33 ASTM D412 Die D Elongation % 331 ASTM D412 Die D Graves Tear 9.42 ASTM D624 Kn/m Die C

Compatibility

Trixene SC7906 is compatible with most common solvents including Acetates, Ketones, Aldehydes and aromatics. Viscosity can also be modified by using Dioctyl Adipate plasticiser.

When using Trixene SC7906 for one pack systems with isocyanate and prepolymers, solvents containing active hydrogen should be avoided.

When using Trixene SC7906 for 2-pack systems the product is compatible with most commercially available polyols.

Baxenden chemicals Ltd reserve the right to amend or alter specifications as necessary. Please consult the Trixene SC 7906 Safety Data Sheet before using this product.

Revision: 01/09/00