Сополимер ТДИ-триметилолпропана

Description

TDI-trimethylolpropane copolymer is an adduct of toluene diisocyanate (TDI) with trihydric alcohol trimethylolpropane. The product is obtained by adding three diisocyanate molecules to the three hydroxyl groups of TMP: a star-shaped tri-armed molecule with three free isocyanate (NCO) groups is formed. Such products are classified as aromatic polyisocyanate hardeners. Designations from the card: TT 75, RC 803, Spenkel P 49A6-60, Poluren AD, Coronate L 45E, G 21. A similar type of product on the world market is Desmodur L 75 produced by Covestro with a base substance content of 75%.

Purpose

• hardener (crosslinking agent) of two-component polyurethane paints and varnishes
• component of polyurethane adhesives and sealants
• cross-linking of hydroxyl-containing film-forming resins: polyester, acrylic, alkyd resins

How it works

The free NCO groups of the adduct react with the hydroxyl groups of the base resin, forming urethane bonds. The three-beam structure provides branching of the mesh, so the film is stitched in three dimensions. Hardeners of this type are characterized by rapid hardening, high transparency of the coating, good compatibility with pigments, and at the same time an elastic and durable film. Free isocyanate groups also react with water and air moisture, so the container is kept hermetically sealed.

Basic Attributes

• Chemical formula: (C9H6N2O2, C6H14O3)x
• Product number on card: 2599683; Card synonyms include CAS 9038-58-8, 9040-21-5, 9040-69-1, 39414-51-2, 63705-09-9, 88503-79-1, 211573-57-8
• Molecular Weight: 308.33000
• Exact weight: 308.13700
• EU number: 923-227-5
• PSA Specifications: 119.55000
• XLogP3: 1.28930

GHS classification

• Signal word: Danger
• H315 - Causes skin irritation
• Precautions: P260, P261, P264, P271, P272, P280, P284, P285, P302+P352, P304+P340, P304+P341, P305+P351+P338, P310, P312, P320, P321, P332+P313, P333+P313, P337+P313, P342+P311, P362, P363, P403+P233, P405, P501

Storage and handling

Store in a hermetically sealed container in a dry place: isocyanate groups react with moisture, releasing carbon dioxide and increasing pressure in the closed container. Close the opened container immediately; if possible, store the remainder under dry inert gas. Work should be carried out using local exhaust ventilation, wearing gloves, safety glasses and special clothing; If there is insufficient air exchange, use respiratory protection. Avoid contact with skin - product is classified as irritant. Do not dispose of residues down the drain; transfer waste to a licensed operator.

Catalog section note

In the catalog, the position is classified in the “Alcohols” section based on the alcohol component (trimethylolpropane). Functionally, it is a polyisocyanate: the working groups of the product are NCO groups, not hydroxyl groups.