A kind of polyester polyol, preparation method and application
A polyester polyol and polyol technology, which is applied in the field of polyurethane materials, can solve the problems of increasing the difficulty of synthesis process control, long synthesis steps, product flexibility, low temperature resistance and poor mechanical properties, and achieves convenient and efficient synthesis routes. , Improve the hardness, the effect of simple synthesis method
Active Publication Date: 2022-04-19
WANHUA CHEM GRP CO LTD
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Problems solved by technology
As the amount of reactive diluent monomer increases, although the curing rate of the system increases, the flexibility, low temperature resistance and mechanical properties of the product deteriorate, which is not conducive to the advantages of polyurethane acrylic acid; Synthesis and acrylate monomer end-capping two-step reaction to synthesize photocurable resin, the synthesis steps are longer, which increases the difficulty of synthesis process control
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Embodiment 1-12
[0052] A kind of preparation method of polyester polyol, the raw material that adopts and proportioning reference table 1;
[0053] The overall preparation process is: in a 5L stainless steel reaction kettle equipped with heating jacket, stirring, nitrogen stripping, rectification tower, vacuum gauge, and alcohol recovery tank, according to Table 1, components A, B, C and polymerization inhibition agent. Heat up to 145°C to melt and start the reaction. As the reaction progresses, the by-product water is continuously separated from the system, and the reaction stage lasts for 1 hour. Subsequently, the temperature was further raised to 250° C. for 3 hours. After 1 hour of heat preservation at 250°C, the reaction water gradually slowed down. At this time, tetra-n-butyl titanate was added, and the vacuum degree was increased to 0.09MPa within 1 hour to continue the reaction. The reaction stops when the value reaches the set value. Cool down to 150°C, discharge and pack. The ob...
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Abstract
The invention discloses a polyester polyol, a preparation method and an application. Polyester polyol is prepared by polycondensation reaction of the following components by mass: A) dibasic acid or its derivatives, 100 parts; B) polyol containing double bonds, 50-500 parts; C) no double bond Bonded small molecule glycol, 0‑200 parts. The preparation method of polyester polyol is prepared by conventional condensation reaction. The invention also provides an application of polyester polyol in preparing photocurable polyurethane resin. The technical advantage of the present invention is: polyester polyol has higher double bond content, not only can improve the various performances of light-cured polyurethane resin, and can reduce the consumption of active monomer acrylate or avoid adding to Acrylate is added to the resin system to reduce the influence of acrylate on resin performance.
Description
technical field [0001] The invention relates to a polyester polyol, in particular to a polyester polyol, a preparation method and application, and belongs to the technical field of polyurethane materials. Background technique [0002] Urethane acrylate is an important class of photocurable cross-linked polyurethane resin. It is based on polyurethane, and the end of the molecular chain introduces double bonds through acrylation. bond crosslinking reaction. Its molecular structure mainly includes a urethane segment, a polyol main chain, and an acrylate hydroxyalkyl ester segment, and the curing characteristics are determined by the acrylate located in the segment. Urethane acrylates combine the advantages of both acrylic and polyurethane resins. [0003] The polymerizable double bonds of urethane acrylate oligomers are generally located at the end of the molecular chain. In order to increase the double bond content of photocurable urethane acrylate, improve the curing rate a...
Claims
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IPC IPC(8): C08G63/52C08G18/68
CPCC08G63/52C08G18/68
Inventor孙令民张存玉黄岐善
OwnerWANHUA CHEM GRP CO LTD