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Polyether ester multi-block copolymerized dihydric alcohol, synthetic method and application of reactive hot melt adhesive

A technology of polyether diol and polyether polyol, applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., can solve the problem of easy blockage of rectification channel and difficulty in obtaining polyether ester copolymer di Alcohol and other issues

Active Publication Date: 2020-11-03
湖南恒旺新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when terephthalic acid is used as a raw material, due to its high dissolution temperature, the required reaction temperature exceeds 240°C, and when DMT is used as a raw material, DMT is easy to sublimate and block the rectification channel.
Moreover, most of such preparation methods can only obtain linear polymers with diblock structures such as PET-PTMG or triblock structures such as PET-PTMG-PET and PTMG-PET-PTMG, and it is difficult to obtain PET-PTMG... Polyetherester Copolymerized Glycol with Multi-block Structure

Method used

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  • Polyether ester multi-block copolymerized dihydric alcohol, synthetic method and application of reactive hot melt adhesive
  • Polyether ester multi-block copolymerized dihydric alcohol, synthetic method and application of reactive hot melt adhesive
  • Polyether ester multi-block copolymerized dihydric alcohol, synthetic method and application of reactive hot melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] According to each raw material and parts by weight described in Example 1 in Table 1, polyethylene terephthalate, small molecule glycol, polyether glycol and alcoholysis catalyst are added in the reactor earlier, and protected under a nitrogen atmosphere After heating up to 190°C for alcoholysis reaction for 1.5h, then add polycondensation catalyst and antioxidant, after heating up to 240°C, first depressurize to -0.04MPa vacuum, after polycondensation for 1h, then depressurize to - Under the vacuum degree of 0.095MPa, carry out the polycondensation reaction for 3 hours, distill out the small molecule diol at the end of the polycondensation product, and cool to obtain the PET / PTMG type polyether ester multi-block copolymerized diol, which is denoted as PET / PTMG1.

[0067] As determined by GPC, the molecular weight of the PET / PTMG type polyether ester multi-block copolymerized diol obtained in the embodiment of the present invention is 4800, and the degree of dispersion i...

Embodiment 2

[0072] According to each raw material and parts by weight described in Example 2 in Table 1, polyethylene terephthalate, small molecule dibasic alcohol, polyether dibasic alcohol and alcoholysis catalyst are added in the reactor earlier, under nitrogen atmosphere protection After the temperature is raised to 185°C for alcoholysis reaction for 2 hours, then polycondensation catalyst and antioxidant are added, after the temperature is raised to 235°C, the pressure is reduced to -0.03MPa vacuum, and after the polycondensation reaction for 1.5h, the pressure is reduced to - Under the vacuum degree of 0.098MPa, carry out the polycondensation reaction for 2.5h, distill out the small molecule diol at the terminal group of the polycondensation product, and cool to obtain PET / PPG type polyether ester multi-block copolymerized diol, denoted as PET / PPG2.

[0073] As determined by GPC, the molecular weight of the PET / PPG type polyether ester multi-block copolymerized glycol obtained in the...

Embodiment 3

[0078] According to each raw material and parts by weight described in Example 3 in Table 1, polyethylene terephthalate, small molecule glycol, polyether glycol and alcoholysis catalyst are added in the reactor earlier, and protected under a nitrogen atmosphere After heating up to 195°C for alcoholysis reaction for 1.5h, then add polycondensation catalyst and antioxidant, after warming up to 245°C, first depressurize to -0.05MPa vacuum degree, after polycondensation reaction for 1h, then depressurize to - Under the vacuum degree of 0.098MPa, carry out the polycondensation reaction for 2.5h, distill out the polycondensation product terminal small molecular diol, cool to obtain PET / PEG type polyether ester multi-block copolymerized diol, denoted as PET / PEG3.

[0079] As determined by GPC, the molecular weight of the PET / PEG polyether ester multi-block copolymerized glycol obtained in the embodiment of the present invention is 3500, and the degree of dispersion is 2.3.

[0080] A...

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Abstract

The invention discloses polyether ester multi-block copolymerized dihydric alcohol, a synthesis method and application of a reactive hot melt adhesive. The polyether ester multi-block copolymerized dihydric alcohol is mainly prepared from the following raw materials: polyethylene glycol terephthalate, small molecular dihydric alcohol, polyether dihydric alcohol, an alcoholysis catalyst, a polycondensation catalyst and an antioxidant. The synthesis method comprises the following steps: adding polyethylene glycol terephthalate, small molecular diol, polyether diol and an alcoholysis catalyst into a reactor, carrying out alcoholysis reaction under the protection of nitrogen, adding a polycondensation catalyst and an antioxidant, heating the reactants, carrying out vacuum polycondensation reaction, and cooling a reaction product. The invention also discloses an application of the polyether ester multi-block copolymerized dihydric alcohol in preparation of the reactive hot melt adhesive. The polyether ester multi-block copolymerized dihydric alcohol has a micro-phase separation structure and-lower and-zero glass transition temperatures, and has good intermiscibility with polyester and polyether polyol. The method is short in reaction time, simple, low in cost and suitable for industrial production. The obtained hot melt adhesive has high initial adhesion and long opening time.

Description

technical field [0001] The invention relates to a copolymerized diol, a synthesis method and its application, in particular to a polyether ester multi-block copolymerized diol, a synthesis method and its application in reactive hot-melt adhesives. Background technique [0002] Reactive polyurethane hot melt adhesive (PUR) has good initial adhesion and fast positioning performance. After sizing, the system undergoes intermolecular crosslinking through moisture curing reaction, which improves the strength, heat resistance, water resistance, and water resistance of the adhesive layer. The chemical properties are stronger than traditional hot-melt adhesives, and it has the advantages of hot-melt adhesives and reactive adhesives. It is a new type of adhesive that is environmentally friendly and has high productivity when used. [0003] The main raw materials for preparing PUR are polyester polyols, polyether polyols and polyisocyanates, but conventional polyester polyols and poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C09J175/04C08G18/76C08G18/48C08G18/42
CPCC08G63/672C08G63/78C09J175/04C08G18/7671C08G18/4018C08G18/4825C08G18/4252C08G18/4202
Inventor 兰支利李皞丹戴尚衡宋腾凌立志
Owner 湖南恒旺新材料科技有限公司
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