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Process for producing a polyurethane composition

A polyurethane and composition technology, which is applied in the field of polyurethane composition production, can solve the problems of high maintenance cost and expensive requirements for dynamic mixers, etc.

Pending Publication Date: 2021-07-23
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dynamic mixers require expensive moving parts and have high maintenance costs

Method used

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  • Process for producing a polyurethane composition
  • Process for producing a polyurethane composition
  • Process for producing a polyurethane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0449] Preparation of Polyurethane Compositions Without Thinners

[0450] 6 kg of PEG 8000 were gradually introduced into the preheated reaction vessel. The heating jacket temperature was set to 110°C. The stirrer was set to a value of 20-30 revolutions per minute (rpm). After the PEG 8000 had completely melted, a nitrogen flow of 600 l / h was blown in for at least 24 hours until the water content was below 200 ppm. The vessel was maintained at 100°C and the nitrogen flow was limited to 400 l / h.

[0451] First preheat the feed conduit, stirred autoclave (R100), static premixer R', reactors (R1-R5) and discharge equipment for at least 1 hour. The properties of the static premixer R' and the reactors (R1-R5) have been shown in Table 1 above.

[0452] The hexanol / DBU mixture and the feed conduit portion of the H12MDI were co-heated. This caused the materials to preheat slightly before contacting the PEG 8000 and thus prevented the melt from solidifying and clogging.

[0453]...

Embodiment 2

[0479] Preparation of polyurethane composition with diluent

[0480] The polyurethane polymer was obtained by following the method described in Example 1.

[0481] The amounts (% by weight) of the compounds used to prepare the polyurethane polymers are provided in Table 6.

[0482] Table 6

[0483] serial number compound Amount (weight%) 1. PEG 91.5 2. Isocyanate (H12 MDI) 5.2 3. alcohol (hexanol) 3.2 4. catalyst 0.08 5. Solubilizers 0

[0484] The resulting polyurethane polymer was taken for analysis and viscosity measurement. The viscosity of the polyurethane measured at a temperature of 100° C. is 200 Pa.s.

[0485] Water is then added to the resulting polyurethane and obtained to have a viscosity according to DIN EN ISO 3219 at a temperature of 23 °C ± 0.2 °C and 1 s -1 The polyurethane composition measured at a shear rate of 2.020Pa.s.

[0486] The polyurethane composition contained total polymer (25.0% by weight),...

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Abstract

The presently claimed invention provides a continuous process for preparing a polyurethane composition which behaves as a rheology modifier upon addition to paint and coating formulations. The present process employs mixers for homogenization of highly viscous polyurethane polymers and by adjusting the process parameters and reactor conditions in specified ranges obtained a polyurethane composition. The polyurethane composition obtained from the process of the present invention is used as thickener in water-borne paint and coating formulations.

Description

[0001] field of invention [0002] The present invention provides a continuous process for the preparation of polyurethane compositions useful as rheology modifiers and providing non-Newtonian rheological properties when added to paint and coating formulations. The polyurethane compositions obtained by the process of the invention are used as thickeners in aqueous paint and coating formulations. [0003] Background of the invention [0004] Today's surface coating systems are increasingly made water-based to reduce volatile organic component (VOC) emissions. However, the pigments, binders and other ingredients dispersed in the surface coating composition are not completely water soluble and should not settle during storage and transportation, but should remain stably dispersed in the system. In order to improve the settling resistance of each component, higher viscosity is required. However, it is required during production or use that the viscosity of the fluid, ie the easil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/75C08K3/34C08G18/08C08G18/22C08G18/28C09D7/43C08G18/20C08L75/08C08K5/16
CPCC08G18/0895C08G18/2063C08G18/227C08G18/2825C08G18/2835C08G18/4833C08G18/758C08L75/08C09D7/40C08K5/16C09D7/63C08G18/283C08G18/755C09D175/04
Inventor S·萨尔辛格R·赖夏特
Owner BASF SE