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Thermoplastic polyurethanes composition and preparation processes thereof

A technology of thermoplastic polyurethane and composition, which is applied in the field of thermoplastic polyurethane composition, can solve the problems of increased abrasion, not mentioned alkyl cyclohexanedicarboxylate, etc., and achieve the effect of lowering the glass transition temperature

Inactive Publication Date: 2015-02-25
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, the aforementioned documents fail to mention that alkyl cyclohexanedicarboxylates improve the processability of polyether-based TPUs in injection molding processes without at the same time causing an increase in the amount of wear and undesirably significant shrinkage and surface precipitation of the final product

Method used

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  • Thermoplastic polyurethanes composition and preparation processes thereof
  • Thermoplastic polyurethanes composition and preparation processes thereof
  • Thermoplastic polyurethanes composition and preparation processes thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Example 1: Polyether-based TPU compositions containing different additives prepared by "one-step" reactive extrusion.

[0105] Sample 1.1: Process 480.0 g of diphenylmethane 4,4'-diisocyanate (available from BASF's MDI, hereinafter abbreviated as "MDI"), 101.5g of 1,4-butanediol (BDO purchased from BASF, the same below) and 800.0g polytetrahydrofuran (purchased from BASF's BDO) with a number average molecular weight of 1000g / mol PTHF 1000, the same below) and 13.9 g of pentaerythritol tetrakis (3-(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl) propionate) and 3, 3'-bis(3,5-di-tert-butyl-4-hydroxyphenyl)-N,N'-hexamethylenebispropionamide (purchased from BASF 1125) in a 1:1 mixture. In this process, all components except the MDI were preheated to 165° C. and fed into the first barrel of a ZSK 58 twin-screw extruder from Werner & Pfleiderer. Subsequently, the MDI preheated to 65° C. was put into the first barrel of the extruder. The rotational speed of the twin-screw sys...

Embodiment 2

[0117] Example 2: Polyether-based TPU compositions containing different additives and having substantially the same hardness prepared by the "one-step" belt transmission line method.

[0118] Sample 2.1: 500.0g of MDI, 90.9g of BDO, 1000.0g of PTHF1000 and 16.1g of 1125 blended and processed by belt transfer line method to obtain TPU granules. During this process, all components are preheated to 80°C and then thoroughly mixed in a stirred tank. When the reaction mixture reaches 90 to 95°C, it is poured on a continuous conveyor belt at 130 to 170°C and forms a TPU sheet on the belt after 5 to 15 minutes. Continuously produced TPU boards are crushed and homogenized in a crushing and homogenizing device with a terminal. The homogenized mass is then melted in a single-screw extruder with a zone temperature of 170°C to 230°C and finally pelletized by means of an underwater pelletizer.

[0119] Sample 2.2: The preparation of sample 2.1 was repeated, except that 2.4 g of the lubr...

Embodiment 3

[0129] Example 3: Polyether-based TPU compositions containing different additives prepared by the "two-step" method.

[0130] Sample 3.1: 630.0g of MDI, 180.6g of 1,6-hexanediol (HDO purchased from BASF), 1000.0g of PTHF 1000 and 9.1g of 1125 mixed and processed by the same belt transfer line method as sample 2.1 to obtain TPU granules.

[0131] Sample 3.2: 533.5g of MDI, 135.0g of HDO, 1000.0g of PTHF 1000 and 8.4g of 1125 mixed and processed by the same belt transfer line method as sample 2.1 to obtain TPU granules.

[0132] Sample 3.3: 1910.0 g of sample 3.1 were preheated at 120° C. for 2 hours, then 90.0 g (4.5% by weight) of DINCH were thoroughly mixed with the hot granules. The mixture was then placed in a closed container and annealed at 80 °C for 20 h. The DINCH-containing TPU pellets are then cooled and ready for injection molding.

[0133] Sample 3.4: 1910.0 g of sample 3.1 was preheated at 120° C. for 2 hours, and then 90.0 g (4.5% by weight, based on total T...

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Abstract

This invention is directed to a thermoplastic polyurethanes composition comprising polyether-based thermoplastic polyurethane and 1,2-cyclohexane dicarboxylic acid ester and preparation processes thereof. The thermoplastic polyurethane composition has a good mold release behavior in injection molding without undesirably significant shrinkage and surface blooming of final product.

Description

technical field [0001] The present invention relates to a thermoplastic polyurethane composition having good mold release properties in injection molding and low shrinkage of the final product and a method for preparing the same. Background technique [0002] Thermoplastic polyurethanes (TPU) are of industrial importance in many fields of application due to the combination of good mechanical properties and known inexpensive thermoplastic processability. By modifying the components of TPU, many properties can be achieved. Among various TPUs, polyether-based TPU has become one of the most important series due to its excellent hydrolysis resistance and low-temperature flexibility. A review of TPUs including their properties and applications can be found in Hans-Georg Wussow, "Thermoplastic Elastomers", Ullmann's Encyclopedia of Industrial Chemistry, Electronic Release, 7th Edition, Chapter 2 "Thermoplastic Polyurethane Elastomers", Wiley VCH, Weinheim, 2004. [0003] Soft the...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K5/00
Inventor 庄巍陈斌野村晃山本悦弘曲建强近藤美智林光F·舍费尔
Owner BASF SE
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