Method for the 3D printing of two-component polyurethane compositions

A two-component polyurethane, 3D printing technology, applied in the direction of 3D object support structure, additive manufacturing, application, etc., can solve the problems of slowing down 3D printing, limiting printing speed, short service life, etc., to achieve improved mechanical properties and improved The effect of heat resistance

Pending Publication Date: 2021-07-23
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 3D printing method is also limited by the fact that since the material must be heated, heatable 3D printing elements are required and the method is relatively slow because the cooling process that causes the printed material to solidify limits the printing speed
Either the pot life (i.e. the time the components can still be applied after mixing) is extremely short for a composition that cures quickly and builds strength, or cure and strength build is slower when processing a composition with a longer pot life, This can drastically slow down 3D printing, as for large molded objects one has to wait until the underlying layers are fully cured

Method used

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  • Method for the 3D printing of two-component polyurethane compositions
  • Method for the 3D printing of two-component polyurethane compositions
  • Method for the 3D printing of two-component polyurethane compositions

Examples

Experimental program
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Effect test

preparation example Construction

[0127]The preparation of the two components is preferably carried out separately from one another with the exclusion of moisture. The two components are usually stored separately in their own containers. Further constituents of the polyurethane composition may be present as constituents of the first or second component, wherein further constituents reactive towards isocyanate groups are preferably constituents of the first component. Suitable containers for storing the individual components are in particular barrels, bottles, bags, buckets, tanks, cartridges or tubes. Both components are storage-stable, ie they can be stored for several months to a year and longer before use without changing their individual properties to the extent relevant to their use.

[0128] The two components are stored separately from one another prior to mixing the composition and are mixed with one another at or immediately before use. Said components are advantageously present in a package consist...

Embodiment

[0167] Substances used:

[0168]

[0169] Table 1: Substances used

[0170]Preparation of Components A and B

[0171] For each composition, the ingredients of the first component A given in Table 2 below were processed into a homogeneous paste in the given amounts (expressed in parts by weight or % by weight) by means of a vacuum dissolver with the exclusion of moisture And airtight preservation. Likewise, the ingredients of the second component B given in the table are processed and saved. Each of the two components is filled in one chamber of an airtight double cartridge.

[0172]

[0173]

[0174] Table 2: Two-component polyurethane compositions for 3D printing

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Abstract

The present invention relates to a method for applying a two-component polyurethane composition by means of 3D printing, comprising the steps: providing a pumpable first component A, comprising at least one polyol, which has an OH functionality in the range of 1.5 to 4 and an average molecular weight (number average) Mn in the range of 250 to 15000 g / mol, preferably at least one diol, which has two hydroxyl groups, which are linked by means of a C2- to C9- carbon chain, and at least one compound T, which has at least one thiol group; feeding a pumpable second component B into the mixing region of the continuous mixer, the second component B comprising at least one polyisocyanate, wherein: in one of the two components A and B, additionally at least one metal catalyst for the reaction of hydroxyl groups and isocyanate groups is contained, which metal catalyst can form thio complexes, and the molar ratio of all the thiol groups of the at least one compound T to all the metal atoms of the at least one metal catalyst is between 1:1 and 250:1.

Description

technical field [0001] The invention relates to a 3D printing method of a two-component polyurethane composition and a molded body prepared therefrom. Background technique [0002] 3D printing is a method that has been used more and more recently for the preparation of three-dimensional objects. It is mainly used in the commercial sector (for example for prototypes or design studies) as a fast, flexible alternative to injection molding and allows almost unlimited molding when producing small objects. The 3D printing method is also known as freeform construction or additive manufacturing (AM). Typical printing materials for 3D printing are thermoplastics such as polylactic acid (polylactide, PLA) or acrylonitrile-butadiene-styrene (ABS), which are heated and applied point-by-point or layer-by-layer in a plastic state , then solidifies and solidifies rapidly. Material application is typically by computer-controlled moving printheads. The polymer acquires sufficient strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/10C08G18/22C08G18/32C08G18/38C08L75/08B33Y70/00B29C64/00
CPCC08G18/10C08G18/227C08G18/3206C08G18/3876C08G18/4841B33Y10/00B33Y70/00B29C64/106C08L75/08C08K3/04C08K3/346C08G18/6666B29K2075/00C08G18/4829C08G18/6674C08G18/7671C09D11/102
Inventor D·卢滕斯M·利亚尔N·波纳迪尼F·查格农-勒斯特雷A·科萨罗
Owner SIKA TECH AG
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