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Support material for laminate shaping, product laminate-shaped by using the same, and laminate-shaped product production method

a technology of supporting materials and laminates, applied in metal-working apparatus, additive manufacturing apparatus, 3d object support structures, etc., can solve the problems of insufficient adhesiveness to model materials, unstable shape of support materials, and prone to deformation of support materials, etc., to achieve excellent peelability and forming stability, excellent shape stability and adhesiveness

Inactive Publication Date: 2017-03-30
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention aims to improve the quality of support materials used in laminate shaping processes. The new material should have better shape stability, adhesiveness to the model material, peelability, and forming stability to overcome the existing problems.

Problems solved by technology

However, the support materials hitherto proposed are liable to deform when a support material layer or a model material layer is laid over a previously formed support material layer before the previous layer is sufficiently cooled.
Therefore, the support materials suffer from unstable shape and insufficient adhesiveness to the model material.
This problematically reduces the shape reproducibility due to an offset between the support material layer and the model material layer.
Therefore, the support materials are unsatisfactory, and still require improvement.
Further, a method of entirely dissolving the support material to actually remove the support material is time-consuming.
The amorphous PVA proposed as the support material in PTL 3 cannot be easily peeled off with difficulty in deformation after the solidification, so that the amount of the support material to be dissolved away is increased.
The support material prepared by adding the SEBS to the amorphous PVA is soft and deformable, but is insufficient in toughness.
Therefore, the support material cannot be successfully peeled off, but is torn.
Further, the affinity between the PVA resin and the SEBS is weak, so that the melt formability is unstable and the shape reproducibility is reduced in the laminate shaping.
Thus, the conventional support materials are unsatisfactory in the aforementioned aspects, still requiring improvement.

Method used

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  • Support material for laminate shaping, product laminate-shaped by using the same, and laminate-shaped product production method
  • Support material for laminate shaping, product laminate-shaped by using the same, and laminate-shaped product production method
  • Support material for laminate shaping, product laminate-shaped by using the same, and laminate-shaped product production method

Examples

Experimental program
Comparison scheme
Effect test

embodiment (

Y)

[0064]The laminate shaping support material according to Embodiment (Y) employs a resin composition (Y) which contains a PVA resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group.

[0065][PVA Resin]

[0066]First, the PVA resin to be used in Embodiment (Y) will be described.

[0067]The PVA resin is a resin mainly including a vinyl alcohol structural unit and prepared by copolymerizing a vinyl ester monomer and saponifying the resulting polyvinyl ester resin. The PVA resin includes the vinyl alcohol structural unit in a proportion corresponding to a saponification degree, and includes an unsaponified vinyl ester structural unit.

[0068]Examples of the vinyl ester monomer include vinyl formate, vinyl acetate, vinyl propionate, vinyl valerate, vinyl butyrate, vinyl isobutyrate, vinyl pivala...

examples

[0136]The present invention will hereinafter be described more specifically by way of examples thereof. It should be understood that the present invention be not limited to these examples within the scope of the invention. In the examples, the term “part(s)” means part(s) by weight.

Examples of Embodiment (X)

Example 1

(i) Preparation of 1,2-Diol-Containing PVA Resin (1)

[0137]In a reaction vessel provided with a reflux condenser, a dropping funnel and a stirrer, 10% of 68.5 parts of vinyl acetate and 20.5 parts of methanol were first fed, and the rest of the vinyl acetate and 11.0 parts (7.2 mol % with respect to the amount of vinyl acetate to be fed) of 3,4-diacetoxy-1-butene were fed dropwise at constant rates in 9 hours. Then, 0.3 mol % (with respect to the amount of the fed vinyl acetate) of azobisisobutyronitrile was fed into the reaction vessel. In turn, the temperature was raised while the resulting mixture was stirred in a nitrogen stream, thereby initiating polymerization. Whe...

example 2

(i) Preparation of 1,2-Diol-Containing PVA Resin (2)

[0145]In substantially the same manner as in Example 1, 40% of 72.1 parts of vinyl acetate and 21.6 parts of methanol were first fed in a reaction vessel, and the rest of the vinyl acetate and 6.3 parts of 3,4-diacetoxy-1-butene were fed dropwise at constant rates in 8 hours. Then, 0.16 mol % (with respect to the amount of the fed vinyl acetate) of azobisisobutyronitrile was fed in the reaction vessel. In turn, the temperature was raised while the resulting mixture was stirred in a nitrogen stream, thereby initiating polymerization. When the polymerization degree of vinyl acetate reached 90%, a predetermined amount of m-dinitrobenzene was added to the reaction vessel to terminate the polymerization. Subsequently, methanol vapor was blown into the reaction vessel, whereby unreacted vinyl acetate monomer was removed out of the reaction vessel. Thus, a copolymer was prepared in the form of a methanol solution.

[0146]The methanol soluti...

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Abstract

A laminate-shaping support material includes one of: a resin composition containing a polyvinyl alcohol resin having a primary hydroxyl group at its side chain, and having a heat of fusion of 10 to 30 J / g at its melting point (Embodiment (X)); and a resin composition containing a polyvinyl alcohol resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group (Embodiment (Y)). Therefore, the laminate shaping support material according to Embodiment (X), for example, is excellent in shape stability and adhesiveness to a model material. The laminate shaping support material according to Embodiment (Y) is excellent in peelability and forming stability.

Description

TECHNICAL FIELD[0001]The present invention relates to a laminate shaping support material to be used for laminate shaping and thereafter removed (hereinafter sometimes referred to simply as “support material”) and a product laminate-shaped by using the support material. The invention further relates to a laminate-shaped product production method. More specifically, the invention relates to a laminate shaping support material which is excellent in shape stability, adhesiveness to a model material, peelability and forming stability.[0002]The term “model material” means a material for the product to be shaped, and the term “support material” means a support-forming material which facilitates the shaping of the model material and is removed after the shaping in most cases.BACKGROUND ART[0003]The term “laminate shaping” means a method of shaping a three-dimensional product having a predetermined structure. A fluid material is solidified immediately after being extruded, and further laid ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C67/00C08L29/04B33Y70/00B33Y10/00B33Y30/00
CPCB29C67/0092B29C67/0055B33Y10/00B33Y30/00B29K2995/0096C08L29/04B29K2055/02B29K2829/04B29K2995/0098B33Y70/00B29C67/00C08L53/02C08F218/08B29C64/40B29C64/118C08F218/14B29K2029/04B29K2995/0039B29C64/106
Inventor SAKAI, NORIHITOMANDAI, SHUSAKU
Owner MITSUBISHI CHEM CORP
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