Support material for laminate shaping, product laminate-shaped by using the same, and laminate-shaped product production method
A laminate shaping support material is provided which 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.
1. A method of forming a resin composition into a laminate-shaping support material comprising,
heat-melting a resin composition comprising a polyvinyl alcohol resin including a structural unit with a side chain having a primary hydroxyl group, and having a melting point heat of fusion of 10 to 30 J/g;
wherein the heat of fusion is measured by using a differential scanning calorimeter at a temperature increase rate of 10° C./min, and the heat of fusion is calculated based on a heat absorption peak area observed at the melting point in the temperature increase as heat ΔH (J/g) of fusion; and
wherein, in an analysis chart in which an abscissa axis is defined as an axis of temperature, the heat absorption peak area is an area enclosed by a base line and a heat absorption peak, the base line being defined as a straight line connecting a point A at a temperature higher by 5° C. than an end point of the absorption peak of a curve and a point B at a temperature lower by 40° C. than an apex of the heat absorption peak of the curve; and
forming the heat-melted resin composition into a laminate-shaping support material.
2. The method according to claim 1 , wherein the side chain having a primary hydroxyl is a 1,2-diol structure.
3. The method according to claim 2 , wherein the structural unit with a side chain having a primary hydroxyl group is a structural unit represented by the following formula (1):
wherein R 1 , R 2 and R 3 are independently each a hydrogen atom or a C1 to C4 alkyl group, X is a single bond or a bonding chain, R 4 is independently a hydrogen atom or a C1 to C4 alkyl group, and R 5 and R 6 are independently each a hydrogen atom.
4. A method for forming a laminate-shaped product comprising:
laying a layer of a laminate-shaping support material and a layer of a model material one on another in a fluid state;
solidifying the support material and the model material; and
removing the support material,
wherein the laminate-shaping support material consists of a resin composition comprising a polyvinyl alcohol resin including a structural unit with a side chain having a primary hydroxyl group, and having a melting point heat of fusion of 10 to 30 J/g;
wherein the heat of fusion is measured by using a differential scanning calorimeter at a temperature increase rate of 10° C./min, and the heat of fusion is calculated based on a heat absorption peak area observed at the melting point in the temperature increase as heat ΔH (J/g) of fusion; and
wherein, in an analysis chart in which an abscissa axis is defined as an axis of temperature, the heat absorption peak area is an area enclosed by a base line and a heat absorption peak, the base line being defined as a straight line connecting a point A at a temperature higher by 5° C. than an end point of the absorption peak of a curve and a point B at a temperature lower by 40° C. than an apex of the heat absorption peak of the curve.