JP2020002202A5

JP2020002202A5 -

Info

Publication number: JP2020002202A5
Application number: JP2018120858A
Authority: JP
Filing date: 2018-06-26
Publication date: 2021-07-26
Anticipated expiration: 2038-06-26

Description

すなわち、本発明は、以下を要旨とする；
（１）ポリオール成分、イソシアネート成分、発泡剤、触媒、整泡剤を含むポリウレタン原料組成物からなるポリウレタンフォームであって、
前記ポリオール成分が、重量平均分子量が４０００より大きく７０００以下、平均官能基数が２、及び平均水酸基価が２５ｍｇＫＯＨ／ｇ以上８０ｍｇＫＯＨ／ｇ以下のポリテトラメチレンエーテルグリコール（ＰＴＭＧ（Ｉ））を含み、
ＪＩＳＫ６２５５に準拠して測定されたポリウレタンフォームの反発弾性率が７５％以上であり、
ＪＩＳＫ６２５１に準拠して測定されたポリウレタンフォームの引張強度が１．０ＭＰａ以上、引張伸びが１５０％以上であることを特徴とするポリウレタンフォーム。
（２）前記ポリオール成分が、さらに重量平均分子量が１０００以上４０００以下、平均官能基数が２、及び平均水酸基価が８０ｍｇＫＯＨ／ｇ以上１７５ｍｇＫＯＨ／ｇ以下のポリテトラメチレンエーテルグリコール（ＰＴＭＧ（ＩＩ））を含み、
前記ポリオール成分を１００質量部としたときの前記ＰＴＭＧ（Ｉ）の含有量は、３０質量部以上７０質量部以下であることを特徴とする上記（１）記載のポリウレタンフォーム。
（３）ＪＩＳＫ７３１２に準拠し、アスカーゴム硬度計Ｃ型を用いて測定されたポリウレタンフォームの硬度が４０以上６５以下であることを特徴とする上記（１）または（２）に記載のポリウレタンフォーム。
（４）前記ポリウレタンフォームを直径２９ｍｍ、厚み１２．５ｍｍの円柱状となるように切り出してなる試験片を準備し、該試験片に５．１ｋｇの錘を５０ｍｍの高さから衝突させた場合に、試験片への最大衝撃荷重が１．０ｋＮ以下である、上記（１）から（３）のいずれかに記載のポリウレタンフォーム。
（５）モールド成型体である、上記（１）から（４）のいずれかに記載のポリウレタンフ
ォーム。
（６）上記（１）から（５）のいずれかに記載のポリウレタンフォームを用いたことを特徴とする靴底部材。
That is, the present invention has the following gist;
(1) A polyurethane foam composed of a polyurethane raw material composition containing a polyol component, an isocyanate component, a foaming agent, a catalyst, and a foam stabilizer.
The polyol component contains polytetramethylene ether glycol (PTMG (I)) having a weight average molecular weight of more than 4000 and 7,000 or less, an average number of functional groups of 2, and an average hydroxyl value of 25 mgKOH / g or more and 80 mgKOH / g or less.
The elastic modulus of the polyurethane foam measured according to JIS K 6255 is 75% or more.
A polyurethane foam characterized in that the tensile strength of the polyurethane foam measured in accordance with JIS K 6251 is 1.0 MPa or more and the tensile elongation is 150% or more.
(2) The polyol component further comprises polytetramethylene ether glycol (PTMG (II)) having a weight average molecular weight of 1000 or more and 4000 or less, an average number of functional groups of 2, and an average hydroxyl value of 80 mgKOH / g or more and 175 mgKOH / g or less. Including
The polyurethane foam according to (1) above, wherein the content of PTMG (I) is 30 parts by mass or more and 70 parts by mass or less when the polyol component is 100 parts by mass.
(3) The polyurethane foam according to (1) or (2) above, wherein the hardness of the polyurethane foam measured using an Asker rubber hardness tester C type in accordance with JIS K 7312 is 40 or more and 65 or less. ..
(4) When a test piece obtained by cutting out the polyurethane foam into a columnar shape having a diameter of 29 mm and a thickness of 12.5 mm is prepared, and a 5.1 kg weight is made to collide with the test piece from a height of 50 mm. The polyurethane foam according to any one of (1) to (3) above, wherein the maximum impact load on the test piece is 1.0 kN or less.
(5) The polyurethane foam according to any one of (1) to (4) above, which is a molded body.
(6) A shoe sole member using the polyurethane foam according to any one of (1) to (5) above.

本発明のポリオール成分としては、重量平均分子量が４０００より大きく７０００以下、平均官能基数が２、及び平均水酸基価が２５ｍｇＫＯＨ／ｇ以上８０ｍｇＫＯＨ／ｇ以下のポリテトラメチレンエーテルグリコール（ＰＴＭＧ（Ｉ））を含む。
As the polyol component of the present invention, polytetramethylene ether glycol (PTMG (I)) having a weight average molecular weight of more than 4000 and 7000 or less, an average number of functional groups of 2, and an average hydroxyl value of 25 mgKOH / g or more and 80 mgKOH / g or less is used. include.

本発明では、ポリオール成分としてＰＴＭＧ（Ｉ）とは重量平均分子量が異なるＰＴＭＧを１種、又は２種以上混合して用いてもよい。
ＰＴＭＧ（Ｉ）以外のＰＴＭＧとしては、重量平均分子量が１０００以上４０００以下、平均官能基数が２、及び平均水酸基価が８０ｍｇＫＯＨ／ｇ以上１７５ｍｇＫＯＨ／ｇ以下のポリテトラメチレンエーテルグリコール（ＰＴＭＧ（ＩＩ））が使用できる。
In the present invention, one or a mixture of two or more PTMGs having a weight average molecular weight different from that of PTMG (I) may be used as the polyol component.
Examples of PTMGs other than PTMG (I) include polytetramethylene ether glycol (PTMG (II)) having a weight average molecular weight of 1000 or more and 4000 or less, an average number of functional groups of 2, and an average hydroxyl value of 80 mgKOH / g or more and 175 mgKOH / g or less. Can be used.

ポリオール成分としてＰＴＭＧ（Ｉ）とＰＴＭＧ（ＩＩ）を含む場合、ポリオール成分を１００質量部としたときのＰＴＭＧ（Ｉ）の含有量は、３０質量部以上７０質量部以下が好ましい。
ＰＴＭＧ（Ｉ）の含有量が３０質量部未満だと、反発弾性の高いポリウレタンフォームは得られるものの、引張強度や引張伸びが劣る傾向になる。また、ＰＴＭＧ（Ｉ）の含有量が多いほど、得られるポリウレタンフォームの反発弾性率、引張強度、及び引張伸びは良好となるが、ＰＴＭＧ（Ｉ）の含有量が７０質量部を超えると、ポリウレタンフォーム表面のわずかなべた付き、欠けなどが発生しやすくなり、成型性に劣るおそれがあった。そのことから、好ましくは、ポリオール成分を１００質量部に対し、ＰＴＭＧ（Ｉ）の含有量は３０質量部以上７０質量部以下である。 When PTMG (I) and PTMG (II) are contained as the polyol component, the content of PTMG (I) when the polyol component is 100 parts by mass is preferably 30 parts by mass or more and 70 parts by mass or less.
When the content of PTMG (I) is less than 30 parts by mass, a polyurethane foam having high impact resilience can be obtained, but the tensile strength and tensile elongation tend to be inferior. Further, the higher the content of PTMG (I), the better the elastic modulus, tensile strength, and tensile elongation of the obtained polyurethane foam, but when the content of PTMG (I) exceeds 70 parts by mass, the polyurethane The foam surface is likely to be slightly sticky or chipped, and the moldability may be inferior. Since the, good Mashiku, relative to 100 parts by weight of the polyol component, the content of PTMG (I) is less than 70 parts by mass or more 30 parts by weight.

Claims

A polyurethane foam composed of a polyurethane raw material composition containing a polyol component, an isocyanate component, a foaming agent, a catalyst, and a foam stabilizer.
The polyol component contains polytetramethylene ether glycol (PTMG (I)) having a weight average molecular weight of more than 4000 and 7,000 or less, an average number of functional groups of 2, and an average hydroxyl value of 25 mgKOH / g or more and 80 mgKOH / g or less.
The elastic modulus of the polyurethane foam measured according to JIS K 6255 is 75% or more.
A polyurethane foam characterized in that the tensile strength of the polyurethane foam measured in accordance with JIS K 6251 is 1.0 MPa or more and the tensile elongation is 150% or more.

The polyol component further contains polytetramethylene ether glycol (PTMG (II)) having a weight average molecular weight of 1000 or more and 4000 or less, an average number of functional groups of 2, and an average hydroxyl value of 80 mgKOH / g or more and 175 mgKOH / g or less.
The polyurethane foam according to claim 1, wherein the content of PTMG (I) is 30 parts by mass or more and 70 parts by mass or less when the polyol component is 100 parts by mass.

The polyurethane foam according to claim 1 or 2, wherein the hardness of the polyurethane foam measured by using an Asker rubber hardness tester C type according to JIS K 7312 is 40 or more and 65 or less.

A test piece obtained by cutting out the polyurethane foam into a columnar shape having a diameter of 29 mm and a thickness of 12.5 mm is prepared, and when a 5.1 kg weight is made to collide with the test piece from a height of 50 mm, the test piece is used. The polyurethane foam according to any one of claims 1 to 3, wherein the maximum impact load on the surface is 1.0 kN or less.

The polyurethane foam according to any one of claims 1 to 4, which is a molded body.

A shoe sole member using the polyurethane foam according to any one of claims 1 to 5.