Low-hardness and high-strength pouring polyurethane elastomer and preparation method thereof

Abstract

The invention relates to the field of pouring polyurethane, in particular to a low-hardness and high-strength pouring polyurethane elastomer and a preparation method thereof. The first aspect of the invention provides pouring-type polyurethane; preparation raw materials include preparation raw materials of an component A, preparation raw materials of an component B and component C, wherein the preparation raw materials of the component A include oligomeric polyols, a catalyst, a polyhydroxy compound, small molecule dihydric alcohol and an anti-wear agent; the preparation raw materials of the component B include oligomeric polyols and diisocyanate; the component C is an adipate substance.

Description

technical field

[0001] The invention relates to the field of cast polyurethane, more specifically, the invention relates to a low-hardness, high-strength cast polyurethane elastomer and a preparation method thereof. Background technique

[0002] Casting polyurethane elastomer is a kind of thermosetting elastomer between rubber and plastic. It has many advantages such as high strength, wear resistance, solvent resistance, aging resistance, and large hardness adjustable range (shore A 0–shore D 80). , Su known as "wear-resistant rubber", "liquid rubber". Cast polyurethane elastomers with low hardness are widely used in sealing gaskets, printing rubber rollers, cleaning blades and other fields due to their good elasticity, high strength, aging resistance, and oil resistance. However, low-hardness castable polyurethane elastomers manufactured using conventional raw materials or formulas often have problems such as easy migration of plasticizers, low mechanical properties, and l...

Examples

preparation example Construction

[0043] A second aspect of the present invention provides a kind of preparation method of described cast polyurethane, comprises the steps:

[0044] (1) Add component C to component A, stir evenly, and vacuum until no bubbles overflow;

[0045] (2) Heat component B and evacuate until no bubbles overflow;

[0046] (3) Add component B to the raw materials for preparing component A, and stir to obtain a mixture;

[0047] (4) Pour the mixture into a rotating centrifuge, cool down, and take the sheet;

[0048] (5) Put the sheet into an oven for aging to obtain a low-hardness castable polyurethane elastomer sheet.

[0049] Preferably, the preparation method of the castable polyurethane comprises the steps of:

[0050] (1) Add component C to component A, control the temperature at 40-60°C, stir evenly, and evacuate until no bubbles overflow; the vacuum degree is -0.05-0.1MPa;

[0051] (2) Heat component B to 40-60°C, and evacuate until no bubbles overflow; the vacuum degree is -0....

Embodiment 1

[0064] Embodiment 1 of the present invention provides a kind of casting polyurethane, and preparation raw material comprises A component, B component and C component; By weight, the preparation raw material of A component comprises 90 parts of oligomeric polyol, 0.6 part Catalyst, 1.5 parts of polyols, 4 parts of small molecule diols, 0.35 parts of anti-wear agent; the raw materials for the preparation of component B include 55 parts of oligomeric polyols and 55 parts of diisocyanate; component C is 60 parts of adipic acid Esters;

[0065] The number-average molecular weight of oligomeric polyol in the preparation raw material of A component is the polycaprolactone of 4000;

[0066] The number-average molecular weight of the oligomeric polyol in the preparation raw material of B component is the polycaprolactone of 2000;

[0067] The diisocyanate is diphenylmethane diisocyanate;

[0068] The polyol is trishydroxyethylisocyanurate;

[0069] The small molecular diol is 1,3-pr...

Embodiment 2

[0082] Example 2 of the present invention provides a castable polyurethane, the specific implementation of which is the same as in Example 1, the difference is that the preparation raw materials include A component, B component and C component; by weight, A group The raw materials for the preparation of component B include 85 parts of oligomeric polyols, 0.2 parts of catalysts, 0.4 parts of polyols, 1 part of small molecule glycols, and 0.2 parts of anti-wear agents; the raw materials for the preparation of component B include 30 parts of oligomeric polyols and 30 parts of diisocyanate; C component is 55 parts of adipate.

technical field

[0001] The invention relates to the field of cast polyurethane, more specifically, the invention relates to a low-hardness, high-strength cast polyurethane elastomer and a preparation method thereof. Background technique

[0002] Casting polyurethane elastomer is a kind of thermosetting elastomer between rubber and plastic. It has many advantages such as high strength, wear resistance, solvent resistance, aging resistance, and large hardness adjustable range (shore A 0–shore D 80). , Su known as "wear-resistant rubber", "liquid rubber". Cast polyurethane elastomers with low hardness are widely used in sealing gaskets, printing rubber rollers, cleaning blades and other fields due to their good elasticity, high strength, aging resistance, and oil resistance. However, low-hardness castable polyurethane elastomers manufactured using conventional raw materials or formulas often have problems such as easy migration of plasticizers, low mechanical properties, and l...

Examples

preparation example Construction

[0043] A second aspect of the present invention provides a kind of preparation method of described cast polyurethane, comprises the steps:

[0044] (1) Add component C to component A, stir evenly, and vacuum until no bubbles overflow;

[0045] (2) Heat component B and evacuate until no bubbles overflow;

[0046] (3) Add component B to the raw materials for preparing component A, and stir to obtain a mixture;

[0047] (4) Pour the mixture into a rotating centrifuge, cool down, and take the sheet;

[0048] (5) Put the sheet into an oven for aging to obtain a low-hardness castable polyurethane elastomer sheet.

[0049] Preferably, the preparation method of the castable polyurethane comprises the steps of:

[0050] (1) Add component C to component A, control the temperature at 40-60°C, stir evenly, and evacuate until no bubbles overflow; the vacuum degree is -0.05-0.1MPa;

[0051] (2) Heat component B to 40-60°C, and evacuate until no bubbles overflow; the vacuum degree is -0....

Embodiment 1

[0064] Embodiment 1 of the present invention provides a kind of casting polyurethane, and preparation raw material comprises A component, B component and C component; By weight, the preparation raw material of A component comprises 90 parts of oligomeric polyol, 0.6 part Catalyst, 1.5 parts of polyols, 4 parts of small molecule diols, 0.35 parts of anti-wear agent; the raw materials for the preparation of component B include 55 parts of oligomeric polyols and 55 parts of diisocyanate; component C is 60 parts of adipic acid Esters;

[0065] The number-average molecular weight of oligomeric polyol in the preparation raw material of A component is the polycaprolactone of 4000;

[0066] The number-average molecular weight of the oligomeric polyol in the preparation raw material of B component is the polycaprolactone of 2000;

[0067] The diisocyanate is diphenylmethane diisocyanate;

[0068] The polyol is trishydroxyethylisocyanurate;

[0069] The small molecular diol is 1,3-pr...

Embodiment 2

[0082] Example 2 of the present invention provides a castable polyurethane, the specific implementation of which is the same as in Example 1, the difference is that the preparation raw materials include A component, B component and C component; by weight, A group The raw materials for the preparation of component B include 85 parts of oligomeric polyols, 0.2 parts of catalysts, 0.4 parts of polyols, 1 part of small molecule glycols, and 0.2 parts of anti-wear agents; the raw materials for the preparation of component B include 30 parts of oligomeric polyols and 30 parts of diisocyanate; C component is 55 parts of adipate.

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