Preparation method of polyurethane elastomer

A polyurethane elastomer and polycaprolactone diol technology, applied in the polymer field, can solve the problems of low physical and mechanical properties of materials, prone to defects, long molding cycle, etc., to avoid internal stress of materials, controllable operation time, The effect of reducing the demolding time

Inactive Publication Date: 2015-12-02
XIAMEN MINGLAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1314922 discloses a method for manufacturing optically transparent and high-hardness impact-resistant polyurethane materials, in which only the formula is described in detail, using aliphatic isocyanate and aromatic amine curing agent to react to obtain polyurethane materials, but does not mention clearly The operating time and demoulding time of the material, so the influence of material properties and molding process on the processing performance of subsequent transparent products is unpredictable
[0005] Chinese patent CN102918073 discloses a polyurethane composition with improved impact resistance and optical properties. Its production method: the isocyanate component uses 1,3-bis(isocyanatomethyl) and 1,4-bis(isocyanate base methyl) react with isocyanate-reactive compounds of two molecular weights to synthesize a prepolymer with an NCO content of 8-15%, react with an aromatic amine curing agent, inject the material into a mold preheated to 115°C for curing, and remove The mold time is less than 25min, but the operation time of the material is not specified in detail, and the molding and post-processing of complex products are not yet known
[0007] The above patents all use ordinary aromatic amine curing agents. After the isocyanate component and curing agent component are mixed, due to the high reactivity, the operating time of the material is short, usually only about 1 to 2 minutes, so the material is in the molding process. Defects (such as air bubbles, streamlines, etc.) are prone to appear in the middle, which seriously affects the yield of the product; especially for some complex transparent parts, complex secondary machining is required after molding, and the lower physical and mechanical properties of the material will also Affect the processing yield of the product
In addition, the traditional heating method leads to a long molding cycle for a single product, which affects the production cost of batch products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Prepolymer: 60 parts of PCL210, add 36 parts of H under normal pressure 12 MDI and 4 parts of IPDI are heated up to 80-100°C for 3-4 hours to obtain a prepolymer with an isocyanate group content of 8%.

[0036](2) Mixing and pouring: 62 parts of sodium chloride complex of MDA, 1 part of catalyst DABCOMB20, 1 part of antioxidant 1076, 1 part of ultraviolet absorber UV-328, and 100 parts of 30-60 ° C Mix the prepolymer components uniformly at 30-60°C, mix together for 2-10 minutes and remove air bubbles through vacuum; inject the reactive mixture into a mold at room temperature; heat the mold in a microwave environment for 6 minutes, and control the temperature at 70~150°C; release the product from the mold, and test its performance after standing for 7 days. The Shore D hardness of the product is 68. The test data are shown in Table 2.

Embodiment 2

[0038] (1) Prepolymer: 25 parts of PCL210, add 60 parts of H under normal pressure 12 MDI, 15 parts of IPDI is heated to 80-100° C. for 3-4 hours to obtain a prepolymer with an isocyanate group content of 19%.

[0039] (2) Curing agent: Dehydrate 35 parts of PCL220, 1.5 parts of catalyst DABCOMB20, 1.5 parts of antioxidant 1076, and 1.5 parts of ultraviolet absorber UV-328 at 100-110 °C and -0.095 MPa until the moisture is less than 0.05%. Cool down to 50-60°C, add 133 parts of sodium chloride complex of MDA and mix evenly to obtain a curing agent.

[0040] (3) Mixing and pouring: Mix 173 parts of curing agent and 100 parts of prepolymer at 30-60°C, mix them together for 2-10 minutes and remove air bubbles through vacuum; inject the reactive mixture into the mold at room temperature ;Put the mold in a microwave environment and heat it for 10 minutes, and control the temperature at 70-150°C; release the product from the mold, and test its performance after standing for 7 days....

Embodiment 3

[0042] (1) Prepolymer: 25 parts of PCL210, add 60 parts of H under normal pressure 12 MDI, 15 parts of IPDI is heated to 80-100° C. for 3-4 hours to obtain a prepolymer with an isocyanate group content of 19%.

[0043] (2) Curing agent: Dehydrate 50 parts of PCL210, 1.5 parts of catalyst DABCOMB20, 1.5 parts of antioxidant 1076, and 1.5 parts of ultraviolet absorber UV-328 at 100-110 °C and -0.095 MPa until the moisture is less than 0.05%. Cool down to 50-60°C, add 114 parts of sodium chloride complex of MDA and mix evenly to obtain a curing agent.

[0044] (3) Mixing and pouring: Mix 169 parts of curing agent and 100 parts of prepolymer at 30-60°C, mix them together for 2-10 minutes and remove air bubbles through vacuum; inject the reactive mixture into the mold at room temperature ;Put the mold in a microwave environment and heat it for 9 minutes, and control the temperature at 70-150°C; release the product from the mold, and test its performance after 7 days, and the produ...

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PUM

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Abstract

The invention provides a preparation method of a polyurethane elastomer, relating to polymers. The invention provides a preparation method of a polyurethane elastomer which has excellent impact resistance and machining characteristic and is especially suitable for preparing transparent polyurethane glasses frame products with high yields and low defects. The preparation method comprises the following steps: 1) preparing a prepolymer: mixing isocyanate with polyols to react to obtain the prepolymer; 2) preparing a curing agent: specifically, dehydrating the polyols, catalysts and anti-aging agents until the mass percent of the moisture is smaller than 0.05%, and adding chain extenders after reducing the temperature, thus obtaining the curing agent; and 3) mixing the prepolymer with the curing agent, then carrying out vacuum defoaming, injecting a reactive mixture after vacuum defoaming into a mold, then putting the mold in a microwave environment to be heated, and carrying out demolding, thus obtaining the polyurethane elastomer. The preparation method has the advantages of good processing properties, low material operating temperature, controllable operating time, high production efficiency and high yield.

Description

technical field [0001] The invention relates to polymers, in particular to a method for preparing polyurethane elastomers. Background technique [0002] Polymer materials with good optical properties and high impact resistance can be widely used in architectural glass, vehicle glass windows, explosion-proof shields and glasses, etc. At present, the plastic materials with practical application value mainly include polymethylpropionic acid resin, polystyrene resin, polycarbonate resin, diethylene glycol bis(allyl carbonate) resin, transparent nylon and polyurethane resin and other materials. Among them, polycarbonate resin has excellent transparency, heat resistance and mechanical strength, but its weather resistance is poor; polystyrene resin has excellent performance in molding processability, rigidity, transparency, etc., but its bending resistance is poor; Polymethacrylic resin has good transparency and weather resistance, but its impact resistance is poor especially at l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/42C08G18/10C08K5/3475C08K5/134
CPCC08G18/722C08G18/10C08G18/4277C08G18/755C08G18/758C08K5/1345C08K5/3475C08G18/42
Inventor 黄朝明蔡庆烟
Owner XIAMEN MINGLAI TECH CO LTD
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