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Preparation material for steam-curable polyurethane formwork for modeling concrete, steam-curable polyurethane formwork and preparation method thereof

A polyurethane and concrete technology, applied in the field of modeling concrete, can solve problems such as damage, poor aging resistance, and low tensile strength

Active Publication Date: 2021-10-29
BEIJING MUNICIPAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica gel material is easy to form, the price is moderate, the template is strong in alkali resistance, and it is widely used. However, due to the low tensile strength, it is easy to tear and the number of uses is limited. Therefore, the template made of silica gel is generally used as a one-time or occasional use
The template prepared by the polyurethane preparation material has high tensile strength, tear resistance, and can be used repeatedly, but the alkali hydrolysis resistance of general polyurethane is poor, and the template prepared by this will also have shrinkage problems after being used many times, especially for As far as precast concrete is concerned, in order to shorten the concrete production cycle, steam curing is used. During the steam curing process, the temperature is high, and the alkalinity of the concrete is large. As a result, in the concrete steam curing environment, the strength of the formwork decreases sharply, causing crack damage, and eventually leads to destruction. , poor aging resistance

Method used

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  • Preparation material for steam-curable polyurethane formwork for modeling concrete, steam-curable polyurethane formwork and preparation method thereof
  • Preparation material for steam-curable polyurethane formwork for modeling concrete, steam-curable polyurethane formwork and preparation method thereof
  • Preparation material for steam-curable polyurethane formwork for modeling concrete, steam-curable polyurethane formwork and preparation method thereof

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preparation example Construction

[0046] The present invention provides a method for preparing the steam-curable polyurethane formwork for modeling concrete described in the above technical solution, comprising the following steps:

[0047] (1) performing vacuum dehydration and cooling treatment on the mixture of part of the polyolefin polyol and the plasticizer in turn to obtain the first polyol compound;

[0048] (2) mixing the first polyol mixture obtained in the step (1) with isocyanate, and reacting to obtain a prepolymer;

[0049] (3) Carrying out vacuum dehydration and cooling treatment on the mixture of remaining polyolefin polyol and chain extender in turn to obtain the second polyol compound;

[0050] Mixing the second polyol compound, anti-aging agent, diluent, defoamer and catalyst under a protective atmosphere to obtain a curing agent;

[0051] (4) After the prepolymer obtained in the step (2) is mixed with the curing agent obtained in the step (3), defoaming, mold pouring and curing are carried ...

Embodiment 1

[0070] In terms of parts by mass, the preparation components are:

[0071] 52 parts of polyolefin polyol, BH1801 (hydroxyl value 48mgKOH / g), Tianjin Kefeng High-tech Co., Ltd.;

[0072] 15.7 parts of polyolefin polyol, BH1803 (101mgKOH / g), Tianjin Kefeng High-tech Co., Ltd.;

[0073] 10.4 parts of plasticizer, dioctyl phthalate, industrial grade, Beijing Chemical Materials Co., Ltd. share;

[0074] 37.6 parts of isocyanate, 100LL, Wanhua Chemical Group Co., Ltd.;

[0075] Diluent 0.9 parts, dimethyl adipate, industrial grade, Beijing Chemical Materials Co., Ltd.;

[0076] 15.7 parts of chain extender, BH760 (hydroxyl value 760), Tianjin Kefeng High-tech Co., Ltd.;

[0077] 0.03 parts of anti-aging agent, K1010, Beijing Chemical Raw Materials Co., Ltd.;

[0078]0.14 part of antifoaming agent, BYK-088, German BYK (BYK) chemical company;

[0079] Catalyst 0.03 parts, dibutyltin silicate in February, industrial grade, Beijing Chemical Raw Material Company.

[0080] Put 52kg...

Embodiment 2

[0084] In terms of parts by mass, the preparation components are:

[0085] 39.2 parts of polyolefin polyol, BH1801 (hydroxyl value 48mgKOH / g), Tianjin Kefeng High-tech Co., Ltd.;

[0086] 20.1 parts of polyolefin polyol, BH1803 (101mgKOH / g), Tianjin Kefeng High-tech Co., Ltd.;

[0087] 7.8 parts of plasticizer, dimethyl sebacate, industrial grade, Beijing Chemical Materials Co., Ltd.;

[0088] 53 parts of isocyanate, 103C, German Bayer company;

[0089] 3 parts of diluent, dimethyl carbonate, industrial grade, Beijing Chemical Materials Co., Ltd.;

[0090] 26.2 parts of chain extender, BH760 (hydroxyl value 760), Tianjin Kefeng High-tech Co., Ltd.;

[0091] 0.4 parts of anti-aging agent, K1010, Beijing Chemical Raw Materials Co., Ltd.;

[0092] 0.1 part of defoamer, BYK-088, Germany BYK (BYK) chemical company;

[0093] Catalyst 0.2 parts, organic vanadium catalyst, industrial grade, Tianjin Kefeng High-tech Co., Ltd.

[0094] 39.2kg of polyolefin polyol BH1801 with a hyd...

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Abstract

The invention belongs to the technical field of modeling concrete, and in particular relates to a preparation material for a steam-curable polyurethane formwork for modeling concrete, a steam-curable polyurethane formwork and a preparation method thereof. The invention provides a preparation material for steam-curable polyurethane formwork for modeling concrete, which comprises the following components in parts by mass: 45-75 parts of polyolefin polyol; 20-80 parts of isocyanate; 5-35 parts of plasticizer; diluent 0-20 parts; chain extender 3-25 parts; anti-aging agent 0-3 parts; defoamer 0-1.5 parts; catalyst 0-3 parts. The tensile strength of the steam-curable polyurethane template obtained with the preparation material of the present invention is 5.5-8.5MPa, the elongation at break is 210-380%, and the tear resistance is strong; after soaking in 70°C and 20% NaOH solution for 1000h The loss rate of tensile strength is 4.5-5.8%, and the steam-curable polyurethane template has strong alkali hydrolysis resistance and aging resistance.

Description

technical field [0001] The invention belongs to the technical field of modeling concrete, and in particular relates to a preparation material for a steam-curable polyurethane formwork for modeling concrete, a steam-curable polyurethane formwork and a preparation method thereof. Background technique [0002] Modeling concrete is a kind of ordinary concrete surface, through the creative design of texture, texture and irregular lines, the organic combination of patterns and colors, to create a variety of concrete products similar to natural marble, granite, bricks, tiles and other laying effects. It has the characteristics of beautiful and natural graphics, strong and durable texture. [0003] The key technology in the production of shaped concrete is the shaped formwork. The formwork is the part that is in direct contact with the concrete. It is used in a large amount and has a wide area in the construction of concrete structures, which determines the shape, size and appearanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/69C08G18/66C08G18/65C08G18/48C08G18/36C08K5/11C08K5/12
Inventor 夏春蕾强顺凯冯树洲曹迪尼
Owner BEIJING MUNICIPAL ENG RES INST