Preparation method of bonding-free polyurethane lining mold
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A polyurethane and lining mold technology, applied in the field of prefabricated buildings, can solve the problems of low body strength, poor bonding, tearing, etc., and achieve the effect of delaying the speed of rusting again, eliminating the existence of air, and improving fluidity
Inactive Publication Date: 2021-01-15
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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[0006] The invention provides a method for preparing a non-adhesive polyurethane lining mold, which is mainly aimed at the gap between the polyurethane lining mold bonded to the surface of the steel mold table by the existing bonding process, and the surface of the steel mold table that is often derusted and polished, and has an uneven surface. Poor bonding and low body strength, problems such as "debonding", "bulging", "tearing" and "deformation" often occur in the process of preparing cement prefabricated parts
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Embodiment 1
[0054] A method for preparing a non-adhesive polyurethane liner mold, carried out according to the following steps:
[0055] (1) Preparation of components A and B of polyurethane lining mold raw materials
[0056] Accurately weigh polyester polyol, polyether polyol, extender, defoamer, catalyst and desiccant according to the following mass parts, and then stir and mix evenly to obtain component A;
[0057] Based on the sum of the mass of polyester polyol and polyether polyol as 100 parts, the mass parts of each component in component A are:
[0058]
[0059] Accurately weigh the compound containing -NCO group and polyether polyol according to the following mass ratio, put it into the container, stir and react at 80-100°C for 2-6h, and after passing the -NCO value test, you can get the following B component;
[0060] The mass parts of each component in the B component are:
[0061] Containing -NCO compound 50 parts
[0062] 30 parts of polyether polyols;
[0063] After ...
Embodiment 2
[0092] Compared with the above-mentioned Example 1, the molar ratio of reactive groups in [OH] / [NCO] was changed from 0.99 to 1.02, so as to achieve the effect described in Example 2 in Table 2 below.
Embodiment 3
[0094] Compared with the above-mentioned Example 1, the molar ratio of the reactive groups in [OH] / [NCO] was changed from 0.99 to 1.0, and the number of parts of phthalic anhydride polyester in the preparation was increased from 20 to 30 parts, and the polyether polyether The number of parts of alcohol 2 was reduced from 30 to 20 parts, thereby achieving the effect described in Example 3 in Table 2 below.
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Abstract
The invention discloses a preparation method of a bonding-free polyurethane lining mold. The preparation method comprises the steps of preparing polyurethane lining mold raw materials, namely, a component A and a component B; preparing a special cleaning agent; horizontally adjusting the surface of a steel mold table; rapidly removing rust on the surface of the steel mold table by using an environment-friendly rust remover; attaching a flow limiting frame edge with a certain height and width to the peripheral edge of the steel mold table; quickly and uniformly flattening the poured raw materials; and controlling the post-curing environment of the material. The bonding strength effect between the prepared polyurethane lining mold and the steel mold table is excellent, the problems that a currently prepared polyurethane lining mold is poor in bonding effect on a rugged steel mold table, and debonding, bulging, tearing, deformation and the like occur in the using process are solved, the service life of the polyurethane lining mold is greatly prolonged, and the polyurethane lining mold can be repeatedly used for 100 times or above.
Description
technical field [0001] The invention relates to the technical field of prefabricated buildings, in particular to a method for preparing an adhesive-free polyurethane lining mold. Background technique [0002] my country's prefabricated construction industry has shown a state of blowout development in recent years under the background of policy promotion and continuous upgrading of construction technology. The technology of preparing prefabricated building concrete modules with polyurethane lining is an important technological innovation in the field of prefabricated buildings. It can quickly prepare large-scale concrete modules with a length of more than 10m, which greatly improves the preparation efficiency and batch-to-batch quality of concrete modules. Stability, and the surface of the module is flat and beautiful, and various surface pattern modifications can be easily added; in addition, the popularization and use of this technology can significantly shorten the constru...
Claims
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