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A kind of polyurethane resin for filling bridge height-adjusting bearings and its preparation method and construction method

A polyurethane resin and height adjustment technology, which is applied in the field of polyurethane resin, can solve the problems of easy mixing unevenness, pump body damage, easy blockage of grouting pumps, etc., and achieve the effect of improving the final strength

Active Publication Date: 2016-08-17
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second is that the viscosity of the filled rubber in the liquid state should be small enough for a long time to meet the delivery requirements of the high-pressure grouting pump. If the viscosity is too high, the grouting pump will be easily blocked and the pump body will be damaged.
The mixing viscosity of polyurethane resin A and B components described in this patent increases rapidly, the mixing time is only 5-10 minutes, the pot life is up to 40 minutes, the curing time is up to 90 minutes, and the mixed material exists in a liquid state with a low viscosity The time is short, the actual construction is easy to block the grouting pump for transmission, and it is also easy to mix unevenly, thus affecting the performance of filled polyurethane

Method used

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  • A kind of polyurethane resin for filling bridge height-adjusting bearings and its preparation method and construction method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with embodiment. The parts mentioned below are all parts by weight.

[0021] Polyurethane resin preparation method:

[0022] Component A: Slowly add polyether with a water content of less than 0.02% and a polyether with a terminal primary hydroxyl group content greater than 70% to isophorone diisocyanate, and react at 85°C for 4 hours to obtain an isocyanate-terminated prepolymer.

[0023] Component B: After fully mixing the aromatic diamine and the viscosity reducer with a water content of less than 0.02%, the component B is obtained.

[0024] Polyurethane resin construction method:

[0025] Mix the A / B components at room temperature for 60 minutes to ensure that they are evenly mixed. When placed for 90 minutes, test its viscosity according to the rotational viscosity test method in GB / T2794-1995. The mixed material was poured into a mold of 100mm×100mm×2mm by a high-pressure pump, and after stan...

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Abstract

The invention discloses a polyurethane resin used for filling a heightening support of a bridge and a preparation method and a construction method thereof. A component A is a prepolymer component and comprises polyether polyol and isophorone Diisocyanate (IPD) in a weight ratio of 100:(14.6-41); a component B is a curing agent component and comprises an aromatic diamine chain extender and a selectively used viscosity reducer in a weight ratio of 100:(0-70.5); the components A and B are mixed in a weight ratio of 100:(7-36) and cured at a room temperature to form polyurethane resin, wherein the polyether polyol is polyether polyol with the content of a terminated primary hydroxyl group of more than 70 percent, polyether trihydric alcohol or a doped mixture thereof; the viscosity of the polyether polyol at a temperature of 25 DEG C is less than 1300 mPa.s; and the number-average molecular weight of the polyether polyol is 1000-6000. After components of the resin are mixed, the stirring time is long, the viscosity is increased slowly, the working life is long, the strength of a condensate is high, and the hardness is moderate.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyurethane resin that can be used to fill bridge height adjustment supports. Background technique [0002] The bridge height adjustment support is a device installed between the bridge and the pier to fill the gap and balance the force on the pier. According to actual needs, there are many ways to adjust the height of bridge height-adjusting bearings, among which the use of filling rubber materials to realize the height adjustment of bearings is a newly developed method of height adjustment. This method is to transport the liquid filling rubber to the high-jump bearing on the pier through a high-pressure grouting pump placed on the ground. After the liquid rubber material solidifies, it becomes a solid filling rubber material with certain properties, which not only has the performance of filling the bearing , It can also slow down the impact force added to the bear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/32C08G18/10C08L75/08E01D19/04E01D21/00
CPCC08G18/10C08G18/4812C08G18/4825C08G18/4829C08G18/6685C08G18/755E01D19/048E01D21/00E01D2101/40C08G18/3868
Inventor 陈战有韦永继王亚萌周文英
Owner LIMING RES INST OF CHEM IND
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