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Nano-hybrid concrete chemical admixture for chloride invasion resistance consisting of layered double hydroxide/polyurethane copolymer

A hydroxide and concrete technology, which is applied in the field of concrete chemical admixtures, can solve the problems of unused, etc., and achieve the effects of enhancing machinability, high water-reducing capacity, and improving slump retention

Inactive Publication Date: 2012-04-25
SILKROAD C&T
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, as described in previous patent publications and applications, layered double hydroxides have been used in a variety of different fields, including polymer resins, catalysts, filters, and biomimetic applications, but never for applications such as concrete. Classes in the field of building materials

Method used

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  • Nano-hybrid concrete chemical admixture for chloride invasion resistance consisting of layered double hydroxide/polyurethane copolymer
  • Nano-hybrid concrete chemical admixture for chloride invasion resistance consisting of layered double hydroxide/polyurethane copolymer
  • Nano-hybrid concrete chemical admixture for chloride invasion resistance consisting of layered double hydroxide/polyurethane copolymer

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preparation example Construction

[0107] In the preparation of the polymer, the amount of the polymerization initiator can be determined according to methods known in the art.

[0108] In addition, a reducing agent can further be used as a promoter (f). As reducing agents, sodium bisulfite, sodium sulfite, sodium formaldehyde sulfoxylate, potassium persulfate or ascorbic acid can be used in combination with amines such as ethylenediamine, sodium edetate and glycine. The amount of reducing agent can be appropriately controlled by methods known in the art.

[0109] Chain transfer agents may be used alone or in combination, if desired. Those skilled in the art can appropriately control the amount of the chain transfer agent.

[0110] In the layered double hydroxide of the nano-hybrid chemical admixture and the polyurethane copolymer, the polyurethane copolymer is present in an amount of 50 to 95 wt % based on the total weight of the concrete admixture. Within the above range, the anionic absorbent present in t...

Embodiment 1

[0142] 1. Preparation of layered double hydroxide

[0143] Mg(NO 3 ) 2 ·6H 2 O (102 parts) and Al (NO 3 ) 3 9H 2 O (75 parts) was dissolved in standard water and the resulting solution was titrated to pH 9-10 with sodium nitrite in NaOH (14 parts). The resulting suspension was stirred at 100°C for 12 hours and unreacted salts were removed by washing. Finally the suspension was freezed and dried to obtain the layered double hydroxide.

[0144] 2. Preparation of polyurethane copolymer

[0145] In this method, 285 parts of distilled water are put into a 1L glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen inlet tube and a reflux condenser. The reactor was purged with nitrogen while stirring, and heated to 80°C under a nitrogen atmosphere. After stirring, a solution comprising 270 parts of unsaturated poly(meth)oxyalkylene urethane compound (adding 6 mol of urethane derivative-oxyalkylene), 55 parts of methacrylic acid and 50 parts of...

Embodiment 2 to Embodiment 5

[0150] A polyurethane copolymer was prepared in the same manner as in Example 1 except that the monomer components shown in Table 1 below were used instead of the monomer components shown in Example 1. Also combined with layered double hydroxide in the same manner as in Example 1 to obtain concrete chemical admixtures S-2 to S-5, respectively.

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Abstract

The present invention relates to a chloride penetration resistant nano-hybrid concrete chemical admixture comprising layered double hydroxide and polyurethane copolymer. More specifically, nano-hybrid concrete chemical admixture obtained by combining the two compounds at a nano-scale, the layered double hydroxide which exhibits resistance to chloride penetration, and polyurethane copolymer which entails an excellent water reducing ability, durability and workability. In addition, the inorganic / organic hybrid material described herein exhibits high water reducing ability, improved resistance to chloride penetration, and thus can be used as chloride penetration resistant concrete chemical admixture for marine concretes.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2010-0071789 filed with the Korean Intellectual Property Office on Jul. 26, 2010, the entire contents of which are hereby incorporated by reference. technical field [0002] The invention relates to a nano-hybrid chemical admixture composed of a layered double hydroxide / polyurethane copolymer for resisting chloride intrusion. More specifically, the present invention relates to a concrete chemical admixture composed of nano-hybrid layered double hydroxide (a) and polyurethane copolymer (b) prepared using nano-hybrid technology, wherein the anti-chloride intrusion The concrete chemical admixture consists of 5 to 50 wt% of layered double hydroxide (a) and 50 to 95 wt% of polyurethane copolymer (b). Background technique [0003] Concrete chemical admixtures are commonly used as water reducers and plasticizers in concrete compositions such as grout, mortar, and concrete, which are essential for forming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C08F216/14C08F220/36C08F220/06C08F220/48C04B103/61
CPCC04B40/0039C04B2111/26C04B28/02C04B22/06C04B24/282C04B22/085C04B22/16
Inventor 茶哲龙朴光永崔泳国张明煜黄圣勋
Owner SILKROAD C&T
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