萘系高效減水劑的化學(xué)成分為萘磺酸甲醛縮合物。萘系高效減水劑由工業(yè)萘(或精萘)經(jīng)濃硫酸磺化后用甲醛縮合、液堿中和而成,主要成分是β-萘磺酸甲醛縮合物,硫酸鈉的含量≤30%，屬非引氣型減水劑,其特點是減水率高,增強(qiáng)高,不引氣,適合配制各種早強(qiáng)、高強(qiáng)、蒸養(yǎng)、流態(tài)混凝土。萘系高效減水劑適用于所有鋼筋混凝土和預(yù)應(yīng)力混凝土結(jié)構(gòu),可單獨使用,也可與其他外加劑復(fù)合使用。

The chemical composition of naphthalene based high-efficiency water reducing agents is naphthalene sulfonic acid formaldehyde condensate. The naphthalene series high-efficiency water reducing agent is composed of industrial naphthalene (or refined naphthalene) sulfonated with concentrated sulfuric acid, condensed with formaldehyde, and neutralized with liquid alkali. The main components are β- Naphthalenesulfonic acid formaldehyde condensate, with a sodium sulfate content of ≤ 30%, is a non air entraining water reducing agent. Its characteristics are high water reduction rate, high reinforcement, and no air entrainment. It is suitable for preparing various early strength, high-strength, steam cured, and flow concrete. The naphthalene based high-efficiency water reducing agent is suitable for all reinforced concrete and prestressed concrete structures, and can be used alone or in combination with other admixtures.

萘系高效減水劑的生產(chǎn)工藝及合成方法

Production process and synthesis method of naphthalene based high-efficiency water reducing agent

①原料 萘(煤焦油腦、精萘)、硫酸、甲醛、氫氧化鈉、氧化鈣。

① Raw materials naphthalene (coal tar naphthalene, refined naphthalene), sulfuric acid, formaldehyde, sodium hydroxide, and calcium oxide.

②要生產(chǎn)設(shè)備 磺化反應(yīng)釜、縮合釜、中和槽、板框式過濾機(jī)、噴霧干燥設(shè)備。

② To produce equipment sulfonation reaction kettle, condensation kettle, neutralization tank, plate and frame filter, spray drying equipment.

③配方 配合比見表3-9。

③ The formula mix ratio is shown in Table 3-9.

表3-9 萘系高效減水劑配合比

Table 3-9 Mix proportions of naphthalene based high-efficiency water reducing agents

原 料 名 稱

Raw material name

作 用

Function

質(zhì) 量 份

Quality fraction

萘94%～

Naphthalene 94%~

硫酸92%～

Sulfuric acid 92%~

甲醛30%～

Formaldehyde 30%~

氫氧化鈉(30%溶液

Sodium hydroxide (30% solution)

石灰

lime

水

water

主劑

Main agent

磺化劑

Sulfonating agent

縮合劑

Condensing agent

中和劑

Neutralizing agent

中和劑

Neutralizing agent

適量

appropriate amount

④生產(chǎn)工藝及配制方法 萘系高效減水劑由萘與濃硫酸在160～165℃下,經(jīng)磺化后得到a-萘磺酸和β-萘磺酸,然后在120℃水解,除去a-萘磺酸。β-萘磺酸在酸催化下與甲醛縮合,最后用堿中和得萘磺酸甲醛縮合物粉狀減水劑。

④ Production process and preparation method: A naphthalene based high-efficiency water reducer is obtained by sulfonation of naphthalene and concentrated sulfuric acid at 160-165 ℃ to obtain a-naphthalene sulfonic acid β- Naphthalenesulfonic acid, then hydrolyzed at 120 ℃ to remove a-naphthenesulfonic acid. β- Naphthesulfonic acid condenses with formaldehyde under acid catalysis, and finally neutralizes with alkali to obtain a powdered water reducer of naphthesulfonic acid formaldehyde condensate.