CN101759389B

CN101759389B - Rheologic viscosity reducer and preparation method thereof

Info

Publication number: CN101759389B
Application number: CN 200910247408
Authority: CN
Inventors: 施晓旦; 郭和森; 王养臣
Original assignee: YANZHOU MINGSHENG NEW MATERIAL CO Ltd; Shanghai Dongsheng New Material Co Ltd
Current assignee: Jining Mingsheng New Material Co ltd; Suzhou Shengze Science And Technology Pioneer Park Development Co ltd; Shanghai Dongsheng New Material Co Ltd
Priority date: 2009-12-29
Filing date: 2009-12-29
Publication date: 2012-06-20
Anticipated expiration: 2029-12-29
Also published as: CN101759389A

Abstract

The invention discloses a rheologic viscosity reducer and a preparation method thereof. The rheologic viscosity reducer comprises the following components in parts by weight: 50 parts of smectite powder, 30-50 parts of acrylamide, 0.5-1.5 parts of ammonium persulfate, 0.5-1.5 parts of sodium carbonate and 50-70 parts of water. The smectite powder in the rheologic viscosity reducer is composed of laminated silicate mineral materials which have a special structure; when the emulsion is used for spray-drying, the shearing force of the high-speed atomizer for spray-drying destroys the special structure of the laminated silicate in a reversible way, so that the silicate laminae performs the function of lubricant and reduces the relative viscosity of the emulsion; and thus, the cloud points sprayed by the atomizer are finer, thereby being beneficial to heat exchange, refining the dried colloid powder granules and enhancing the production capacity.

Description

Rheologic viscosity reducer and preparation method thereof

Technical field

The present invention relates to the rheology reduction viscosity auxiliary agent that a kind of redispersable latex powder spraying drying is used.

Background technology

Redispersable latex powder is the main additive of type material cement powder mortar, has been widely used in exterior-wall heat insulation at present, among coating, terrace mortar, all kinds of material of construction of polymer cement-base waterproof coating; The production of redispersable latex powder is flourish; Because the branch latex powder is one and produces latex powder by the emulsion drying again, latex powder is transformed into the process of emulsion during use again, the latex powder particle that therefore requires to produce will have certain fineness; Be beneficial to the redispersion rate of rubber powder; Cutting down the consumption of energy simultaneously also is the purpose that each manufacturing enterprise requires, but owing to receive the solid content of emulsion, influence of various factors such as viscosity; The fineness of the latex powder of producing is at present all limited to, and has also limited the reduction of energy consumption simultaneously.

Summary of the invention

The object of the present invention is to provide a kind of rheologic viscosity reducer and preparation method thereof, to overcome the above-mentioned defective that existing redispersable latex powder spray drying technology exists.

The rheology that the redispersable latex powder spraying drying is used reduces the viscosity auxiliary agent, is made up of the component of following weight part:

50 parts of montmorillonite powders (1200～1600 order)

30～50 parts of acrylic amides

0.5～1.5 part of ammonium persulphate

0.5～1.5 part in yellow soda ash

50～70 parts in water

Montmorillonite powder is the above platy layer silicate of a kind of 80wt% of containing, and bright Yang Tansuangaichang produces by east rising rising sun chemical industry;

Described rheology reduces the preparation method of viscosity auxiliary agent, comprises the steps:

Water is warming up to 75～90 ℃, adds montmorillonite powder, stirred 10～20 minutes; 80～120 rev/mins of rotating speeds add ammonium persulphate and yellow soda ash, then in nitrogen atmosphere; Drip acrylic amide, in 2～3 hours, dropwise, reacted again 1～2 hour; Use weight concentration be 10～15% ammoniacal liquor to regulate pH be 8～9, can obtain product.

The montmorillonite powder that rheology of the present invention reduces in the viscosity auxiliary agent is a platy layer silicate minerals material; These silicate materials are a kind of particular structural, when emulsion when mist is dry, the shearing force of the spray-dired spraying gun that runs up makes the special construction of platy layer silicate by reversible destruction; Consequently the thin slice of silicate has played lubricant; Reduce the relative viscosity of emulsion, made the emulsion cloud point of spraying gun ejection thinner, more helped heat exchange; Make the rubber powder granule that is dried thinner, throughput improves.

Embodiment

Embodiment 1

50 parts of montmorillonite powders (1200 order), 50 parts of deionized waters, 30 parts of acrylic amides, 0.75 part of ammonium persulphate, 0.5 part in yellow soda ash.、

The preparation method is following: in reaction kettle, adds 50 parts of deionized waters, is warming up to 75 ℃, and, add montmorillonite powder (1200 order) 30 parts; Stir 10 minutes (80 rev/mins of rotating speeds), add 0.75 part of ammonium persulphate then, 0.5 part in yellow soda ash feeds nitrogen flooding oxygen, begins to drip acrylic amide; In 2 hours, dropwise, reacted 1 hour again, the use weight concentration is 10% ammoniacal liquor adjusting pH value 8.2, solid content 60.4%; Viscosity 1160mpa.s (25 ℃, Brookfield, the 2# rotor, 60rpm).

Embodiment 2

50 parts of montmorillonite powders (1300 order), 60 parts of deionized waters, 50 parts of acrylic amides, 1 part of ammonium persulphate, 1.5 parts in yellow soda ash.

The preparation method is following: in reaction kettle, add 60 parts of deionized waters, be warming up to 80 ℃, add montmorillonite powder (1300 order) 50 parts, stir 10 minutes (80 rev/mins of rotating speeds); Add 1 part of ammonium persulphate then, 1.5 parts in yellow soda ash feeds nitrogen flooding oxygen, begins to drip acrylic amide; In 3 hours, dropwise, reacted 1 hour again, using with weight concentration is that 15% ammoniacal liquor is regulated pH value 8.7, solid content 62.4%; Viscosity 1200mpa.s (25 ℃, Brookfield, the 2# rotor, 60rpm).

Embodiment 3

50 parts of montmorillonite powders (1400 order), 70 parts of deionized waters, 40 parts of acrylic amides, 1.5 parts of ammonium persulphates, 1 part in yellow soda ash.

The preparation method is following: in reaction kettle, add 70 parts of deionized waters, be warming up to 90 ℃, add montmorillonite powder (1400 order) 50 parts, stir 10 minutes (80 rev/mins of rotating speeds .); Add 1 part of ammonium persulphate then, 1 part in yellow soda ash feeds nitrogen flooding oxygen, begins to drip acrylic amide; In 2.5 hours, dropwise, reacted 1 hour again, using with weight concentration is that 12% ammoniacal liquor is regulated pH value 8.6, solid content 57.1%; Viscosity 1176mpa.s (25 ℃, Brookfield, the 2# rotor, 60rpm).

Embodiment 4

50 parts of montmorillonite powders (1500 order), 55 parts of deionized waters, 40 parts of acrylic amides, 0.5 part of ammonium persulphate, 0.75 part in yellow soda ash

The preparation method is following: in reaction kettle, add 55 parts of deionized waters, be warming up to 85 ℃, add montmorillonite powder (1500 order) 50 parts, stir 10 minutes (80 rev/mins of rotating speeds); Add 0.5 part of ammonium persulphate then, 0.75 part in yellow soda ash feeds nitrogen flooding oxygen, begins to drip acrylic amide; In 3 hours, dropwise, reacted 1 hour again, the use weight concentration is 15% ammoniacal liquor adjusting pH value 8.1, solid content 61.4%; Viscosity 1186mpa.s (25 ℃, Brookfield, the 2# rotor, 60rpm).

Embodiment 5

50 parts of montmorillonite powders (1600 order), 65 parts of deionized waters, 40 parts of acrylic amides, 1.5 parts of ammonium persulphates, 1.25 parts in yellow soda ash, the preparation method is following: in reaction kettle, add 65 parts of deionized waters, be warming up to 90 ℃; Add montmorillonite powder (1600 order) 50 parts, stir 10 minutes (80 rev/mins of rotating speeds), add 1.5 parts of ammonium persulphates then, 1.25 parts in yellow soda ash; Feed nitrogen flooding oxygen, begin to drip acrylic amide, in 2 hours, dropwise, reacted again 1 hour; The use weight concentration is 15% ammoniacal liquor adjusting pH value 8.7, solid content 57.9%, (25 ℃ of viscosity 1207mpa.s; Brookfield, the 2# rotor, 60rpm).

Embodiment 6

50 parts of montmorillonite powders (1200 order), 60 parts of deionized waters, 60 parts of acrylic amides, 1.25 parts of ammonium persulphates, 1.5 parts in yellow soda ash.

The preparation method is following: in reaction kettle, add 50 parts of deionized waters, be warming up to 80 ℃, add montmorillonite powder (1200 order) 50 parts, stir 10 minutes (80 rev/mins of rotating speeds); Add 1.25 parts of ammonium persulphates then, 1.5 parts in yellow soda ash feeds nitrogen flooding oxygen, begins to drip acrylic amide; In 2 hours, dropwise, reacted 1 hour again, the use weight concentration is 10% ammoniacal liquor adjusting pH value 8.3, solid content 61.4%; Viscosity 1283mpa.s (25 ℃, Brookfield, the 2# rotor, 60rpm).

Application implementation example 7

In emulsion, add and carry out spraying drying after 1% rheology reduces the viscosity auxiliary agent; The result sees table 1.

Comparative sample: do not add rheology in the emulsion and reduce the viscosity auxiliary agent.The result sees table 1.

Experimental installation is a LPG-5 type drying machine with centrifugal spray, and Jiangsu model crowd drying plant factory makes;

Emulsion is a redispersable latex powder 160A type special emulsion, and Shanghai dongsheng New Materials Co., Ltd produces; Solid content is 50.3%, and viscosity is 350mp.s; Spraying drying adopts redispersable latex powder conventional production process spraying drying; Testing apparatus 100 orders, 150 mesh standard sieves.

Table 1

Test item	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5	Embodiment 6	Application implementation example 7
								The 100 orders rate % that looks over so as to check	99.5	99.3	99.3	99.2	99.1	99.2	98.4
The 150 orders rate % that looks over so as to check	85.1	87.2	88.9	86.1	87.7	88.3	76.1
								Turnout (kilogram)/(hour)	501	512	514	506	498	496	459
Steam consumption quantity (kilogram)/(kilogram)	3.98	3.87	3.78	3.91	4.01	4.11	4.57

The data of measuring from table 1 can obtain conclusion; The latex powder emulsion is carried out spraying drying after adding 1% rheology reduction viscosity auxiliary agent of the present invention; The particle of latex powder is thinner than the spray-dired rubber powder granule of emulsion that does not add rheology reduction viscosity auxiliary agent, and throughput improves energy consumption decline.

Claims

1. rheologic viscosity reducer is characterized in that, is made up of the component of following weight part:

2. the preparation method of the described rheologic viscosity reducer of claim 1 is characterized in that, comprises the steps: water is warming up to 75～90 ℃, adds montmorillonite powder; Stirred 10～20 minutes, 80～120 rev/mins of rotating speeds add ammonium persulphate and yellow soda ash then; In nitrogen atmosphere, drip acrylic amide, in 2～3 hours, dropwise; Reacted 1～2 hour, using ammoniacal liquor to regulate pH is 8～9, can obtain product again.