CN118325379A - Double-component solvent-free modified polyurethane elastic putty and preparation method thereof - Google Patents
Double-component solvent-free modified polyurethane elastic putty and preparation method thereof Download PDFInfo
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- CN118325379A CN118325379A CN202410497967.9A CN202410497967A CN118325379A CN 118325379 A CN118325379 A CN 118325379A CN 202410497967 A CN202410497967 A CN 202410497967A CN 118325379 A CN118325379 A CN 118325379A
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- modified polyurethane
- polyurethane elastic
- free modified
- elastic putty
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 32
- 239000004814 polyurethane Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000012948 isocyanate Substances 0.000 claims abstract description 21
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 21
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 35
- 229920000570 polyether Polymers 0.000 claims description 35
- 229920005862 polyol Polymers 0.000 claims description 35
- 150000003077 polyols Chemical class 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 18
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000002270 dispersing agent Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 239000003085 diluting agent Substances 0.000 claims description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical group [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical group CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 16
- 239000004567 concrete Substances 0.000 abstract description 10
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000009736 wetting Methods 0.000 abstract description 2
- 239000004593 Epoxy Substances 0.000 description 6
- 229920002396 Polyurea Polymers 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 150000001412 amines Chemical class 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- HIFVAOIJYDXIJG-UHFFFAOYSA-N benzylbenzene;isocyanic acid Chemical class N=C=O.N=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 HIFVAOIJYDXIJG-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920005871 reactive polyether polyol Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000012745 toughening agent Substances 0.000 description 1
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- Sealing Material Composition (AREA)
Abstract
The invention belongs to the technical field of building materials, and discloses a bi-component solvent-free modified polyurethane elastic putty and a preparation method thereof. The solid content of the bi-component solvent-free modified polyurethane elastic putty is more than or equal to 98%, the putty is environment-friendly and comprises A, B components, wherein the component A is liquefied diphenylmethane diisocyanate, the component B can increase the elasticity of the putty by adding the hydroxyl-terminated isocyanate prepolymer with high molecular weight, prolong the operable time, increase the wetting time with a base material, improve the bonding strength and the peeling strength with the base material, ensure that the breaking elongation is more than or equal to 70%, and the cured coating is compact and does not shrink, has a certain crack following property and is not easy to crack when being applied to concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to the field of elastic hole sealing putty special for spray polyurea, and more particularly relates to a bi-component solvent-free modified polyurethane elastic putty and a preparation method thereof.
Background
The spray-coated polyurea elastomer coating is a waterproof and anticorrosive material which is solvent-free, high-performance and fast-curing, and forms a continuous, compact and seamless coating after curing. In order to avoid the influence of defects such as holes and cracks on the surface of the concrete on the sprayed polyurea and prevent the polyurea coating from generating pinholes, bubbles and the like, the concrete base layer needs to be treated during construction. Aiming at the defects of holes, cracks and the like on the surface of the concrete, the surface of the base layer needs to be blocked by putty.
The common putty for polyurea in the market at present is water-based polymer mortar and epoxy putty. The aqueous polymer mortar putty is cement fine sand and aqueous emulsion, and the surface of the cement fine sand and aqueous emulsion has the characteristic of concrete after film formation, and can seal holes on the surface of the concrete, but the cement fine sand and aqueous emulsion have the characteristic of the surface of the concrete, so the cement fine sand putty is a porous material, is not compact, and is easy to cause pinhole bubbles when being sprayed with polyurea. The epoxy putty has good hole sealing and leveling effects on concrete, but because of the high brittleness, the epoxy putty is easy to crack along with the deformation of the concrete, so that the coating cracks and shells, and the solid content of the epoxy putty is generally 60-70%, so that the epoxy putty is not environment-friendly.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a bi-component solvent-free modified polyurethane elastic putty and a preparation method thereof. The solid content of the bi-component solvent-free modified polyurethane elastic putty is more than or equal to 98%, the bi-component solvent-free modified polyurethane elastic putty is environment-friendly and comprises A, B, wherein the component B can increase the elasticity of the bi-component solvent-free modified polyurethane elastic putty by adding the hydroxyl-terminated isocyanate prepolymer with high molecular weight, prolong the operable time, increase the wetting time with a base material, improve the bonding strength and the peeling strength with the base material, ensure that the cured coating is compact and does not shrink, has a certain crack following property and is not easy to crack when applied to concrete.
To achieve the purpose of the invention, the two-component solvent-free modified polyurethane elastic putty comprises A, B components, wherein the A component is liquefied diphenylmethane diisocyanate, and the B component comprises the following components in parts by mass:
preferably, in some embodiments of the present invention, the B component comprises, in parts by weight:
further, in some embodiments of the invention, the dispersant is BYK104S, the anti-settling agent is BYK410, the powder is ultra-fine barium sulfate, and the water absorbing agent is a 3A molecular sieve activated powder.
Further, in some embodiments of the invention, the A, B component is present in a mass ratio of 0.9 to 1.5:1, a step of; preferably 0.8-1.2:1.
Further, in some embodiments of the present invention, the preparation method of the B component is: mixing and stirring the high-activity polyether polyol, the hydroxyl-terminated isocyanate prepolymer, the dispersing agent, the anti-settling agent, the powder, the water absorbent and the silane coupling agent, uniformly dispersing, filtering, discharging, sealing and preserving.
Further, in some embodiments of the present invention, the hydroxyl-terminated isocyanate prepolymer comprises, in parts by weight:
2-8 parts of diphenylmethane diisocyanate
82-98 Parts of polyether polyol
0-10 Parts of reactive diluent.
Further, in some embodiments of the invention, the diphenylmethane diisocyanate is a mixture comprising 45 to 55% 4, 4-diphenylmethane diisocyanate and 45 to 55% 2, 4-diphenylmethane diisocyanate.
Further, in some embodiments of the invention, the polyether polyol is a polyether polyol having a molecular weight of 1000 to 3000.
Further, in some embodiments of the invention, the reactive diluent is propylene carbonate PC.
Further, in some embodiments of the present invention, the method of preparing the hydroxyl-terminated isocyanate prepolymer is: firstly, adding polyether polyol into a reaction container, heating to 110-130 ℃, carrying out vacuum dehydration, cooling to 40-50 ℃, slowly adding diphenylmethane diisocyanate, heating to 75+/-3 ℃ after the addition, carrying out heat preservation, adding an active diluent when the content of isocyanate is detected to be 0 by sampling, continuing stirring for 20-30 minutes, cooling to 40-50 ℃, filtering, discharging, and carrying out sealed preservation.
On the other hand, the invention also provides a preparation method of the two-component solvent-free modified polyurethane elastic putty, which comprises the following steps:
(1) Preparing a hydroxyl-terminated isocyanate prepolymer;
(2) And (3) preparing a component B: mixing and stirring high-activity polyether polyol, a dispersing agent, an anti-settling agent, powder, a water absorbent, a silane coupling agent and the hydroxyl-terminated isocyanate prepolymer obtained in the step (1), uniformly dispersing, filtering, discharging, and sealing and preserving;
(3) And mixing A, B parts according to the required proportion.
Compared with the prior art, the invention has the following advantages:
According to the invention, the hydroxyl-terminated isocyanate prepolymer is prepared as the toughening agent, so that the elasticity of a formula system is improved, the high-activity polyether polyol is added to improve the reactivity of the whole component B, the conditions of slow curing at normal temperature, incomplete curing and low-temperature non-curing are avoided, and the sensitivity of the added catalyst to temperature and humidity is avoided. Meanwhile, the low-viscosity modified diphenylmethane diisocyanate is matched, so that the viscosity of the whole formula system is moderate, and the formula system is suitable for construction operation.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is intended to be illustrative of the invention and not restrictive.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when ranges of "1 to 5" are disclosed, the described ranges should be construed to include ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
The indefinite articles "a" and "an" preceding an element or component of the invention are not limited to the requirement (i.e. the number of occurrences) of the element or component. Thus, the use of "a" or "an" should be interpreted as including one or at least one, and the singular reference of an element or component includes the plural reference unless the amount clearly dictates otherwise.
Furthermore, the descriptions of the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., described below mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. The technical features of the respective embodiments of the present invention may be combined with each other as long as they do not collide with each other.
In the examples of the present invention, the A-component is liquefied diphenylmethane diisocyanate unless otherwise specified.
The hydroxyl-terminated isocyanate prepolymer comprises the following components in percentage by mass:
diphenylmethane diisocyanate 5%
Polyether polyol 90%
Reactive diluent 5%
The preparation method comprises the following steps: firstly, adding polyether polyol into a reaction bottle, heating to 120 ℃, carrying out vacuum dehydration (vacuum degree of-0.08 Mpa) for 2 hours, cooling to 45 ℃, slowly adding diphenylmethane diisocyanate, heating to 75+/-3 ℃ after the addition is finished, preserving heat, adding an active diluent when the content of isocyanate is detected to be 0 by sampling, continuing stirring for 30 minutes, cooling, filtering, discharging, and sealing and preserving.
Wherein the polyether polyol is a polyether polyol with a molecular weight of 2000; diphenylmethane diisocyanate was a mixture comprising about 50% 4, 4-diphenylmethane diisocyanate and 50% 2, 4-diphenylmethane diisocyanate; the reactive diluent is propylene carbonate PC.
Example 1
The component B comprises the following components in percentage by mass:
the preparation method of the component B comprises the following steps: the materials are added into a stirring tank according to the proportion, and after being dispersed evenly at high speed, the materials are filtered and discharged and stored in a sealing way.
The high-activity polyether polyol is high primary hydroxyl polyether polyol or amine is used as an initiator (the performances of the modified polyurethane elastic putty finally obtained by using the two polyether polyols are not obviously different), the dispersing agent is BYK104S, the anti-settling agent is BYK410, the powder is superfine barium sulfate, and the water absorbent is 3A molecular sieve activated powder.
A, B components were mixed according to 1.5:1, and fully and uniformly mixing to obtain the double-component solvent-free modified polyurethane elastic putty.
Example 2
The component B comprises the following components in percentage by mass:
the preparation method of the component B comprises the following steps: the materials are added into a stirring tank according to the proportion, and after being dispersed evenly at high speed, the materials are filtered and discharged and stored in a sealing way.
The high-activity polyether polyol is high primary hydroxyl polyether polyol or amine is used as an initiator (the performances of the modified polyurethane elastic putty finally obtained by using the two polyether polyols are not obviously different), the dispersing agent is BYK104S, the anti-settling agent is BYK410, the powder is superfine barium sulfate, and the water absorbent is 3A molecular sieve activated powder.
A, B components were mixed according to 1.3:1, and fully and uniformly mixing to obtain the double-component solvent-free modified polyurethane elastic putty.
Example 3
The component B comprises the following components in percentage by mass:
the preparation method of the component B comprises the following steps: the materials are added into a stirring tank according to the proportion, and after being dispersed evenly at high speed, the materials are filtered and discharged and stored in a sealing way.
The high-activity polyether polyol is high primary hydroxyl polyether polyol or amine is used as an initiator (the performances of the modified polyurethane elastic putty finally obtained by using the two polyether polyols are not obviously different), the dispersing agent is BYK104S, the anti-settling agent is BYK410, the powder is superfine barium sulfate, and the water absorbent is 3A molecular sieve activated powder.
A, B components were mixed according to 1.3:1, and fully and uniformly mixing to obtain the double-component solvent-free modified polyurethane elastic putty.
Example 4
The component B comprises the following components in percentage by mass:
the preparation method of the component B comprises the following steps: the materials are added into a stirring tank according to the proportion, and after being dispersed evenly at high speed, the materials are filtered and discharged and stored in a sealing way.
The high-activity polyether polyol is high primary hydroxyl polyether polyol or amine is used as an initiator (the performances of the modified polyurethane elastic putty finally obtained by using the two polyether polyols are not obviously different), the dispersing agent is BYK104S, the anti-settling agent is BYK410, the powder is superfine barium sulfate, and the water absorbent is 3A molecular sieve activated powder.
A, B components were mixed according to 1:1, and fully and uniformly mixing to obtain the double-component solvent-free modified polyurethane elastic putty.
Example 5
The component B comprises the following components in percentage by mass:
the preparation method of the component B comprises the following steps: the materials are added into a stirring tank according to the proportion, and after being dispersed evenly at high speed, the materials are filtered and discharged and stored in a sealing way.
The high-activity polyether polyol is high primary hydroxyl polyether polyol or amine is used as an initiator (the performances of the modified polyurethane elastic putty finally obtained by using the two polyether polyols are not obviously different), the dispersing agent is BYK104S, the anti-settling agent is BYK410, the powder is superfine barium sulfate, and the water absorbent is 3A molecular sieve activated powder.
And preparing A, B components according to the weight ratio of 0.9:1, and fully and uniformly mixing to obtain the double-component solvent-free modified polyurethane elastic putty.
The properties of the two-component solvent-free modified polyurethane elastic putty obtained in the above examples were examined and compared with those of epoxy putty, as shown in the following table.
The hydroxyl-terminated isocyanate prepolymer plays a role in toughening in the formula system, and the high-activity polyether polyol has high functionality, so that the strength and the drying speed of the formula system are improved. When the curing agent of the component A is fixed and the isocyanate index is 1.1, the surface drying time and the real drying time are prolonged and the breaking elongation is increased along with the increase of the hydroxyl-terminated isocyanate prepolymer when the ratio of the high-activity polyether polyol to the isocyanate-terminated prepolymer is 4.8-1.32:1; the bond strength and peel strength increase and decrease. The reason for the decrease is that as the high activity polyether polyol decreases, the hydroxyl terminated prepolymer increases, the crosslinking density of the formulation system is low, the strength decreases, the water absorption increases, and the adhesive strength and the peel strength decrease. An appropriate value is reached when the ratio of the highly reactive polyether polyol to the hydroxyl-terminated isocyanate prepolymer is 1.9:1 (example 4).
It will be readily appreciated by those skilled in the art that the foregoing is merely illustrative of the present invention and is not intended to limit the invention, but any modifications, equivalents, improvements or the like which fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The two-component solvent-free modified polyurethane elastic putty is characterized by comprising A, B components, wherein the A component is liquefied diphenylmethane diisocyanate, and the B component comprises the following components in parts by mass:
2. The two-component solvent-free modified polyurethane elastic putty as set forth in claim 1, wherein said B component comprises, in parts by weight:
3. The two-component solvent-free modified polyurethane elastic putty according to claim 1, wherein the dispersing agent is BYK104S, the anti-settling agent is BYK410, the powder is superfine barium sulfate, and the water absorbing agent is 3A molecular sieve activated powder.
4. The two-component solvent-free modified polyurethane elastic putty as set forth in claim 1, wherein said A, B components have a mass ratio of 0.9-1.5:1, a step of; preferably 0.8-1.2:1.
5. The two-component solvent-free modified polyurethane elastic putty as set forth in claim 1, wherein said B component is prepared by the method of: mixing and stirring the high-activity polyether polyol, the hydroxyl-terminated isocyanate prepolymer, the dispersing agent, the anti-settling agent, the powder, the water absorbent and the silane coupling agent, uniformly dispersing, filtering, discharging, sealing and preserving.
6. The two-component solvent-free modified polyurethane elastic putty as set forth in claim 1, wherein said hydroxyl-terminated isocyanate prepolymer comprises, in parts by weight:
2-8 parts of diphenylmethane diisocyanate
82-98 Parts of polyether polyol
0-10 Parts of reactive diluent.
7. The two-part solvent-free modified polyurethane elastic putty according to claim 6, characterized in that the diphenylmethane diisocyanate is a mixture comprising 45-55% of 4, 4-diphenylmethane diisocyanate and 45-55% of 2, 4-diphenylmethane diisocyanate.
8. The two-component solvent-free modified polyurethane elastic putty as set forth in claim 6, wherein said polyether polyol is a polyether polyol having a molecular weight of 1000-3000; preferably, the reactive diluent is propylene carbonate.
9. The two-component solvent-free modified polyurethane elastic putty as set forth in claim 6, characterized in that said hydroxyl-terminated isocyanate prepolymer is prepared by the process of: firstly, adding polyether polyol into a reaction container, heating to 110-130 ℃, carrying out vacuum dehydration, cooling to 40-50 ℃, slowly adding diphenylmethane diisocyanate, heating to 75+/-3 ℃ after the addition, carrying out heat preservation, adding an active diluent when the content of isocyanate is detected to be 0 by sampling, continuing stirring for 20-30 minutes, cooling to 40-50 ℃, filtering, discharging, and carrying out sealed preservation.
10. A process for preparing the two-component solvent-free modified polyurethane elastic putty as set forth in any one of claims 1-9, said process comprising the steps of:
(1) Preparing a hydroxyl-terminated isocyanate prepolymer;
(2) And (3) preparing a component B: mixing and stirring high-activity polyether polyol, a dispersing agent, an anti-settling agent, powder, a water absorbent, a silane coupling agent and the hydroxyl-terminated isocyanate prepolymer obtained in the step (1), uniformly dispersing, filtering, discharging, and sealing and preserving;
(3) And mixing A, B parts according to the required proportion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410497967.9A CN118325379A (en) | 2024-04-24 | 2024-04-24 | Double-component solvent-free modified polyurethane elastic putty and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410497967.9A CN118325379A (en) | 2024-04-24 | 2024-04-24 | Double-component solvent-free modified polyurethane elastic putty and preparation method thereof |
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| Publication Number | Publication Date |
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| CN118325379A true CN118325379A (en) | 2024-07-12 |
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| CN202410497967.9A Pending CN118325379A (en) | 2024-04-24 | 2024-04-24 | Double-component solvent-free modified polyurethane elastic putty and preparation method thereof |
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| Country | Link |
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| CN (1) | CN118325379A (en) |
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