阅读说明：本技术 一种粘接能力强的单组分聚氨酯发泡胶及其制备方法 (Single-component polyurethane foaming adhesive with strong bonding capability and preparation method thereof ) 是由 钟小芳 徐世林 李光赋 于 2021-11-12 设计创作，主要内容包括：本发明公开了一种粘接能力强的单组分聚氨酯发泡胶及其制备方法,属于聚氨酯发泡胶技术领域。其按重量百分比计,包括1～5%的松香树脂、1～5%的聚醚多元醇、1～5%的氨基树脂、15～35%的组合料树脂、30～52%的溶剂、18～28%的异氰酸酯和0.02～0.4%的催化剂,所述组合料树脂为再生料合成的聚酯或聚醚多元醇。本发明具有降低产品生产成本、提高产品发泡高度和粘接能力的优点。(The invention discloses a single-component polyurethane foaming adhesive with strong bonding capability and a preparation method thereof, belonging to the technical field of polyurethane foaming adhesives. The resin comprises, by weight, 1-5% of rosin resin, 1-5% of polyether polyol, 1-5% of amino resin, 15-35% of combined material resin, 30-52% of solvent, 18-28% of isocyanate and 0.02-0.4% of catalyst, wherein the combined material resin is polyester or polyether polyol synthesized by reclaimed materials. The invention has the advantages of reducing the production cost of the product and improving the foaming height and the bonding capability of the product.)

1. A single-component polyurethane foaming adhesive with strong bonding capability is characterized in that: the resin comprises, by weight, 1-5% of rosin resin, 1-5% of polyether polyol, 1-5% of amino resin, 15-35% of combined material resin, 30-52% of solvent, 18-28% of isocyanate and 0.02-0.4% of catalyst, wherein the combined material resin is polyester or polyether polyol synthesized by reclaimed materials.

2. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the hydroxyl value of the polyether polyol is 30-38 mgKOH/g, the acid value is less than or equal to 0.1mgKOH/g, and the functionality is 3.

3. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the hydroxyl value of the combined material resin is 30-60 mgKOH/g, and the acid value is less than or equal to 3 mgKOH/g.

4. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the amino resin is isobutyl ether amino resin, the acid value of the amino resin is less than or equal to 0.1mgKOH/g, the solid content is 56-68%, and the tolerance is 7-12.

5. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the rosin resin is C₉Rosin resin, rosin 424, or both.

6. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the solvent is dichloromethane.

7. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the catalyst is one or two of dimorpholine and organic tin catalysts.

8. The strong-adhesion one-component polyurethane foam adhesive as claimed in claim 1, wherein: the catalyst comprises, by weight, 0.01-0.2% of dimorpholine and 0.01-0.2% of an organotin catalyst.

9. A method for preparing the one-component polyurethane foam adhesive with strong bonding capability according to any one of claims 1 to 8, which is characterized in that: weighing raw materials in each weight proportion, dissolving rosin resin in a solvent, adding polyether glycol, amino resin and combined material resin, stirring uniformly, continuing adding isocyanate, stirring uniformly, then adding a catalyst, stirring uniformly and filtering to obtain the modified rosin ester.

Technical Field

The invention relates to a single-component polyurethane foaming adhesive with strong bonding capability and a preparation method thereof, belonging to the technical field of polyurethane foaming adhesives.

Background

The polyurethane foaming glue is a product formed by cross-combining an aerosol technology and a polyurethane foam technology, and is characterized in that a polyurethane prepolymer, a foaming agent, a catalyst and other components are filled in a pressure-resistant aerosol can, and when the material is sprayed out of the aerosol can, the foam-shaped polyurethane material can rapidly expand and carry out curing reaction with moisture in the air to form foam. Because the polyurethane foaming glue has higher adhesiveness to common building materials, the polyurethane foaming glue is widely applied to the aspects of sealing, plugging, filling gaps, filling joints, fixing, bonding, heat preservation, sound insulation and the like of buildings, doors and windows and the like.

In the prior art, the single-component polyurethane foaming adhesive is usually prepared by reacting polyester polyol resin, polyether polyol resin and the like with isocyanate and then adding other auxiliaries to form a foaming adhesive product, the preparation cost of the polyurethane foaming adhesive is relatively high, the content ratio of polyester and polyether polyol resin in the raw materials of the polyurethane foaming adhesive is reduced, and when a substitute is added, the bonding capability and the foaming height of the single-component polyurethane foaming adhesive are reduced, so that the use performance of the polyurethane foaming adhesive is influenced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the single-component polyurethane foaming adhesive with low cost, good foaming height and strong bonding capability and the preparation method thereof.

The purpose of the invention is realized by the following technical scheme: the single-component polyurethane foaming adhesive with strong bonding capability comprises, by weight, 1-5% of rosin resin, 1-5% of polyether polyol, 1-5% of amino resin, 15-35% of combined material resin, 30-52% of solvent, 18-28% of isocyanate and 0.02-0.4% of catalyst, wherein the combined material resin is polyester or polyether polyol synthesized by reclaimed materials.

Further, the hydroxyl value of the polyether polyol is 30-38 mgKOH/g, the acid value is less than or equal to 0.1mgKOH/g, and the functionality is 3.

Furthermore, the hydroxyl value of the combined material resin is 30-60 mgKOH/g, and the acid value is less than or equal to 3 mgKOH/g.

Further, the amino resin is isobutyl ether amino resin, the acid value of the amino resin is less than or equal to 0.1mgKOH/g, the solid content is 56-68%, and the tolerance is 7-12.

Further, the rosin resin is C₉Rosin resin, rosin 424, or both.

Further, the solvent is dichloromethane.

Further, the catalyst is one or two of dimorpholine and organic tin catalysts.

Further, the catalyst comprises, by weight, 0.01-0.2% of dimorpholine and 0.01-0.2% of an organotin catalyst.

The invention also provides a preparation method of the single-component polyurethane foaming adhesive with strong bonding capability, which comprises the steps of weighing raw materials in each weight proportion, dissolving rosin resin in a solvent, adding polyether glycol, amino resin and combined material resin, continuously adding isocyanate after stirring uniformly, adding a catalyst, stirring uniformly and filtering to obtain the single-component polyurethane foaming adhesive.

The invention has the beneficial effects that:

by compounding the rosin resin, the amino resin, the combined material resin and the polyether polyol in the formula, the consumption of the polyether polyol resin in the existing formula is reduced, and the cost of the prepared polyurethane foam adhesive is favorably reduced. The composite resin is polyester or polyether polyol synthesized by taking waste bottle flakes and the like as main raw materials, the price of the composite resin is obviously lower than that of polyether polyol resin, hydroxyl capable of reacting with-NCO groups is contained, polyurethane prepolymer with isocyanate groups as end groups is obtained, and the wetting capacity of polyurethane foaming glue is improved by matching with the polyether polyol. Meanwhile, the amino group in the amino resin has higher reaction activity with the isocyanic acid radical, can react with the isocyanic acid radical at lower temperature to generate a crosslinking structure such as biuret and the like, and is compounded with the rosin resin, so that the reaction condition of polyurethane generated by a polyurethane prepolymer generated by the combined material resin is favorably reduced, the foaming height and the bonding capacity of the single-component polyurethane foam adhesive are improved, and the polyurethane foam adhesive prepared by adopting a formula with more combined material resin and less polyether polyol still has good foaming and bonding capacities. The preparation method is simple, the processing efficiency is high, the requirement on equipment is low, and the amount of the prepared single-component polyurethane foaming colloid is stable.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

The invention provides a technical scheme that: the single-component polyurethane foaming adhesive with strong bonding capability comprises, by weight, 1-5% of rosin resin, 1-5% of polyether polyol, 1-5% of amino resin, 15-35% of combined material resin, 30-52% of solvent, 18-28% of isocyanate and 0.02-0.4% of catalyst. Wherein, the rosin resin adopted in the formula of the invention is C₉Rosin resin, rosin 424, both of which are common commercial products. The polyether polyol is a commercial product with a hydroxyl value of 30-38 mgKOH/g, an acid value of less than or equal to 0.1mgKOH/g and a functionality of 3. The combined material resin is polyester or polyether polyol synthesized by reclaimed materials, is polyester or polyether polyol synthesized by taking reclaimed materials such as waste bottle flakes and the like as main raw materials, can replace the polyester or polyether polyol to react with isocyanate, and can be selected from the combined material resin with a hydroxyl value of 30-60 mgKOH/g and an acid value of less than or equal to 3 mgKOH/g. The amino resin can be isobutyl ether amino resin special for oily paint, and a commercially available amino resin product with an acid value of less than or equal to 0.1mgKOH/g, a solid content of 56-68% and a tolerance of 7-12 is selected. The solvent can adopt volatile dichloromethane with lower boiling point, has the characteristics of nonflammability, lower toxicity and the like, and can also be used as a foaming agent when the polyurethane foaming adhesive is subjected to hot pressing. The isocyanate may be one of diphenylmethane diisocyanate, tolylene diisocyanate, etc. The catalyst can adopt any one or two of dimorpholine and organic tin catalyst, preferably, the catalyst comprises 0.01-0.2% of dimorpholine and 0.01-0.2% of organic tin catalyst by weight percentage.

The invention also provides a preparation method of the single-component polyurethane foaming adhesive with strong bonding capability, which comprises the steps of weighing raw materials in weight proportion according to the formula, dissolving rosin resin in a solvent, adding polyether polyol, amino resin and combined material resin, stirring uniformly, continuing adding isocyanate, stirring uniformly, adding a catalyst, stirring uniformly and filtering to obtain the single-component polyurethane foaming adhesive.

Example one

This example provides a one-component polyurethane foam with strong adhesion, which comprises, by weight, 1% of rosin resin, 35% of dichloromethane, 2.7% of polyether polyol, 1% of amino resin, 35% of combined resin, 25% of isocyanate, 0.1% of dimorpholine, and 0.2% of organotin catalyst. The rosin resin adopted in this embodiment is rosin resin 424, the polyether polyol is polyether polyol 330N, the amino resin is amino resin YC-017, the combined material resin is lange 45# combined material resin, the isocyanate is diphenylmethane diisocyanate, the dimorpholine is dimorpholine CY204, and the organotin catalyst is organotin catalyst T-12.

The preparation method of the single-component polyurethane foaming adhesive comprises the following steps: weighing the raw materials according to the weight percentage, dissolving the rosin resin in dichloromethane, adding the polyether polyol, the amino resin and the combined material resin, uniformly stirring, adding the isocyanate, uniformly stirring, adding the dimorpholine and the organic tin catalyst, uniformly stirring, and filtering by using a 120-mesh filter screen to obtain the modified rosin ester.

Example two

The difference between the present embodiment and the first embodiment is mainly as follows: the raw material formulation of this example comprises, by weight, 3.8% of rosin resin, 30% of methylene chloride, 1% of polyether polyol, 5% of amino resin, 32% of combined material resin, 28% of isocyanate, 0.01% of dimorpholine, and 0.19% of organotin catalyst. The rosin resin used in this example was C₉Rosin resin.

EXAMPLE III

The difference between the present embodiment and the first embodiment is mainly as follows: the raw material formulation of this example comprises, by weight, 5% of rosin resin, 52% of dichloromethane, 5% of polyether polyol, 4.8% of amino resin, 15% of combined material resin, 18% of isocyanate, 0.19% of dimorpholine, and 0.01% of organotin catalyst.

Example four

The difference between the present embodiment and the first embodiment is mainly as follows: the raw material formulation of this example comprises, by weight, 2% of rosin resin, 35% of dichloromethane, 3% of polyether polyol, 3% of amino resin, 31.7% of combined material resin, 25% of isocyanate, 0.2% of dimorpholine, and 0.1% of organotin catalyst.

EXAMPLE five

The difference between the present embodiment and the first embodiment is mainly as follows: the raw material formulation of this example comprises, by weight, 2% of rosin resin, 35% of dichloromethane, 3% of polyether polyol, 3% of amino resin, 31.9% of combined material resin, 25% of isocyanate, 0.05% of dimorpholine, and 0.05% of organotin catalyst. The rosin resin used in this example was C₉Rosin resin.

Comparative example 1

The comparative example provides a single-component polyurethane foam adhesive, and the raw material formula comprises, by weight, 35% of dichloromethane, 4% of polyether polyol, 35.9% of combined material resin, 25% of isocyanate, 0.05% of dimorpholine and 0.05% of organic tin catalyst.

Comparative example No. two

The one-part polyurethane foam of this comparative example was a commercially available polyurethane foam purchased directly.

Product detection

Viscosity: under the indoor normal temperature environment condition, the viscosity of a product sample is checked by using a rotary viscometer, a test rotor of the viscometer is vertically immersed into the center of the sample in a container with the diameter of more than or equal to 6cm and the height of more than or equal to 11cm, and the liquid level reaches the level mark of the rotor; the viscometer is turned on for the test and readings are taken showing no change, three times for each sample and expressed as an arithmetic mean.

Surface drying time: the product sample is uniformly scraped on the surface of a clean scraped surface fineness meter, and the product sample with the thickness of 0.1-0.3mm is required to be placed for a certain time under the natural environment with relatively gentle air circulation, so that the vertical surface of the cut smooth corrugated paper freely falls from a height of about 3cm to the surface of the product sample, and the phenomenon of adhesion and wire drawing does not occur.

Coking point: and (3) baking a product sample with the thickness of 3mm in a specified container at a high temperature by using an air drying oven, wherein the product sample still presents light brown or brown after being baked at the high temperature for 20min, and the coking phenomenon is not allowed to occur.

Solid content: placing a product sample with the weight of 2.0 +/-0.5 g in a weighed culture dish to ensure that the sample is uniformly distributed at the bottom of the container; baking at 105 + -2 deg.C for 30min, taking out, cooling to room temperature in a drier, and weighing; then baking at the high temperature of 105 +/-2 ℃ for 10min, taking out, putting into a drier, cooling to room temperature, and weighing until the difference between the two weighing processes is less than or equal to 0.01 g; and obtaining the solid content value according to the ratio of the product sample before and after the test.

Foaming height: visual inspection was carried out.

Tensile resistance:

1. the tensile resistance requirement is as follows:

1) after the foaming adhesive is hot-pressed and baked at high temperature (coking point temperature), the tensile resistance is greater than a specified value.

2) When the tensile force is less than the prescribed value within 10kg, the judgment is carried out according to the breakage of the honeycomb paper

a. The honeycomb paper is qualified if the fibers of the honeycomb paper are broken and the honeycomb paper is tightly bonded with the glue.

b. The honeycomb paper and the glue fall off, and the honeycomb paper is not qualified if no honeycomb paper is broken on the glue.

2. Test method

Pre-treating a plate with the thickness of 0.5mm, manufacturing a sample plate with the effective area of 120mm x 170mm, uniformly brushing a layer of product sample on the surface of the sample plate by using a foaming adhesive scraper for production according to a normal production flow, fixing honeycomb paper in the sample plate, carrying out hot pressing on the sample plate, standing at normal temperature for more than 4 hours, then placing in a coking point temperature constant-temperature oven for high-temperature baking for 25min, and after baking, placing in a normal temperature for temperature balancing for more than 1 hour; and respectively using a universal testing machine to carry out tension test on the sample plates after hot pressing and baking.

The performance test of the one-component polyurethane foam rubber products of examples one to five and comparative examples one and two was carried out according to the above method, and the test results are shown in table 1.

TABLE 1 examination results of examples and comparative examples

As can be seen from Table 1, the tensile strength and viscosity of the one-component polyurethane foam rubber products prepared by the five examples of the invention are obviously higher than those of the first comparative example and the second comparative example, and the foaming height is also obviously higher than that of the first comparative example, so that the crosslinking effect is realized in the foam rubber through the compounding of the added amino resin and the rosin resin, and the bonding capability and the foaming height of the foam rubber are improved.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.