CN114907539A

CN114907539A - High-bonding-strength polyurethane foam for flame lamination and preparation method thereof

Info

Publication number: CN114907539A
Application number: CN202210416660.2A
Authority: CN
Inventors: 顾文东
Original assignee: Jiangyin Xinjia Technology And Trade Co Ltd
Current assignee: Jiangyin Xinjia Technology And Trade Co Ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-08-16

Abstract

The invention discloses high-bonding-strength polyurethane foam for flame bonding, which comprises, by mass, 50-90 parts of polyether polyol, 10-50 parts of polycarbonate polyol, 20-150 parts of polyisocyanate, 1-25 parts of a foaming agent, 0.5-3 parts of a stabilizer, 0-20 parts of a flame retardant and 0-3 parts of a catalyst, wherein the polycarbonate polyol is synthesized by carbon dioxide and an alkylene oxide hydrocarbon compound under the action of a DMC catalyst, and an initiator used in the synthesis process of the polycarbonate polyol is polyol or polyester polyol. The invention also discloses a preparation method of the high-bonding-strength polyurethane foam for flame bonding. The polyurethane foam prepared by the technical scheme of the invention has higher peel strength during flame bonding without using a flame bonding agent, can be tightly combined with a base material, and has higher reproducibility.

Description

High-bonding-strength polyurethane foam for flame lamination and preparation method thereof

Technical Field

The invention relates to the technical field of polyurethane foam, in particular to high-bonding-strength polyurethane foam for flame lamination and a preparation method thereof.

Background

Flexible polyurethane foams have been widely used in various fields such as furniture, automobiles, airplanes, and the like. When polyurethane foam is used for manufacturing some products, the polyurethane foam and a substrate (such as wood, fabric, metal or plastic materials) are generally required to be jointed to form a composite material, and two common jointing methods are that the foam is jointed with the substrate through an adhesive, and the other method is flame jointing, namely, the surface of the polyurethane foam is hot melted and converted into sticky substances through flame action, and then the substrate is laminated without adding extra additives. When the product is manufactured by using a flame bonding method, the viscous polyurethane foam becomes solid after cooling, so that the polyurethane foam and the base material are firmly combined.

The polyurethane foams widely used in the market for flame bonding mainly comprise two types, one type is polyether polyurethane prepared by taking polyether alcohol as a main raw material, the other type is polyester alcohol polyurethane prepared by taking polyester alcohol as a main raw material, and compared with polyester polyurethane, the polyether polyurethane foam has better aging capability, but when the flame bonding polyurethane foam is used for flame bonding, the adhesion between the foam and a substrate is poor, and a special flame bonding agent is usually required to be added to enhance the bonding force between the foam and the substrate.

In recent years, in order to prevent global warming and construct a circulating society, technological developments have been made worldwide, such as production of polyurethane materials from carbon dioxide as a raw material, with a view to reducing the amount of non-renewable resources such as petroleum and coal. For example, U.S. patent No. US8535476B2 discloses a polyurethane foam that is made from a natural oil derived polyol as a primary raw material and at a conventional density. Although the natural oil-based polyurethane foam has higher cohesive force during flame lamination, compared with the polyester polyurethane foam, the peel strength of the natural oil-based polyurethane foam is improved by 20 percent without adding a flame laminating agent, but the peel strength of the natural oil-based polyurethane foam cannot meet the peel strength required in the conventional occasion. Therefore, it has become a hot research in recent years to reduce the amount of polyether polyol derived from petroleum and to produce a polyurethane foam having high bonding strength using carbon dioxide as a raw material.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a polyurethane foam prepared from carbon dioxide as a raw material, so that the using amount of polyether polyol is reduced, and higher peel strength is obtained in flame bonding.

In order to achieve the purpose, the technical scheme of the invention is to provide a high-bonding-strength polyurethane foam for flame bonding, which is characterized by comprising 50-90 parts by mass of polyether polyol, 10-50 parts by mass of polycarbonate polyol, 20-150 parts by mass of polyisocyanate, 1-25 parts by mass of a foaming agent, 0.5-3 parts by mass of a stabilizer, 0-20 parts by mass of a flame retardant and 0-3 parts by mass of a catalyst, wherein the polycarbonate polyol is synthesized by carbon dioxide and an alkylene oxide hydrocarbon compound under the action of a DMC catalyst, and an initiator used in the synthesis process of the polycarbonate polyol is polyol or polyester polyol.

In order to reduce the use amount of polyether polyol and increase the bonding strength of polyether-based polyurethane foam, the invention provides a technical scheme that polycarbonate polyol is used for replacing part of polyether polyol to prepare polyurethane foam, wherein the polycarbonate polyol is synthesized by carbon dioxide and alkylene oxide compounds under the action of DMC catalyst, and the alkylene oxide compounds comprise any one or mixture of several of substituted ethylene oxide, propylene oxide, butylene oxide, cyclopentane oxide, hexane oxide, heptane oxide, octane oxide, nonane oxide, decane oxide, undecane oxide, dodecane oxide, cyclopentane oxide, cyclohexane oxide, cycloheptane oxide, cyclooctane oxide and styrene oxide. For the example of methyl ethylene oxide (PO), the polycarbonate polyols have the following reaction formula:

the initiator (Starter) is generally a compound containing active hydrogen atoms, such as polyol, polyfunctional amine, polythiol, polyfunctional amino alcohol, polyether polyol, polyester polyol, etc., in the technical scheme of the invention, the initiator in the synthesis of the polycarbonate polyol is polyol, specifically, the polyol comprises one or a mixture of more of dihydric alcohol, trihydric alcohol, pentaerythritol, sorbitol, hexitol, sucrose, starch, cellulose, and the dihydric alcohol can be used is ethylene glycol, diethylene glycol, propylene glycol, pentanediol, hexanediol, and the trihydric alcohol can be used is trimethylolpropane, glycerol, castor oil. The polyol is used as an initiator to prepare the polycarbonate polyol, and the polycarbonate polyol is used for synthesizing the polyurethane foam, so that the using amount of the polyether polyol is reduced, the intake and the emission of harmful substances are reduced, and the bonding strength of the polyurethane foam is improved.

In order to ensure the aging performance and the adhesive strength of polyurethane foam, certain amount of polyether polyol and polyisocyanate are required to be present in the formula, the foaming agent mainly functions to change the produced polyurethane into a foam material, and in order to improve the yield and the processability of products and other properties of the products, stabilizers, flame retardants, catalysts and the like are also required to be added in the formula. The preferred flame retardant is an organophosphorus flame retardant, the stabilizer is preferably an organosilicon foam stabilizer, and the catalyst can be selected from various catalysts, such as an organometallic compound alone, an amine catalyst, an ether catalyst or a mixture of several different catalysts.

The proportion of each component in the formula is also very important for preparing high-viscosity polyurethane foam, in the technical scheme of the invention, the polyether polyol is preferably 50-90 parts, specifically 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts and 90 parts by mass, the content of the polycarbonate polyol is preferably 10-50 parts, specifically 10 parts, 12 parts, 15 parts, 18 parts, 22 parts, 25 parts, 28 parts, 32 parts, 40 parts, 45 parts and 50 parts. The content of the polyisocyanate is properly adjusted according to the content of the polyether polyol and the polycarbonate polyol, and the adding part is 20-150 parts, preferably 20-70 parts. The foaming agent is an essential component for preparing the foam material, and the addition amount of the foaming agent is not less than 1 part in consideration of the performance of the prepared polyurethane foam.

The further preferable technical scheme is that the content of the polyisocyanate is 20-70 parts, and the index of isocyanate in the polyurethane foam is 90-130. In order to further improve the performance of the prepared polyurethane foam, in a further preferable technical scheme, the content of the used polyisocyanate is 20-70 parts, and the specific content depends on the content of the polyether polyol, the polycarbonate polyol, the foaming agent and other additives, so that the index of isocyanate in the mixture is 90-130. Examples of isocyanates that may be used include aliphatic isocyanates such as Hexamethylene Diisocyanate (HDI) or isophorone diisocyanate (IPDI), aromatic isocyanates such as Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI).

The further preferable technical scheme is that the functionality of the polyether polyol is 2-5, the hydroxyl value is 20-200 mgKOH/g, the functionality of the polycarbonate polyol is 2-5, and the hydroxyl value is 30-100 mgKOH/g. The functionality and hydroxyl value of the polyether polyol and polycarbonate polyol have great influence on the viscosity and processability of the prepared polyurethane foam, and in the preferred technical scheme, the functionality of the polyether polyol is 2-5, specifically 2, 3, 4 and 5, and the hydroxyl value is 20-200 mgKOH/g, preferably 30-100 mgKOH/g, specifically 30, 40, 45, 50, 53, 55, 60, 65, 70, 85 and 100 mgKOH/g. The functionality of the polycarbonate polyols may be in particular 2, 3, 4, 5 and the hydroxyl number may be 30, 35, 40, 42, 45, 47, 50, 60, 70, 85, 100 mgKOH/g.

The further preferable technical scheme is that the mass percentage of carbon dioxide in the polycarbonate polyol is 20-50%. The content of carbon dioxide in the polycarbonate polyol has an important influence on the properties of the polycarbonate polyol, such as molecular weight, viscosity and the like, and in order to prepare a polyurethane foam with good performance, the content of carbon dioxide in the polycarbonate polyol is preferably 20 to 50%, specifically 20%, 23%, 26%, 28%, 30%, 32%, 35%, 40%, 45%, 50%.

The further preferable technical scheme is that the polyurethane foam further comprises a plasticizer, and the plasticizer comprises one or more of dibutyl phthalate, dioctyl phthalate, epoxidized soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate, chlorinated paraffin, synthetic vegetable ester, citric acid esters, dimethyl carbonate, ethylene carbonate and propylene carbonate.

The further preferable technical scheme is that the plasticizer comprises propylene carbonate, and the using amount of the plasticizer is 2-20 parts.

In the production of polyurethane foams, it has been found that polycarbonate polyols have very high viscosities at relatively low temperatures, and that polycarbonate polyols having viscosities of more than 200000 mPas at 25 ℃ lead to difficulties in processing when producing polyurethane foams. In order to reduce the viscosity of the polycarbonate polyol, in addition to raising the preparation temperature, another preferable method is to add a plasticizer to the formula, and the plasticizer meeting the environmental protection requirement is synthetic vegetable ester, citric acid esters, dimethyl carbonate, ethylene carbonate, propylene carbonate and the like, so that in the technical scheme of the invention, one or a combination of several of the above types is preferable. In a further preferred embodiment, the plasticizer used comprises propylene carbonate, i.e. propylene carbonate alone can be used as the plasticizer, or a mixture of ethylene carbonate and propylene carbonate, a mixture of propylene carbonate and dimethyl carbonate, and a mixture of ethylene carbonate, propylene carbonate and dimethyl carbonate can be used.

The further preferable technical scheme is that the foaming agent comprises a main foaming agent and an auxiliary foaming agent, the main foaming agent is 1-5 parts by mass, the auxiliary foaming agent is 0-20 parts by mass, and the auxiliary foaming agent comprises one or more of pentane, n-butane, isobutane, propane, acetone, methyl ethyl ketone, ethyl acetate, dichloromethane and carbon dioxide. When preparing polyurethane foam, water is usually selected as a foaming agent, and an auxiliary foaming agent can also be added into the water, wherein the usable auxiliary foaming agent mainly comprises a halogenated hydrocarbon foaming agent, an alkane foaming agent, an ether foaming agent, a ketone foaming agent and the like, and considering the influence of fluorine-containing substances on the environment, the foaming agent selected by the invention preferably comprises one or more of dichloromethane, pentane, n-butane, isobutane, propane, acetone, methyl ethyl ketone, ethyl acetate and carbon dioxide.

The further preferable technical scheme is that the catalyst comprises one or two of polyamine catalyst and metal catalyst, the dosage of the polyamine catalyst is 0-2 parts, and the dosage of the metal catalyst is 0-2 parts. In order to accelerate the reaction between the compounds and improve the yield, when preparing polyurethane foam, the production process will add some catalysts, which commonly include polyamine catalyst, metal catalyst, organic alcohol or ether compound, in the preferred technical scheme of the invention, the catalyst used includes one or a mixture of two of polyamine catalyst and metal catalyst.

The present invention also provides a process for the preparation of a polyurethane foam according to claim 1, characterized in that it comprises the following steps:

(1) firstly, weighing polyether polyol, polycarbonate polyol, a foaming agent, a stabilizer, a flame retardant, a plasticizer and a catalyst, adding the weighed polyether polyol, polycarbonate polyol, foaming agent, stabilizer, flame retardant, plasticizer and catalyst into a container according to parts by weight, and stirring the materials by using a stirrer to uniformly mix the materials, wherein the stirring speed is 2500-4000 r/min, and the stirring time is 40-120 s;

(2) weighing polyisocyanate, adding the polyisocyanate into the mixture obtained in the step (1), and uniformly stirring and mixing the polyisocyanate at a stirring speed of 800-1500 r/min for 5-20 s;

(3) and pouring the mixture into a foaming mold for foaming to prepare polyurethane foam.

In the preparation of polyurethane foams, the preferred preparation method comprises three steps, i.e. polyol and various additives are uniformly mixed, polyisocyanate is added, and finally the mixture is placed into a foaming mold for foaming. The whole mixing process can be carried out at normal temperature or at the temperature of 30-80 ℃.

The invention has the advantages and beneficial effects that:

1. 10-50 parts of polycarbonate polyol is added into 50-90 parts of polyether polyol, and materials such as a foaming agent, a stabilizer, a flame retardant, a plasticizer and the like are added into the mixture to prepare polyurethane foam, and the prepared polyurethane foam has high peel strength during flame bonding under the condition of not using a flame bonding agent and can be tightly combined with a base material.

2. The polycarbonate polyol which is synthesized by using the polyol as an initiator and carbon dioxide and alkylene oxide compounds under the action of the DMC catalyst does not need to consume non-renewable resources, can consume the carbon dioxide, and meets the development requirement of carbon neutralization.

3. The plasticizer containing the propylene carbonate can reduce the viscosity of a reaction system on one hand, and the propylene carbonate can be generated by the reaction of propylene oxide and carbon dioxide on the other hand, so that the environment-friendly requirement is met.

4. The method comprises the steps of uniformly mixing the polyol and various additives, adding the polyisocyanate into the mixture, and finally placing the mixture into a foaming mold for foaming to prepare the polyurethane foam.

Detailed Description

The specific embodiments of the present invention will be further described with reference to examples, wherein the polyether polyols of the examples and comparative examples are both DEP-5631ED from Dow, Inc., having a functionality of 3 and a hydroxyl number of 56; the vegetable oil polyol is a product from Polygreen Chemical (Malyssia) Sdn Bhd with model number POLYGREEN F6037, and has a functional group of 2 and a hydroxyl value of 95; the flame laminating agent is a product with the model number of Niax FLE-200 from the new material group of the Michigan; the flame retardant is a product with the model number TCPP from New Material Co., Ltd of Redst, Tezhou, Jiangsu; the polyamine catalyst is DP-230 of Anhuidekang, Inc.; the metal catalyst is DP-T9 of Anhuidekang practical Co., Ltd; the organic silicon stabilizer is XH-2618 from Hangzhou Chongyao scientific and technological development GmbH. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

The high-bonding-strength polyurethane foam for flame lamination comprises, by mass, 50 parts of polyether polyol, 50 parts of polycarbonate polyol, 50 parts of toluene diisocyanate, 5 parts of water, 12 parts of dichloromethane, 0.5 part of a stabilizer, 2 parts of a metal catalyst and 2 parts of a plasticizer, wherein the polycarbonate polyol is synthesized by carbon dioxide and propylene oxide under the action of a DMC catalyst, an initiator used in the synthesis process is ethylene glycol, the functionality of the polycarbonate polyol is 2, the hydroxyl value is 52mgKOH/g, and the content of carbon dioxide in the polycarbonate polyol is 20%. The plasticizer used was propylene carbonate.

A preparation method of high-bonding-strength polyurethane foam for flame lamination comprises the following steps:

(1) firstly, weighing polyether polyol, polycarbonate polyol, a foaming agent, a stabilizer, a flame retardant, a plasticizer and a catalyst, adding the weighed polyether polyol, polycarbonate polyol, foaming agent, stabilizer, flame retardant, plasticizer and catalyst into a container according to parts by weight, and stirring the materials by using a stirrer to uniformly mix the materials, wherein the stirring speed is 2500r/min, and the stirring time is 120 s;

(2) weighing toluene diisocyanate, adding the toluene diisocyanate into the mixture in the step (1), and stirring and mixing uniformly at the stirring speed of 800r/min for 20 s;

Example 2

A high-bonding-strength polyurethane foam for flame lamination comprises, by mass, 60 parts of polyether polyol, 40 parts of polycarbonate polyol, 70 parts of diphenylmethane diisocyanate, 2.7 parts of water, 0.8 part of a stabilizer, 0.1 part of a polyamine catalyst, 0.5 part of a metal catalyst, 12 parts of a flame retardant and 20 parts of a plasticizer, wherein the polycarbonate polyol is synthesized by carbon dioxide and epoxy dodecane under the action of a DMC catalyst, an initiator used in the synthesis process is butanediol, the functionality of the polycarbonate polyol is 3, the hydroxyl value is 46mgKOH/g, and the content of carbon dioxide in the polycarbonate polyol is 27%. 20 parts by mass of carbon dioxide is dissolved in water serving as a foaming agent, and the used plasticizer is a mixture of propylene carbonate, ethylene carbonate and dimethyl carbonate, wherein 10 parts of propylene carbonate, 6 parts of ethylene carbonate and 4 parts of dimethyl carbonate are used.

(1) firstly, weighing polyether polyol, polycarbonate polyol, a foaming agent, a stabilizer, a flame retardant, a plasticizer and a catalyst, adding the weighed polyether polyol, polycarbonate polyol, foaming agent, stabilizer, flame retardant, plasticizer and catalyst into a container according to parts by weight, and stirring the materials by using a stirrer to uniformly mix the materials, wherein the stirring speed is 3000r/min, and the stirring time is 60 s;

(2) weighing diphenylmethane diisocyanate, adding the diphenylmethane diisocyanate into the mixture obtained in the step (1), and uniformly stirring and mixing at the stirring speed of 1000r/min for 10 s;

Example 3

The high-bonding-strength polyurethane foam for flame lamination comprises, by mass, 70 parts of polyether polyol, 30 parts of polycarbonate polyol, 105 parts of diphenylmethane diisocyanate, 4.2 parts of water, 6 parts of isobutane, 1.0 part of a stabilizer, 0.3 part of a polyamine catalyst, 0.2 part of a metal catalyst, 5 parts of a flame retardant and 15 parts of a plasticizer, wherein the polycarbonate polyol is synthesized by carbon dioxide and methyl ethylene oxide under the action of a DMC catalyst, an initiator used in the synthesis process is castor oil, the functionality of the polycarbonate polyol is 3, the hydroxyl value is 100mgKOH/g, and the content of carbon dioxide in the polycarbonate polyol is 32%. The plasticizer used is a mixture of propylene carbonate and ethylene carbonate, wherein 8 parts of propylene carbonate and 7 parts of ethylene carbonate are used.

Example 4

The high-bonding-strength polyurethane foam for flame lamination comprises, by mass, 80 parts of polyether polyol, 20 parts of polycarbonate polyol, 55 parts of toluene diisocyanate, 3.8 parts of water, 2 parts of dichloromethane, 1.2 parts of a stabilizer, 2 parts of a polyamine catalyst, 5 parts of a flame retardant and 10 parts of a plasticizer, wherein the polycarbonate polyol is synthesized by carbon dioxide and propylene oxide under the action of a DMC catalyst, an initiator used in the synthesis process is ethylene glycol, the functionality of the polycarbonate polyol is 4, the hydroxyl value is 30mgKOH/g, and the content of carbon dioxide in the polycarbonate polyol is 50%. The plasticizer used was a mixture of propylene carbonate and dimethyl carbonate, of which 5 parts propylene carbonate and 5 parts dimethyl carbonate.

(1) firstly, weighing polyether polyol, polycarbonate polyol, a foaming agent, a stabilizer, a flame retardant, a plasticizer and a catalyst, adding the weighed materials into a container according to parts by weight, and stirring the materials by using a stirrer to uniformly mix the materials, wherein the stirring speed is 3000r/min and the stirring time is 60 s;

Example 5

The high-bonding-strength polyurethane foam for flame lamination comprises, by mass, 90 parts of polyether polyol, 10 parts of polycarbonate polyol, 25 parts of toluene diisocyanate, 1 part of water, 3 parts of a stabilizer, 1.2 parts of a polyamine catalyst, 0.25 part of a metal catalyst, 20 parts of a flame retardant and 5 parts of propylene carbonate, wherein the polycarbonate polyol is synthesized by carbon dioxide and methyl ethylene oxide under the action of a DMC catalyst, sorbitol is used as an initiator in the synthesis process, the functionality of the polycarbonate polyol is 5, the hydroxyl value is 66mgKOH/g, and the content of carbon dioxide in the polycarbonate polyol is 46%.

(1) firstly, weighing polyether polyol, polycarbonate polyol, a foaming agent, a stabilizer, a flame retardant, a plasticizer and a catalyst, adding the weighed polyether polyol, polycarbonate polyol, foaming agent, stabilizer, flame retardant, plasticizer and catalyst into a container according to parts by weight, and stirring the materials by using a stirrer to uniformly mix the materials, wherein the stirring speed is 4000r/min and the stirring time is 40 s;

(2) weighing polyisocyanate, adding the polyisocyanate into the mixture obtained in the step (1), and uniformly stirring and mixing at the stirring speed of 1500r/min for 5 s;

Comparative example 1

The polyurethane foam for flame lamination comprises, by mass, 100 parts of polyether polyol, 25 parts of toluene diisocyanate, 3.8 parts of water, 1 part of a stabilizer, 0.25 part of a polyamine catalyst, 0.2 part of a metal catalyst, 5 parts of a flame retardant and 3 parts of a flame laminating agent.

A preparation method of polyurethane foam for flame lamination comprises the following steps:

(1) firstly weighing polyether polyol, a flame laminating agent, a foaming agent, a stabilizer, a flame retardant and a catalyst, adding the weighed polyether polyol, the flame laminating agent, the foaming agent, the stabilizer, the flame retardant and the catalyst into a container according to parts by weight, and stirring the mixture by using a stirrer to uniformly mix the mixture, wherein the stirring speed is 3000r/min, and the stirring time is 60 s;

(2) weighing toluene diisocyanate, adding the toluene diisocyanate into the mixture in the step (1), and stirring and mixing uniformly at the stirring speed of 1000r/min for 10 s;

Comparative example 2

The polyurethane foam for flame lamination comprises, by mass, 80 parts of polyether polyol, 20 parts of vegetable oil polyol, 25 parts of toluene diisocyanate, 10 parts of propylene carbonate, 3.8 parts of water, 2 parts of dichloromethane, 1 part of an organic silicon stabilizer, 0.23 part of a polyamine catalyst, 0.2 part of a metal catalyst and 5 parts of a flame retardant.

(1) firstly weighing polyether polyol, vegetable oil polyol, water, dichloromethane, a plasticizer, a stabilizer, a flame retardant and a catalyst, adding the weighed polyether polyol, vegetable oil polyol, water, dichloromethane, plasticizer, stabilizer, flame retardant and catalyst into a container according to parts by weight, and stirring the mixture by using a stirrer to uniformly mix the mixture, wherein the stirring speed is 3000r/min, and the stirring time is 60 s;

(2) weighing toluene diisocyanate, adding the toluene diisocyanate into the mixture obtained in the step (1), and uniformly stirring and mixing the toluene diisocyanate at the stirring speed of 1000r/min for 10 s;

When the polyurethane foams of examples 1 to 5 and comparative examples 1 and 2 were used, it was noted that the occurrence of foam jumping and gas blowing was observed and recorded when the foam was lifted to the highest position, and the occurrence of foam shrinkage was recorded after the foam was completely foamed and left to stand at room temperature for 24 hours.

The polyurethane foams of examples 1 to 5 and comparative examples 1 to 2 were cut into 4cm by 15cm by 1cm foam strips, flame-fused to polyester-cotton fabric to prepare foam flame laminates, and the peel strength was measured at a peel speed of 100mm/min according to ISO 8067-; taking the polyurethane foams of the examples 1-5 and the comparative examples 1-2, and testing the hardness of the polyurethane foams according to a hardness testing method in the national standard GB/T10807-2006, wherein the indentation depth is 25 percent, and the hardness corresponds to 25 percent; the testing of the degree of renewability was done in miami laboratories, florida, usa, using an accelerator mass spectrometer and calculating the radioactive carbon (C14) fraction, i.e. the percentage of biobased carbon, and the results are shown in the table below.

Examples	Degree of renewability (%)	Hardness (H) of 25%	Top gas of foam	Shrinkage of foam	Peel strength (N)
						Example 1	15.3	151	Is normal	Is free of	10.7
Example 2	18.1	148	Is normal	Is free of	11.2
						Example 3	17.4	142	Is normal	Is free of	9.5
Example 4	14.6	134	Is normal	Is free of	8.8
						Example 5	9.2	128	Is normal	Is free of	7.2
Comparative example 1	0	122	Is normal	Is free of	8.3
						Comparative example 2	15	132	A little bit less	Is free of	5.5

The results in the table show that the polyurethane foam prepared by the technical scheme of the invention has higher bonding strength and higher regenerability when being used for flame bonding, meets the development requirement of carbon neutralization, can be normally foamed, and can not shrink after being cured.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The high-bonding-strength polyurethane foam for flame lamination is characterized by comprising, by mass, 50-90 parts of polyether polyol, 10-50 parts of polycarbonate polyol, 20-150 parts of polyisocyanate, 1-25 parts of a foaming agent, 0.5-3 parts of a stabilizer, 0-20 parts of a flame retardant and 0-3 parts of a catalyst, wherein the polycarbonate polyol is synthesized by carbon dioxide and an alkylene oxide hydrocarbon compound under the action of a DMC catalyst, and an initiator used in the synthesis process of the polycarbonate polyol is polyol or polyester polyol.

2. The polyurethane foam according to claim 1, wherein the polyisocyanate is contained in an amount of 20 to 70 parts, and the isocyanate index in the polyurethane foam is 90 to 130.

3. The polyurethane foam according to claim 1, wherein the polycarbonate polyol has a functionality of 2 to 5 and a hydroxyl value of 30 to 100 mgKOH/g.

4. The polyurethane foam according to claim 1, wherein the polycarbonate polyol contains 20 to 50% by mass of carbon dioxide.

5. The polyurethane foam of claim 1, wherein the components of the polyurethane foam further comprise a plasticizer, and the plasticizer comprises one or more of dibutyl phthalate, dioctyl phthalate, epoxidized soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate, chlorinated paraffin, synthetic vegetable esters, citric acid esters, dimethyl carbonate, ethylene carbonate, and propylene carbonate.

6. The polyurethane foam of claim 5, wherein the plasticizer comprises propylene carbonate and is present in an amount of 2 to 20 parts.

7. The polyurethane foam according to claim 1, wherein the foaming agent comprises a main foaming agent and an auxiliary foaming agent, the main foaming agent is used in an amount of 1-5 parts by mass, the auxiliary foaming agent is used in an amount of 0-20 parts by mass, and the auxiliary foaming agent comprises one or more of pentane, n-butane, isobutane, propane, acetone, methyl ethyl ketone, ethyl acetate, dichloromethane and carbon dioxide.

8. The polyurethane foam according to claim 1, wherein the catalyst comprises one or both of a polyamine catalyst and a metal catalyst, the polyamine catalyst is used in an amount of 0 to 2 parts, and the metal catalyst is used in an amount of 0 to 2 parts.

9. A method of preparing the polyurethane foam of claim 1, comprising the steps of: