Long-chain alkyl acrylate polymer dispersion liquid

Abstract

The invention discloses a long-chain alkyl acrylate polymer dispersion liquid which is composed of a long-chain alkyl acrylate polymer, alcoholic hydroxyl-terminated long-chain alkyl silicone oil, a surfactant, a cosolvent and water. The long-chain alkyl acrylate polymer at least comprises a long-chain alkyl acrylate monomer unit and a monomer unit containing an active hydroxyl group; and the alcoholic hydroxyl-terminated long-chain alkyl silicone oil accounts for 15-40% of the total mass of the long-chain alkyl acrylate polymer and the alcoholic hydroxyl-terminated long-chain alkyl silicone oil. The fluorine-free fabric finishing agent dispersion liquid is good in stability and excellent in continuous processing performance when waterproof processing is carried out on fabrics, and the fabrics treated by the fluorine-free fabric finishing agent dispersion liquid are excellent in waterproof performance and good in washability.

Description

Technical Field

[0001] This invention relates to fabric waterproofing treatment technology, belonging to the field of fabric waterproofing finishing agent production technology, and in particular to a long-chain alkyl acrylate polymer dispersion. Background Technology

[0002] Fluoroalkyl polymers are widely used in the textile industry for their excellent water, oil, and stain repellency, significantly improving the durability and functionality of fabrics. However, due to the potential environmental pollution and health risks posed by perfluorooctanoic acid (PFOA) and related compounds, such as bioaccumulation and carcinogenicity, these finishing agents have been phased out globally.

[0003] Given increasingly stringent environmental regulations and public concern for health and safety, the development of fluorine-free waterproofing agents has become an inevitable trend. However, current fluorine-free waterproofing agents on the market generally suffer from significant drawbacks, including insufficient performance such as poor waterproofing effect, low wash resistance, and poor processing continuity, such as easy failure or unstable effect during textile production. Therefore, there is an urgent need to develop a new type of highly efficient and stable fluorine-free waterproofing agent to comprehensively solve the problems of insufficient performance and poor processing continuity, thereby meeting the needs of industrial applications and promoting sustainable development. Therefore, there is a pressing need for a stable long-chain alkyl acrylate polymer dispersion that exhibits excellent continuous processing performance and is pollution-free when waterproofing fabrics. Summary of the Invention

[0004] The purpose of this invention is to provide a long-chain alkyl acrylate polymer dispersion. This dispersion has good emulsion stability and excellent continuous processing performance when used to waterproof fabrics. Fabrics treated with this dispersion have excellent waterproof performance and good washability. After flexing, almost no chalk marks are left on the surface of the treated fabric.

[0005] In order to achieve the objective of this invention, the following technical solution is adopted:

[0006] A long-chain alkyl acrylate polymer dispersion is composed of a long-chain alkyl acrylate polymer, a terminal alcohol hydroxyl long-chain alkyl silicone oil, a surfactant, a co-solvent, and water.

[0007] The long-chain alkyl acrylate polymer comprises at least long-chain alkyl acrylate monomer units and monomer units containing active hydroxyl groups; the terminal alcohol hydroxyl long-chain alkyl silicone oil accounts for 15% to 40% of the total mass of the long-chain alkyl acrylate polymer and the terminal alcohol hydroxyl long-chain alkyl silicone oil.

[0008] Furthermore, the long-chain alkyl acrylate monomer is one or a mixture of at least two of (meth)acrylate dodecyl acrylate, (meth)acrylate tetradecyl acrylate, (meth)acrylate hexadecyl acrylate, (meth)acrylate octadecyl acrylate and (meth)acrylate dodecyl acrylate.

[0009] Furthermore, the long-chain alkyl acrylate monomer is one of octadecyl acrylate and octadecyl methacrylate.

[0010] Furthermore, the monomer containing an active hydroxyl group is a monomer that simultaneously contains polymerizable double bond groups and hydroxyl groups.

[0011] Furthermore, the monomer containing the active hydroxyl group can be represented by the formula CH2=CR′CO-Q′-OH, where R′ is H or an alkyl group and Q′ is a divalent organic group.

[0012] Furthermore, the monomer containing the active hydroxyl group is one or a mixture of at least two of N-hydroxymethylacrylamide, CH2=CHCOOCH2CH2OH and CH2=C(CH3)C OOCH2CH2OH.

[0013] Furthermore, the terminal alcohol hydroxyl long-chain alkyl silicone oil can be represented by the formula Q-[Si(CH3)2O]n-1-[Si(CH3)(Rh)O]m-Si(CH3)2-QOH, where m and n are integers greater than or equal to 1, QOH is a monovalent organic group containing at least one hydroxyl group, Q is an organic group represented by CH3 or QOH, and Rh is a long-chain alkyl group.

[0014] Furthermore, the terminal alcohol hydroxyl long-chain alkyl silicone oil is selected from one or a mixture of at least two of CH3-[Si(CH3)2O]n-[Si(CH3)(Rh)O]m-Si(CH3)2-R(R1-OH)2 or HO-R′-[Si(CH3)2O]n-[Si(CH3)(Rh)]m-Si(CH3)2-R′-OH, wherein R is a trivalent organic group, R1 is a divalent organic group, R′ is a divalent organic group, m and n are integers greater than or equal to 1, and Rh is a long-chain alkyl group.

[0015] Furthermore, the terminal alcohol hydroxyl long-chain alkyl silicone oil is selected from one or a mixture of at least two of CH3-[Si(CH3)2O]n-[Si(CH3)(C16H33)O]m-Si(CH3)2-R(R1-OH)2 or HO-R′-[Si(CH3)2O]n-[Si(CH3)(C8H17)]m-Si(CH3)2-R′-OH, wherein R is a trivalent organic group, R1 is a divalent organic group, R′ is a divalent organic group, and m and n are integers greater than or equal to 1.

[0016] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0017] The long-chain alkyl acrylate polymer dispersion of the present invention has good centrifugal stability and excellent continuous processing performance when waterproofing fabrics. Fabrics treated with it have excellent waterproof performance and good washability. After flexing, the treated fabric surface leaves almost no chalk marks. Detailed Implementation

[0018] To facilitate understanding of the present invention and to make the above-mentioned objects, features, and advantages of the present invention more apparent, a detailed description of specific embodiments of the present invention is provided below. Numerous specific details are set forth in the following description to provide a thorough understanding of the present invention, and preferred embodiments are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. The present invention can be implemented in many other ways different from those described herein, and similar modifications can be made by those skilled in the art without departing from the spirit of the invention; therefore, the present invention is not limited to the specific embodiments disclosed below. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] The present invention relates to a long-chain alkyl acrylate polymer dispersion.

[0020] The long-chain alkyl acrylate monomers described in this invention can be represented by the formula CH2=C(R)COO-R H This indicates that R" is H or CH3, R H It is a long-chain alkyl group with 8 or more carbon atoms. R H Preferably, the monomer is a long-chain alkyl group with 8 to 22 carbon atoms, such as dodecyl (meth)acrylate, tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, octadecyl (meth)acrylate, and dodecyl (meth)acrylate, etc. The long-chain alkyl acrylate monomer can be one or a mixture of at least two of the above monomers. More preferably, the long-chain alkyl acrylate monomer is one of octadecyl acrylate and octadecyl methacrylate.

[0021] The hydroxyl-containing monomer described in this invention is one or a mixture of at least one of N-hydroxymethylacrylamide or monomers represented by the formula CH2=CR′COO-Q′-OH, wherein R′ is H or an alkyl group, and Q′ is a divalent organic group. More preferably, the hydroxyl-containing monomer is one of N-hydroxymethylacrylamide or CH2=CHCOOCH2 CH2OH.

[0022] This invention discloses a long-chain alkyl acrylate polymer dispersion, wherein the surfactant is a nonionic surfactant or a mixture of a nonionic surfactant and a cationic surfactant. Nonionic surfactants typically contain a hydrophilic segment of a non-fluorinated polyether and / or a polyhydroxy group and a hydrophobic segment of a non-fluorinated hydrocarbon group. The hydrophilic and hydrophobic segments are connected by ester bonds, ether bonds, nitrogen atoms, etc., and the polyether group and the polyhydroxy group are connected by ether bonds. Examples of nonionic surfactants include: Span series (S-80, S-40, etc.), Tween series (T-60, T-20, etc.), fatty alcohol polyoxyethylene ether / polyoxypropylene ether (AEO-5, AEO-9, AEO-15, isomeric alcohol ether E-1306, etc.), fatty acid polyoxyethylene / polyoxypropylene ester (LAE-9, polyoxyethylene oleate A-105, SG-100, etc.), and fatty amine polyoxyethylene ether (AC-1810, AC-1820, etc.). Cationic surfactants typically contain a hydrophilic segment of a quaternary ammonium salt cationic group and a hydrophobic segment of a nonfluorinated hydrocarbon group, such as hexadecyltrimethylammonium chloride and octadecyltrimethylammonium chloride. The amount of surfactant used is typically 3% to 15% of the dispersion's mass, ensuring a stable dispersion is formed. The surfactant is preferably a mixture of nonionic and cationic surfactants, particularly a mixture of S-80, AEO-9, E-1306, and octadecyltrimethylammonium chloride. More preferably, the amount of surfactant used is 8.2% of the dispersion's mass. The surfactant composition is preferably 1.7 parts by mass of S-80, 1.0 parts by mass of AEO-9, 0.5 parts by mass of E-1306, and 5 parts by mass of octadecyltrimethylammonium chloride.

[0023] The long-chain alkyl acrylate polymer dispersion of the present invention can be prepared directly by emulsion polymerization; or it can be obtained by solution copolymerization to obtain an acrylate polymer solution, then dissolving terminal hydroxyl organosilicon and emulsifier into the solution, and then adding water to emulsify and remove the solvent. Preferably, it is obtained directly by emulsion polymerization.

[0024] Emulsion polymerization involves emulsifying the monomer in water in the presence of an emulsifier, followed by stirring and polymerization at a reaction temperature of 50–95°C for 3–15 hours. Polymerization can use either oil-soluble or water-soluble initiators. Oil-soluble initiators include azo dyes such as azobisisobutyronitrile (AIBN), and peroxide dyes such as benzoyl peroxide and di-tert-butyl peroxide. Water-soluble initiators include potassium persulfate, ammonium persulfate, sodium persulfate, azobisisobutyronitrile hydrochloride, hydrogen peroxide, and 3-carboxypropylene peroxide. The amount of initiator used is 0.05–5 wt% relative to 100 parts by weight of monomer. When using an oil-soluble initiator, it is preferable to add the initiator to the monomer before emulsification; however, when using a water-soluble initiator, it is preferable to add the initiator after the monomer emulsification. The preferred initiator is azobisisobutyronitrile hydrochloride, and the preferred amount is 0.6 wt% of the dispersion weight.

[0025] To obtain a uniformly dispersed dispersion with good storage stability, it is preferable to pre-emulsify the monomers at a certain temperature (e.g., 35–80°C, preferably 40–50°C), followed by at least one of the following treatments: high-pressure homogenization, ultrasonic disruption, or high-pressure film coating. The aforementioned treatment equipment can generate strong disruption energy, further refining the monomer droplets and enhancing their stability. High-pressure homogenization is preferred.

[0026] Furthermore, a solubilizer is preferably added to the long-chain alkyl acrylate polymer dispersion of the present invention. The solubilizer is a water-soluble ketone, alcohol, or ether solvent, such as acetone, isopropanol, glycerol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 3-methoxy-3-methyl-1-butanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, propylene glycol dimethyl ether, dipropylene glycol dimethyl ether, etc. Preferably, it is one of dipropylene glycol dimethyl ether. Its amount is preferably 5-45% of the monomer mass. More preferably, the solubilizer is dipropylene glycol, and its mass amount is more preferably 25% of the dispersion mass.

[0027] Chain transfer agents can also be added to the polymerization system to adjust the molecular weight of the polymer. Chain transfer agents can be selected from alkyl mercaptan compounds such as butyl mercaptan, octyl mercaptan, 2-mercaptoethanol, and dodecyl mercaptan, or inorganic salts such as sodium hypophosphite and sodium bisulfite, with dodecyl mercaptan being preferred. The preferred dosage is 0.1% to 3% of the monomer mass.

[0028] Depending on the requirements, pH adjusters such as acetic acid, sodium acetate, ammonium acetate, hydrochloric acid, phosphoric acid, potassium dihydrogen phosphate, and disodium hydrogen phosphate can be added to the system before or after polymerization.

[0029] The fabric waterproofing composition dispersion of the present invention can be used alone or in combination with other waterproofing solutions. These other waterproofing solutions can be fluorine-free or fluorine-containing, but it should be ensured that the solutions compounded with the dispersion of the present invention maintain consistent ionicity; otherwise, precipitation may occur in the compounded solution.

[0030] The fabric waterproofing composition dispersion of the present invention can be applied to the fabric to be treated using common methods. Typically, the dispersion is diluted with water, and then the treatment solution is adhered to the fabric by methods such as dip coating or spray coating. The fabric is then pressed and dried at high temperature to obtain the treated fabric. Alternatively, an aqueous isocyanate crosslinking agent emulsion can be added to the treatment solution, which will generate crosslinks after pressing and high-temperature treatment, further improving wash resistance. Other auxiliaries such as softeners and preservatives can also be added as needed. The composition is typically diluted to a mass concentration of 0.03–3%.

[0031] Fabrics that can be treated with the dispersion of the fabric waterproofing treatment composition of the present invention include: natural fiber fabrics (cotton, linen, animal fur, etc.), synthetic fiber fabrics (polyester fiber, polyamide fiber, polyester fiber, polyvinyl alcohol, polyacrylonitrile, polyvinyl chloride, polypropylene, etc.), semi-synthetic fiber fabrics (rayon, cellulose acetate, etc.), inorganic fiber fabrics (glass fiber, carbon fiber, asbestos fiber, etc.), and mixed fiber fabrics.

[0032] All raw materials used in this invention are commercially available, as detailed below:

[0033] SA: Octadecyl acrylate (purchased from Guangzhou Shanghe Chemical Technology Co., Ltd.)

[0034] SMA: Octadecyl methacrylate (purchased from Guangzhou Shanghe Chemical Technology Co., Ltd.)

[0035] OH monomer a: CH2=CHCOOCH2CH2OH (purchased from Shandong Chuangying Chemical Co., Ltd.)

[0036] OH monomer b: CH2=C(CH3)COOCH2CH2OH (purchased from Shandong Chuangying Chemical Co., Ltd.) OH monomer c: N-hydroxymethylacrylamide (purchased from Shanghai Gaoming Chemical Co., Ltd.)

[0037] IOTA 8866, a diol-hydroxyl-terminated long-chain alkyl silicone oil: CH3-[Si(CH3)2O] n-1 -[Si(CH3)(C 16 H 33 )O] m -Si(CH3)2-R(R1-OH)2 (where R is a trivalent organic group, R1 is a divalent organic group, m and n are integers greater than or equal to 1, purchased from Anhui Aiyota Silicone Oil Co., Ltd.)

[0038] IOTA-8865H: a long-chain alkyl silicone oil with dual-terminated alcohol hydroxyl groups: HO-R′-[Si(CH3)2O] n-1 -[Si(CH3)(C8H 17 )O] m-Si(CH3)2-R′-OH (where R′ is a divalent organic group, m and n are integers greater than or equal to 1, purchased from Anhui Aiyota Silicone Oil Co., Ltd.) Bi-hydroxyl-terminated silicone oil IOTA-2110: HO-R1′-[Si(CH3)2O] n -Si(CH3)2-R1′-OH (where R1′ is a divalent organic group, and n is an integer greater than or equal to 10, purchased from Anhui Aiyota Silicone Oil Co., Ltd.)

[0039] Example 1

[0040] 72 parts by weight of SA, 8 parts by weight of OH monomer a, and 20 parts by weight of IOTA-8866 were added to a reactor. Then, 20 parts by weight of dipropylene glycol monomethyl ether, 1.5 parts by weight of S-80, 0.5 parts by weight of MOA-3, 1.5 parts by weight of AEO-7, 1.5 parts by weight of E-1308, 5 parts by weight of hexadecyltrimethylammonium chloride, and 205 parts by weight of water were added. The mixture was stirred and heated to 42–47°C for pre-emulsification. Then, the mixture was homogenized under high pressure at 35 MPa for 20 minutes. The homogenized solution was transferred to the reactor and stirred. 0.5 parts by weight of initiator AIBA was dissolved in 2 parts by weight of water to form a homogeneous solution, which was added to the reactor. The mixture was then heated to 58°C and reacted for 2.5 hours, followed by heating to 75°C and reacting for 5 hours to obtain a long-chain alkyl acrylate polymer dispersion of the present invention.

[0041] Examples 2-10 and Comparative Examples 1-3

[0042] The production process is the same as in Example 1, and the specific formula is detailed in Table 1.

[0043] Table 1. Formulation Table (All figures in the table are parts by weight)

[0044]

[0045]

[0046]

[0047] Note: The dispersions obtained in Examples 1-10 and Comparative Examples 2-3 exhibited excellent centrifugal stability, meaning that no stratification or precipitation occurred after 30 minutes of centrifugation at 3000 rpm / min. The dispersion obtained in Comparative Example 1 stratified immediately after stirring was stopped following the reaction. The dispersions obtained in Comparative Examples 2 and 3 showed oil floating or stratification after 30 minutes of centrifugation at 3000 rpm / min. Therefore, Comparative Examples 1-3 could not obtain stable dispersions and will not be subject to further performance testing.

[0048] Test sample preparation

[0049] The dispersion was diluted to a concentration of 0.5%, and 25 wt% of the effective ingredient of water-based isocyanate curing agent JX-615H (purchased from Dongguan Jiangxing Industrial Co., Ltd.) was added. The test fabric was then treated, pressed, and then heat-treated at 150°C for 1 minute to obtain the test sample.

[0050] Performance testing methods

[0051] (1) Emulsion stability

[0052] The dispersion was centrifuged at 3000 rpm for 30 minutes, and the precipitation of the emulsion was then observed. No precipitation indicated excellent stability.

[0053] (2) Waterproofing test

[0054] The water resistance evaluation standard shall be performed in accordance with GB / T 4745-1997 Determination of the water resistance of textile fabric surface by water splash test, as detailed in Table 2.

[0055] Table 2 Water Resistance Evaluation Standard: GB / T 4745-1997 Determination of Water Resistance of Textile Fabrics Surface (Water Retention Test)

[0056] Waterproof rating state 5 The surface is dry 4 Slightly moistened surface 3 Partially moist surface 2 Surface wet 1 The surface is completely wet

[0057] (3) Continuous processing performance test

[0058] Prepare 1 kg of a 0.5% dispersion. Cut the fabric to be treated into 20 cm × 20 cm pieces. Treat the first piece of fabric according to the sample preparation method, and then treat the second to tenth pieces of fabric sequentially using the same method. Test the waterproof performance of each piece of fabric, and evaluate the continuous processability of the dispersion by the waterproof performance. If the waterproof rating of the first to n-1 pieces of fabric is all 4... + The waterproof rating of the nth piece of fabric is 4. + If the waterproof rating of the (n+1)th fabric piece is 4, then the continuous processability of the dispersion reaches n fabric pieces. See Table 3 for detailed test results.

[0059] (4) Washability test

[0060] Wash the garment according to the washing test method in GB 12799-91 Safety and Hygiene Performance Requirements for Oil- and Water-Resistant Protective Clothing, and then conduct a water resistance test. See Table 3 for the test results.

[0061] (5) Chalk mark test

[0062] Place the test cloths on a flat surface and lightly scratch the surface of the cloth with your fingernail. Visually determine whether any chalk-like marks remain due to the scratching. The results are shown in Table 3. ◎: No mark at all, ○: Faint mark visible, △: Mark visible, ×: Deeper mark visible. See Table 3 for detailed test results.

[0063] Table 3 Performance Tests

[0064]

[0065] Note: Comparative Example 5 was prepared according to the method of Example 3 in CN116770594 A.

[0066] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to achieve substantially the same technical effect are all covered within the protection scope of the present invention.

[0067] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A long-chain alkyl acrylate polymer dispersion, comprising a long-chain alkyl acrylate polymer, terminal alcohol hydroxyl long-chain alkyl silicone oil, a surfactant, a co-solvent, and water, characterized in that: The long-chain alkyl acrylate polymer comprises at least long-chain alkyl acrylate monomer units and monomer units containing active hydroxyl groups; the terminal alcohol hydroxyl long-chain alkyl silicone oil accounts for 15% to 40% of the total mass of the long-chain alkyl acrylate polymer and the terminal alcohol hydroxyl long-chain alkyl silicone oil.

2. The long-chain alkyl acrylate polymer dispersion according to claim 1, characterized in that, The long-chain alkyl acrylate monomer unit is one or a mixture of at least two of the following: dodecyl methacrylate, tetradecyl methacrylate, hexadecyl methacrylate, octadecyl methacrylate, and dodecyl methacrylate.

3. The long-chain alkyl acrylate polymer dispersion according to claim 1, characterized in that, The long-chain alkyl acrylate monomer unit is octadecyl acrylate.

4. The long-chain alkyl acrylate polymer dispersion according to claim 1, characterized in that, The monomer unit containing an active hydroxyl group is a monomer that simultaneously contains polymerizable double bond groups and hydroxyl groups.

5. The long-chain alkyl acrylate polymer dispersion according to claim 4, characterized in that, The monomer containing the active hydroxyl group can be represented by the formula CH2=CR′CO-Q′-OH, where R′ is H or alkyl and Q′ is a divalent organic group.

6. The long-chain alkyl acrylate polymer dispersion according to claim 5, characterized in that, The monomer containing the active hydroxyl group is one or a mixture of at least two of N-hydroxymethylacrylamide, CH2=CHCOOCH2CH2OH and CH2=C(CH3)COOCH2CH2OH.

7. The long-chain alkyl acrylate polymer dispersion according to claim 1, characterized in that, The terminal alcohol hydroxyl long-chain alkyl silicone oil can be represented by the formula Q-[Si(CH3)2O]n-1-[Si(CH3)(Rh)O]m-Si(CH3)2-QOH, where m and n are integers greater than or equal to 1, QOH is a monovalent organic group containing at least one hydroxyl group, Q is an organic group represented by CH3 or QOH, and Rh is a long-chain alkyl group.

8. The long-chain alkyl acrylate polymer dispersion according to claim 7, characterized in that, The terminal alcohol hydroxyl long-chain alkyl silicone oil is selected from one or a mixture of at least two of CH3-[Si(CH3)2O]n-[Si(CH3)(Rh)O]m-Si(CH3)2-R(R1-OH)2 or HO-R′-[Si(CH3)2O]n-[Si(CH3)(Rh)]m-Si(CH3)2-R′-OH, wherein R is a trivalent organic group, R1 is a divalent organic group, R′ is a divalent organic group, m and n are integers greater than or equal to 1, and Rh is a long-chain alkyl group.

9. The long-chain alkyl acrylate polymer dispersion according to claim 7, characterized in that, The terminal alcohol hydroxyl long-chain alkyl silicone oil is selected from one or a mixture of at least two of CH3-[Si(CH3)2O]n-[Si(CH3)(C16H33)O]m-Si(CH3)2-R(R1-OH)2 or HO-R′-[Si(CH3)2O]n-[Si(CH3)(C8H17)]m-Si(CH3)2-R′-OH, wherein R is a trivalent organic group, R1 is a divalent organic group, R′ is a divalent organic group, and m and n are integers greater than or equal to 1.

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