Boron-free glass fiber composition, glass fiber prepared from the same, and composite material comprising the glass fiber

1. A composition of matter, comprising the following components expressed as percentage by weight:

SiO 2

58-60.4%;

Al 2 O 3

14-16.5%;

CaO

14.1-16.5%;  

MgO

 6-8.2%;

Li 2 O

0.01-0.4%; 

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO 2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.4, and a range of the weight percentage ratio K 2 O/Na 2 O is greater than 1 and less than or equal to 6.

2. The composition of claim 1 , wherein a content of Li 2 O expressed as weight percentage is greater than or equal to 0.01% and less than 0.1%.

3. The composition of claim 1 , further comprising at least one of ZrO 2 or HfO 2 , and a total content of ZrO 2 and HfO 2 expressed as weight percentage is 0.01-2%.

4. The composition of claim 1 , further comprising a non-zero amount of ZrO 2 and a non-zero amount of HfO 2 , and a total content of ZrO 2 and HfO 2 expressed as weight percentage is 0.01-2%.

5. The composition of claim 1 , wherein a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.3.

6. The composition of claim 1 , wherein a range of the weight percentage ratio K 2 O/Na 2 O is 1.2-5.

7. The composition of claim 1 , comprising the following components expressed as percentage by weight:

SiO 2

58.5-60.4%;

Al 2 O 3

14.5-16.5%;

CaO

14.1-16.1%;

MgO

    6-8%;

Li 2 O

 0.01-0.4%;

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO 2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.3, and a range of the weight percentage ratio K 2 O/Na 2 O is greater than 1 and less than or equal to 6.

8. The composition of claim 1 , wherein comprising the following components expressed as percentage by weight:

SiO 2

58.5-60.4%;

Al 2 O 3

14.5-16.5%;

CaO

14.1-16.1%;

MgO

    6-8%;

Li 2 O

 0.01-0.4%;

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.14, and a range of the weight percentage ratio K 2 O/Na 2 O is 1.2-5.

9. The composition of claim 8 , wherein a content of Li 2 O expressed as weight percentage is greater than or equal to 0.01% and less than 0.1%.

10. The composition of claim 8 , further comprising at least one of ZrO 2 or HfO 2 , and a total content of ZrO 2 and HfO 2 expressed as weight percentage is 0.01-2%.

11. A glass fiber, wherein the glass fiber is produced from the composition of claim 1 .

12. The glass fiber of claim 11 , wherein the composition further comprises at least one of ZrO 2 or HfO 2 , and a total content of ZrO 2 and HfO 2 expressed as weight percentage is 0.01-2%.

13. The glass fiber of claim 11 , wherein the composition further comprises the following components expressed as percentage by weight:

SiO 2

58.5-60.4%;

Al 2 O 3

14.5-16.5%;

CaO

14.1-16.1%;

MgO

    6-8%;

Li 2 O

 0.01-0.4%;

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO 2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.3, and a range of the weight percentage ratio K 2 O/Na 2 O is greater than 1 and less than or equal to 6.

14. The glass fiber of claim 11 , wherein the composition further comprises the following components expressed as percentage by weight:

SiO 2

58.5-60.4%;

Al 2 O 3

14.5-16.5%;

CaO

14.1-16.1%;

MgO

    6-8%;

Li 2 O

 0.01-0.4%;

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO 2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.14, and a range of the weight percentage ratio K 2 O/Na 2 O is 1.2-5.

15. A composite material, comprising the glass fiber of claim 11 .

16. The composite material of claim 15 , wherein the composition of the glass fiber further comprises at least one of ZrO 2 or HfO 2 , and a total content of ZrO 2 and HfO 2 expressed as weight percentage is 0.01-2%.

17. The composite material of claim 15 , wherein the composition of the glass fiber comprises the following components expressed as percentage by weight:

SiO 2

58.5-60.4%;

Al 2 O 3

14.5-16.5%;

CaO

14.1-16.1%;

MgO

    6-8%;

Li 2 O

 0.01-0.4%;

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.3, and a range of the weight percentage ratio K 2 O/Na 2 O is greater than 1 and less than or equal to 6.

18. The composite material of claim 15 , wherein the composition of the glass fiber comprises the following components expressed as percentage by weight:

SiO 2

58.5-60.4%;

Al 2 O 3

14.5-16.5%;

CaO

14.1-16.1%;

MgO

    6-8%;

Li 2 O

 0.01-0.4%;

Na 2 O + K 2 O

greater than or equal to 0.725% and

less than 1.15%;

K 2 O

greater than 0.5%;

TiO 2

less than 1.5%; and

Fe 2 O 3

less than 1%;

wherein

a range of the weight percentage ratio CaO/MgO is greater than 2 and less than or equal to 2.14, and a range of the weight percentage ratio K 2 O/Na 2 O is 1.2-5.